porovnanie SSD cache programov vyrobcov a Windowsu

[mp3turbo]

deťúrence, nemate volakto vyskusane porovnanie rozlicnych tych Samsung Rapid a podobnych rezimov a obycajneho zapnutia write cache Windowsu ? Ja som si uz dlhsie skrabal plesinu nad tym ze ako je dokelu mozne take RAPIDne zvysenie cisiel ked vlastne jedina vec co robia softy tychto SSD vyrobcov je proste cache.

Taku istu cache by mal dokazat aj Windows samotny - tam predsa nie je rozdiel. Ba dokonca je, Samsung Rapid je obmedzeny maximalne na 1GB cache, neviem kolko z toho je write a read, ci je dynamicky alokovana alebo co ; pricom Windows cache mechanizmus nema obmedzenu velkost write cache a kludne moze zabrat az celu RAMku cize rozhodne viac ako 1GB.

Nemam k dispozicii take SSDcka kde by som to mohol porovnat, len ma to zacalo zaujimat. Takze otazka : porovnaval uz niekto z vas default Windows cache so zapnutym write mechanizmom pre SSD a programy vyrobcov alebo to este nikoho nenapadlo ?

[shiro]

Skorej by ma zaujimalo, ci toto ma vobec vyznam. Pretoze SSD sa v 98% pouzivaju len na citanie dat., zvy sok su jednorazovky - instalacia OS, hier, programov. Tam ta netrapi, ci zapisujes 200 alebo 550MB/s, pretoze neinstalujes 20 veci kazdy den a nemas ani tak rychlu mechaniku, pripadne platnovy disk, aby si pocitoval brzdenie pri zapise na SSD.

Co som vygooglil, tak u Samsungu pracuje RAPID dynamicky:

RAPID operates at the block and file system
level to analyze application and data usage and
eliminates system performance bottlenecks by
dynamically leveraging system DRAM as a read/
write cache.

Ano, cache moze mat 1GB ci 2GB, v testoch su to pekne cisla, ze zapis 1200MB/s...ale len do tej cache, ktora je vzdy v RAM...z nej to samozrejme lezie max. rychlostou zapisu SSD, takze uzke hrdlo nijak neodstranis, pretoze by si musel mat proste rychlejsi SSD. Cache je len barlicka, beztak to musi dakedy posielat data do SSD, aby sa mohla vyprazdnit. Ked ti vypadne prud, potom co? RAMka je zmazana.

Na SSD maju defaultne v OS vsetci zapnutu windowsacku write cache. Urobil som meranie v sekvecnom zapise na zostave v podpise:
vypnuta windows write cache - zapis 80MB/s
zapnuta windows write cache - zapis 275MB/s

...takze nieco to robi. Disk mam na sata2 radici, preto ta nizka rychlost. Ale rozdiel vidis.

[mp3turbo]

diky za info. Samozrejme ze uzke hrdlo (ehm SSD) neodstranis, ale zaklad cache je v tom aby si :

- pri citani mal potrebne data v ram a tym mnohonasobne urychlil operaciu
- pri zapise zmestil vsetky data do ram a potom na pozadi offloadoval na SSD

jasne, vypadok prudu - nepamatam si nic podstatne za X rokov u mna dozadu, takze tuto statisticku sancu velmi rad obetujem. Ako hovoris, vo write cache aj tak nezvyknem mavat 50GB cize ma to netrapi.

Dynamicka praca Samsung Rapid : samozrejme, myslim ze som niekde cital ze zoberie maximalne 1 GB RAM. Nechce sa mi to teraz verifikovat. Otazka je preco Rapid zvysi vykon este navrch klasickej Windows cache ! Ved predsa keby windows cache fungovala v poriadku, tak "dalsia vrstva" je uz nezmysel. Ci nejaku funkcionalitu "cache ssd" poskytne jeden program alebo druhy program, to by predsa malo byt jedno (windows memory manager alebo samsung rapid). A zjavne to tak nie je.

Si si isty tym ze write cache je standartne zapnuta ? Noze pozri nastavenie SSD v Device manageri, ci tam mas "enable write caching on the device" a "turn off windows write-cache buffer flushing on the device", to su dve rozlicne veci.

