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SSD Cache

SSD Cache

key900key900 Member
edited August 2012 in General

Hello,

I'm looking to use SSD cache, Some Hardware seller procide me LSI MegaRAID 9265-8i if planing use SSD cache and some other provide normal 3ware 9750-4i

So i'm very Confused now i don't know who is right.

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Comments

  • johnjohn Member

    The 3ware 9750-4i is basically the 3ware version of the LSI 9260-4i. The 9265 has a dual core chip compared to the 9260's single core.

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  • Hello,

    Then how i"d using SSD cache?

    I need to know how is?

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  • johnjohn Member

    LSI's caching solution is called CacheCade.

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  • You can also use a software solution, using any onboard SATA controllers your motherboard may have:

    https://github.com/facebook/flashcache/

    I am no longer affiliated with IPXcore.
  • @Damian said: You can also use a software solution, using any onboard SATA controllers your motherboard may have:

    https://github.com/facebook/flashcache/

    I am about to test flashcache on a local server. Need to get a SSD only .. And will post results.

    Disclosure: I work for Query Foundry LLC.
    I own DA International Group Ltd.
  • I tried facebook's flashcache on a test machine and am not too impressed. It does help some benchmarks but i am not sure how much benefit there will be with real production load. I think there is certainly room for improvement, software wise in the facebook's flashcache module. Unfortunately i don't have the time nor am i brave enough to make my own changes in the caching algorithm and test them,

  • @miTgiB is using SSD Caching pretty successfully on his newer nodes, he might not give away his secrets but here's the results:

    dd if=/dev/zero of=sb-io-test bs=1M count=1k conv=fdatasync
    1.96858 s, 545 MB/s

    That's on the OVZ-256 in his Charlotte DC.

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  • miTgiBmiTgiB Member
    edited August 2012

    @serverbear said: That's on the OVZ-256 in his Charlotte DC.

    I have no nodes with SSD caching in Charlotte, only in LA, e3la17 and e5la18, and here is a test I did to show off the cache in action http://www.lowendbox.com/blog/review-hostigation-256-mb-openvz-monthly/#comment-77074

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  • so... @miTgiB is secretly a super secret computer hacker using a GUI interface in Visual Basics?

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  • @miTgiB said: I have no nodes with SSD caching in Charlotte

    Hrm, that's pretty solid IO to not be using SSD's. Black magic? :P

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  • @serverbear said: Black magic?

    The e5clt19 node was my test system when I was thinking of changing from E3's to E5's and totally over spent on it, so it is just a real beast.

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  • @key12 said: I'm looking to use SSD cache, Some Hardware seller procide me LSI MegaRAID 9265-8i if planing use SSD cache and some other provide normal 3ware 9750-4i

    How many drives total?

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  • Woah. Seen the comment from LEB that @miTgiB pointed out. Real beast 900 mb/s. Awesome result!

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  • Oh my god, this is awesome result.

    What SSD card did you use and on what configuration of drives? And was this software solution like the one posted above (facebook flashcache, etc.)? @miTgiB

    Disclosure: I work for Query Foundry LLC.
    I own DA International Group Ltd.
  • I don't want to rain on Tim's parade so i will not tell you what the 900MB/s result means :)

  • AlexBarakovAlexBarakov Member
    edited August 2012

    @rds100 said: I don't want to rain on Tim's parade so i will not tell you what the 900MB/s result means :)

    Go ahead .. ;d

    I am not hoping in achieving 900MB/s, however if I can increase the IO from 150MB/s to 200MB/s, it is still great.

    Disclosure: I work for Query Foundry LLC.
    I own DA International Group Ltd.
  • There is no (SATA) ssd that can read at 900MB/s. This read is probably coming from RAM (he did not do echo 1 > /proc/sys/vm/drop_caches between the tests)

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  • @rds100 said: (he did not do echo 1 > /proc/sys/vm/drop_caches between the tests)

    Damit, I got all excited once before with my first 6g raid card and didn't test larger than it's cache either. Finding good overall benchmarks is like snipe hunting, but tossing a WP site on a node that is trashing others without the cache and seeing it breeze along is test enough for me.

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