Tvoje cisla s vypnutou cache sa mi ani nahodou nepacia : hp probook 6470b, sata1 teda 3Gbit/s, SSD OCZ Vertex4, pouzivany asi rok, 120GB kapacita, 80GB free, sekvencny zapis 270MB/s hocikedy. Zapnuta write cache : mam 8GB RAM, dam si nejakym softom z Microsoftu vytvorit 4GB subor na disku, prebehne okamzite, v Task Manageri vidim ako mi Physical Memory/Cached vyletelo z 300MB po starte systemu na 4400MB takze to zjavne natlacil do cache a potom to radovo 14 az 15 sekund zapisuje na SSD (svieti dioda) cize to presne zodpoveda tomu vykonu co dokazem pozorovat aj nazivo. Vyberem ten disk von, zapojim do desktopu kde mam diskove pole schopne vytlacit az 550MB/s, zapisuje 270MB/s linearne imrvere az do armageddonu.

Plus este si pozri nastavenie BIOSu a Power managementu aj vo Windowse : vykon diskoveho subsystemu ked tam NEMAS zakazane vsetky procesorove C1/C3 sleep state a ked nemas vo Windows maximum performance je dramaticky mensi. Ziadna "balance"... musis mat maximum.

Obrovsky rozdiel je pri praci s malymi blokmi a velkym kvantom suborov. Ked dam vymazat adresar s 15000 fajlikmi bez zapnutej write cache tak sa skoro mozem ist naucit po japonsky ; ked to spravim so zapnutou write cache tak zmiznu za pol sekundu len tak blikne za nimi.


Este moze niekto prispiet so svojimi skusenostami ? Neverim tomu ze system samotny sa proste neda zoptimalizovat tak ako to dokaze Samsung Rapid. Je to proste dalsi prostrednik navyse a ja sprostredkovatelov nevidim rad.

[dexterav]

k tej cache ako to už býva nieje to zase a6 tak o ve2kosti a zrovna Rapid ale patrí do kategorie som veľká ale relatívne hlúpa cache
ani v HDD niesú žiadne GB cache a idú fajne, bez nej sú HDD ozaj slimáci ale stačí 8MB a HDD ide ako blesk, na HDD
nárast výkonu je takmer vždy iba v určitej oblasti veľkosti a potom už je to iba plytvanie...
preto ani HDD nemajú žiadne GB veľkoti cache ale robia to inteligentne
samozrejme to závisí aj čo sa požaduje od samotného zariadenia
ako je cache dobrá ukáže hlavne test ked sú dáta oveľa väčšie ako samotná cache
ak je inteligentná tak výkon je cca na podobnej úrovni resp niesú tam strmé skoky smerom dole, ale ak je to iba o veľkosti po je prekročená proste rýchlosť padne strmo dolu...
samozrejme tá inteligentná cache nieje taká rýchla
btw dobré testy sú na to pri porovnaná iRST od intelu a podobnej veci od marvellu , bavíme sa o SSD cache pre HDD, kde intel ide na to z rozumom ale marvell len proste naťahá dáta do cache (ssd) a hotovo
povedané inak po prekročení veľkosti si intel zachováva relatívne vysoký výkon ale marvell padne proste na výkon HDD
takisto SSD cache od výrobcov SSD sú na tom relatívne dobre , ale to je aj tým že riadenie cache im zabezpečuje všetkým licencovaný soft ktorý všetko riadi

[shiro]

diky za info. Samozrejme ze uzke hrdlo (ehm SSD) neodstranis, ale zaklad cache je v tom aby si :

- pri citani mal potrebne data v ram a tym mnohonasobne urychlil operaciu
- pri zapise zmestil vsetky data do ram a potom na pozadi offloadoval na SSD

Pravda, ale pointa ostava rovnaka - data v tom momente nemas na disku, ale v ram. Ale to by som takto mohol tvrdit o hocijakej cache

Dynamicka praca Samsung Rapid : samozrejme, myslim ze som niekde cital ze zoberie maximalne 1 GB RAM. Nechce sa mi to teraz verifikovat. Otazka je preco Rapid zvysi vykon este navrch klasickej Windows cache ! Ved predsa keby windows cache fungovala v poriadku, tak "dalsia vrstva" je uz nezmysel. Ci nejaku funkcionalitu "cache ssd" poskytne jeden program alebo druhy program, to by predsa malo byt jedno (windows memory manager alebo samsung rapid). A zjavne to tak nie je.

Windows mozno pracuje inym principom, samsung mohol postavit rapid mod presne na mieru svojim diskom a radicu, ktovie.

Si si isty tym ze write cache je standartne zapnuta ? Noze pozri nastavenie SSD v Device manageri, ci tam mas "enable write caching on the device" a "turn off windows write-cache buffer flushing on the device", to su dve rozlicne veci.

Hej mam to tak a na hocijakom pc ktore sme aj vo firme skladali so SSD to bolo zapnute. To "turn off windows write-cache buffer flushing on the device" je vypnutie ochrany pred vypadkom prudu. To mam nezaciarknute, tj. aktivovane. Inac by sa mohlo stat ze ked mi vypadne stava, windows nenbootuju lebo budu mat nejake systemove data v cache a pridu o ne.

Tvoje cisla s vypnutou cache sa mi ani nahodou nepacia : hp probook 6470b, sata1 teda 3Gbit/s, SSD OCZ Vertex4, pouzivany asi rok, 120GB kapacita, 80GB free, sekvencny zapis 270MB/s hocikedy. Zapnuta write cache : mam 8GB RAM, dam si nejakym softom z Microsoftu vytvorit 4GB subor na disku, prebehne okamzite, v Task Manageri vidim ako mi Physical Memory/Cached vyletelo z 300MB po starte systemu na 4400MB takze to zjavne natlacil do cache a potom to radovo 14 az 15 sekund zapisuje na SSD (svieti dioda) cize to presne zodpoveda tomu vykonu co dokazem pozorovat aj nazivo. Vyberem ten disk von, zapojim do desktopu kde mam diskove pole schopne vytlacit az 550MB/s, zapisuje 270MB/s linearne imrvere az do armageddonu.

OCZ maju iny radic ako samsung, tam vidim rozdiel. Toto je neporovnatelne, porovnavame jablka a hrusky.

Plus este si pozri nastavenie BIOSu a Power managementu aj vo Windowse : vykon diskoveho subsystemu ked tam NEMAS zakazane vsetky procesorove C1/C3 sleep state a ked nemas vo Windows maximum performance je dramaticky mensi. Ziadna "balance"... musis mat maximum.

To by ma zaujimalo ze preco...sleep staty nemaju co robit s vykonom disku...okrem pripadu uspania pc a podobnych veci.
Mam to na balance, to je pravda. Zase nepotrebujem aby mi cely cas bezal cpu na plno a zbytocne sa opekal.

Obrovsky rozdiel je pri praci s malymi blokmi a velkym kvantom suborov. Ked dam vymazat adresar s 15000 fajlikmi bez zapnutej write cache tak sa skoro mozem ist naucit po japonsky ; ked to spravim so zapnutou write cache tak zmiznu za pol sekundu len tak blikne za nimi.

Lebo bez zapnutej cache to maze priamo na disku, kdezto pri zapnutej si to spravi daco ako "frontu" a ostatok uz nevidis. Javi sa ti to ako ihned zmazane.

Este moze niekto prispiet so svojimi skusenostami ? Neverim tomu ze system samotny sa proste neda zoptimalizovat tak ako to dokaze Samsung Rapid. Je to proste dalsi prostrednik navyse a ja sprostredkovatelov nevidim rad.[/quote]

[mp3turbo]

budem reagovat len na tvoje vety, reakcia na co si reagoval ty je jasna z prispevku vyssie :

>> Pravda, ale pointa ostava rovnaka - data v tom momente nemas na disku, ale v ram. Ale to by som takto mohol tvrdit o hocijakej cache

isteze, ja som len nahrubo popisal moje myslienky co cache robi a/alebo by mala robit. Samozrejme ze akakolvek cache, tak ako ty hovoris, by toto popisane mala splnat a teda by sme to o nej mohli tvrdit.





>> Windows mozno pracuje inym principom, samsung mohol postavit rapid mod presne na mieru svojim diskom a radicu, ktovie.

to prve zrejme ano, to druhe urcite nie. Rapid postavil na mieru svojim diskom, ale absolutne nic nezmenia na chipsete ktorym je Samsung SSD pripojeny, na jeho vlastnostiach a radic na SSDcku do tohoto absolutne nema co kecat - tu sa jedna o optimalizaciu v pamati. Zapis na disk nevyriesia nijako inak, to je proste pevne dane.





>> To "turn off windows write-cache buffer flushing on the device" je vypnutie ochrany pred vypadkom prudu. To mam nezaciarknute, tj. aktivovane.
>> Inac by sa mohlo stat ze ked mi vypadne stava, windows nenbootuju lebo budu mat nejake systemove data v cache a pridu o ne.

Tato vec je z principu len "vynutenie flashnutia cache vnutri v SSDcku na medium s potvrdenim toho ze to SSD spravilo" co dnesne disky skoro kazdy jeden zabezpecuju s prstom v riti tak, ze proste maju vlastny kondenzator. Vypadne prud, to co ma SSD vo svojej cache to dokaze s garanciou zapisat [poznamka autora : co do SSD Cache nestihlo prist z hlavnej cache teda RAM je ajtak stratene bez debaty cize tymto smerom sa nemusime uberat].

Cize tento parameter ta moze vyslovene len spomalit - nemozes nic ziskat (KED MAS SSD S KONDIKOM), jedine stracas. Preto som sa ta pytal ci to mas zapnute alebo nie.






>> OCZ maju iny radic ako samsung, tam vidim rozdiel. Toto je neporovnatelne, porovnavame jablka a hrusky.

spravne, ale co som ja hovoril nebolo o porovnani radicov ale o tom ako mi pracuje standartna windows cache. A ze nevidim priestor pre lepsi vysledok ked sa do hry zapoji este Samsungova Rapid. Ja viem ze ludia maju lepsie vysledky s Rapidom ako bez neho, ale takychto programov existuje sialene vela a vsetky robia to iste ako Rapid, akurat su daleko-predaleko viac konfigurovatelne a dokazu vyuzit viac ako 1GB RAM, ako prve ma napadlo Velobit HyperCache alebo Romex FancyCache (review tu : http://www.thessdreview.com/our-reviews ... onds-flat/ )

Toto je presne to ako pracuje aj Samsung Rapid, radic SSDcka do toho nepletieme. Akurat hovorim Rapid je velmi obmedzeny. A ja sa pytam to co sa pytam : preco dofrasa ten posrany Windows nevie pracovat rovnako zaujimavo ako FancyCache a Rapid ? Podla mna to musi byt schopny, proste princip je ten isty, len si myslim ze nieco robime zle a preto do toho vrtam.






>> To by ma zaujimalo ze preco...sleep staty nemaju co robit s vykonom disku...okrem pripadu uspania pc a podobnych veci.

este si malo mliecka spapal a to nemyslim vobec v zlom tak to tak neber :
http://blogs.msdn.com/b/cindygross/arch ... erver.aspx
http://www.brentozar.com/archive/2010/1 ... t-so-fast/
http://www.mssqltips.com/sqlservertip/2 ... anagement/
http://www.hanselman.com/blog/TheNewTur ... rvers.aspx
http://serverfault.com/questions/94212/ ... erformance

a to som zobral len odkazy z prvej stranky googla. Takze toto maju sleep staty co robit s vykonom disku. Rovnake veci som pozoroval aj ja u mna doma a to pri klasickom testovani rychlosti diskov, ziadne DB/SQL.






>> Lebo bez zapnutej cache to maze priamo na disku, kdezto pri zapnutej si to spravi daco ako "frontu" a ostatok uz nevidis. Javi sa ti to ako ihned zmazane.

tajomstvo pri mazani suborov je v opakovanom prepisovani alokacnej tabulky na surobovom systeme, kde vykonas operaciu stokrat v pamati ale na disk zapises iba raz pri zapnutej cache. Takze nie fronta, ale toto. Sikovna cache jednoducho vidi ze "tuto nebudem zapisovat data pretoze sa mi uz medzicasom stihli zmenit zase".



Vidim ze nejako vela ludi nesprta do veci do ktorych sprtam ja. Ach jo skoda. Ja mam systemy produkcne a nemozem si dovolit hracickovat sa - nemate niekto naladu napriklad si natiahnut tu FancyCache a porovnat to s Rapidom samsungu ? Ze by sme sa dopracovali k nejakemu prekvapeniu ja nemam doma ziadne SSD co mozem pouzit a nemam ziadny Samsung takze to porovnat nedokazem.

[Zoltan Balaton]

Skorej by ma zaujimalo, ci toto ma vobec vyznam. Pretoze SSD sa v 98% pouzivaju len na citanie dat., zvy sok su jednorazovky - instalacia OS, hier, programov.

fiha..a page file ?..

[mp3turbo]

skoda ze sa nikto nechytil.

[Vlko]

Mno ked chcete zistit dačo viac o Rapid mode tak odporúčam pozreť tento FAQ, je tam vysvetlene vela vecí na ktore sa tu pýtate, napríklad aj to ako sa lisi od RAMDisku, či Windows write cache + ako spoluupracuju, ako to cele funguje, prečo to nejde na inom SSD a vela, vela viac. Cize dačo pre teba mp3turbo

Mne osobne sa pači hlavne, fakt že momentálna velkosť 1Gb je len sučasné nastavenie vyrobcom, ktore je vraj moc konzervativne a sa ho chystaju prehodnotit. Potom by sa konecne našlo využitie aj pre 16 či 32GB RAM v bežnom PC.

Samsung RAPID mode - FAQ

Spoiler: ukázať

1) What is RAPID mode?
RAPID mode from Samsung increases the overall performance of your computer by pairing the industry’s most
advanced SSD with cutting-edge storage management techniques to deliver the fastest and most reliable user
experience.
RAPID mode is installed as a filter driver in the Windows storage stack. The RAPID mode technology analyzes
system traffic to the Samsung SSD and leverages excess system resources (unused DRAM, CPU cycles) to deliver
optimized write I/Os to the SSD and caching hot data for improved responsiveness based on frequency, recency,
file type, etc.
RAPID mode is available as a part of the Samsung SSD Magician Software Toolset.
2) What are the key features of
RAPID?
Read/Write Cache. RAPID mode uses system DRAM as a cache of “hot data” based on frequency, recency, file
type, etc, such that subsequent requests can be served directly from DRAM, rather than going to the SSD.
Write Optimization. System write requests are processed for optimized performance with Samsung EVO SSD.
File Awareness. RAPID mode may exclude certain files from caching based on a variety of factors, including file
type, file size, etc. This prevents unnecessary data from polluting the cache.
Persistent Cache. RAPID mode maintains cache map across system reboot to maintain consistent highperformance
operation.
Cache Compression. RAPID mode dynamically compresses and de-compresses cache contents to dramatically
improve cache efficiency. Optimized for Samsung EVO. RAPID Mode was co-developed and optimized for the
Samsung MEX controller.
3) What are the key benefits of
RAPID mode?
Highest Performance. RAPID mode operates at the block and filesystem level to analyze application and data
usage and eliminate system performance bottlenecks by dynamically leveraging system DRAM as a read/write
cache.
Easy Installation, Fully Automated. The software is fully automated, installed via Samsung SSD Magician;
no user management is necessary.
4) What happens when my
applications require more
memory?
RAPID mode will release and re-acquire system resources seamlessly based on system activity and requirements.
RAPID mode consumes at most 25% of the installed DRAM, up to a maximum of 1GB.
5) Does RAPID mode keep its
improvement across system
reboot?
RAPID mode maintains its cache across reboots.
NOTE: RAPID mode was not designed to improve boot performance. In fact, RAPID mode does not go into effect
until the system is quiescent (about 60 seconds). This is because the system and/or user may try to launch some
applications at boot up so the system may already be under stress, so we intentionally delay RAPID activity to avoid
interference with the user’s boot sequence.
6) How does EVO compare with and
without RAPID?
Samsung EVO is the industry’s highest performing SSD solution across all dimensions of measure (sequential/
random read/write, longevity, cost, etc). RAPID mode extends Samsung’s advantages by leveraging spare system
resources to provide even more performance, especially for random requests with low queue depths and smaller
data sizes.
7) Why did Samsung develop
RAPID mode?
Samsung believes that future advancements in storage technology will come from both device-side inventions
as well as host-side software innovation. RAPID mode is the first step in a family of new technologies under
development and investigation from the team at Samsung.
8) What user scenarios are most
improved with RAPID mode?
RAPID mode will provide performance improvements across the board. Most noticeable will be small random write
performance, access to frequently-used data, and overall system responsiveness.
NOTE: although some sequential accesses are accelerated by RAPID mode, the technology is not intended to
accelerate large sustained reads/writes.
9) Is RAPID mode used to mask
Samsung EVO problems?
Absolutely not. Samsung EVO is the most advanced SSD on the market. RAPID mode simply augments the already
excellent performance of EVO by leveraging spare system resources to further accelerate the storage interface.
10) What are the system
requirements to use RAPID mode?
RAPID mode requires the following –
1) Window7 or Window 8 (32- or 64-bit)
2) 2GB DRAM (minimum)
3) Samsung 840 EVO SSD
11) Why not let advanced users
allocate more than 1GB of RAM to
RAPID mode?
This is a fairly conservative setting, in order to provide a nice performance boost with minimal cost, to a broad range
of users. Obviously, if RAPID mode allocated a larger amount of memory, we would be able to provide even more
acceleration and sustained performance across larger workloads, but we decided to stick to a max of 1GB as our
initial setting until we have further characterized performance across more systems and users. We are keeping our
eyes/ears open for your feedback, so could potentially change this setting in a future release, if it looks like we are
being too conservative.
12) Can RAPID mode be used with
other SSD?
Currently, RAPID mode is only supported with and optimized for Samsung 840 EVO SSD. Future versions of RAPID
mode will be backwards compatible with selected Samsung SSDs, including 840 Pro.
13) What is the difference between
the 1GB cache on-board with the
SSD and the cache in RAPID mode?
The onboard LPDDR RAM cache is used by the SSD controller for block management and wear-leveling purposes
and SSD mapping table.
14) What is the difference between
the 3GB (or more) TurboWrite cache
and the RAPID mode cache?
RAPID mode and TurboWrite work hand-in-hand to optimize write performance for the SSD. Since RAPID mode
operates at the block and filesystem level, it can provide awareness of how the data should be stored and retrieved.
RAPID mode then coalesces and optimizes write I/O at the host for TurboWrite. TurboWrite acts as a large SLC
buffer for incoming writes. In the background, TurboWrite will transfer user data from the buffer to primary storage.
15) What are the typical
performance results with RAPID
mode?
Since RAPID mode utilizes spare CPU cycles and DRAM capacity, together with Samsung 840 EVO SSD, to deliver
improved system level performance, measured performance (via benchmarks, user scenarios) will vary depending
on all the above factors.
For our benchmark system, with Z77 platform, Core i7 CPU, 8GB DRAM, and 240GB 840 EVO SSD attached and
accelerated by RAPID as a secondary drive has shown the following performance results in Crystal Disk Mark
(no other applications running) –
Seq RD = 774 MB/s, WR = 1133 MB/s, 512K RD = 1102 MB/s, WR = 971.4 MB/s 4KQD1 RD = 106.8 MB/s,
WR = 445.0 MB/s 4KQD32 RD = 484.2 MB/s, WR = 447.2 MB/s
16) What does RAPID mode write
optimization entail?
RAPID write-optimization consists of a number of features to improve write (and subsequent read) performance.
One of the features we described was our ability to maintain higher queue depths.
17) When writes are flushed from
the RAPID mode cache, are they
treated as a normal writes and
funnelled through TurboWrite, or
do they go directly to the TLC?
Writes flushed from RAPID are treated as normal writes; they go directly to the TurboWrite buffer.
18) Is there any risk to using
RAPID mode?
RAPID was specifically designed to not add any additional risk to user or system data, even in the event of a powerloss.
In fact, RAPID strictly adheres to Windows conventions in its treatment of any buffered writes in DRAM --
RAPID obeys all “flush” commands, so any writes buffered by RAPID will make it to the persistent media just like the
Windows OS cache or the HDD cache. (Consequently, the data loss risk is identical to that of Windows OS cache or
HDD cache)
19) How does RAPID mode
compare to Ramdisk?
A Ramdisk is a solution which creates a temporary storage device using a fixed amount of system DRAM. Ramdisk
will often compete with other applications for DRAM. The Ramdisk contents are lost after a power-loss. Ramdisk
content needs to be actively managed by the user (copy, delete, rebuild). Eventually, all data needs to be written to
the SSD for data integrity reasons.
20) How does RAPID mode
compare to SuperFetch?
Superfetch is an important Windows feature which preloads certain frequently used applications into DRAM to
improve initial program launch. RAPID is different in that it caches both application files as well as frequently used
user data. RAPID also caches both read and write I/O.
21) How does RAPID mode
compare to Windows DRAM cache?
Windows DRAM cache will store recently used data in the DRAM cache in anticipation of quick reuse by the user. For
example, if a user opens a document, then wants to reopen the document again shortly later. The DRAM cache is
only active per-session, so it is not retained across reboots like RAPID mode is.
SAMSUNG CONFIDENTIAL

ZDROJ
http://www.samsung.com/global/business/ ... epaper.pdf

Toto je fajna poznámka

Is RAPID mode used to mask
Samsung EVO problems?
Absolutely not. Samsung EVO is the most advanced SSD on the market. RAPID mode simply augments the already
excellent performance of EVO by leveraging spare system resources to further accelerate the storage interface

[mp3turbo]

toto su len marketingove drysty a nic technicke.


>> je tam vysvetlene vela vecí na ktore sa tu pýtate, napríklad aj to ako sa lisi od RAMDisku

ja som sa nepytal ako sa lisi od ramdisku, to je hadam jasne kazdemu co ma v zadku dierku ; nie je tam vysvetlena ani jedna jedina vec na ktoru som sa pytal.

Myslel som to skor na takejto nejakej urovni : http://www.microsoft.com/en-us/download ... x?id=41182
pozri si nieco z tych par tisic stran...

hlavne som sa pytal na prakticke porovnanie s inymi cache programami a konkretnym nastavenim vo Windowse, ale vidim ze nikto realne skusenosti nema. Ani ja, pretoze Samsung SSD nemam doma a teda nemozem porovnat vlastnymi silami, inak by som sa nespoliehal na inych. Tak potom ine zadanie :

ked niekto budete kupovat SSD, boli by ste taki laskavi ze by ste si nainstalovali windows, natiahli na neho dole spominany pridavny cache program Velobit HyperCache alebo Romex FancyCache a spravili hentie "vykonove" testy teda Atto and company ? Velmi rad by som taketo vysledky porovnal s vysledkami co dosahuje Samsung Rapid. Vobec ma netrapi ze by to bol uplne iny model SSD a nie od Samsungu, proste by som len chcel porovnat cisla .... Samsung Rapid versus FancyCache/Hypercache. Proste ma to zaujima. Zase by som si pomohol sam, ale nove SSD sa nechystam kupovat v blizkej dobe. Som presvedceny ze taketo porovnanie by zaujimalo viacerych.

[mp3turbo]

a vlastne... co sa pytam tak sproste, ved uz linkovany test: http://www.thessdreview.com/our-reviews ... ds-flat/2/

to ukazuje uplne jasne. S jedinym SSD, 120GB Mushkin Chronos Deluxe, dosahuju cisla ktore su na miliardy galaxii vzdialene cislam co prezentuje Samsung Rapid s "the most advanced SSD" ako prehlasili o EVO.

Vyriesene, Samsung Rapid je hnacka podla ocakavania, na hlavu ho porazi sprosta utilitka v beta verzii od totalne neznamej zaprdenej dvojchlapovej (aby som nahodou neprehnal !) firmy. Nic ine som ani necakal, samozrejme.

Cele som to len chcel vidiet na obrovskych suboroch, mnohodesiatok gigabajtov a nie na takychto priblblych testikoch co trvaju desat sekund. Ja viem, co si nespravim sam, to nemam.

[Vlko]

Jasne, že to je hračka, čo si konkretne čakal? Sak to je čisty marketing pre decka Pre mna napríklad je to len bonus, ssd to podporuje, RAMky dosť, tak prečo nie.

Cele som to len chcel vidiet na obrovskych suboroch, mnohodesiatok gigabajtov a nie na takychto priblblych testikoch co trvaju desat sekund.

Jo, mno taketo niečo určite nebudem riesit na 120-240GB low-cost ssd a myslim, že ani bezny uzivatel na domacom pc. Inak super že podobne utilitky ficia, aspon každy može okúsiť tu "rýchlosť".