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Thread: LSI Megaraid and LSI cachecade 2 Pro

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  1. #1

    Default LSI Megaraid and LSI cachecade 2 Pro

    I know that LSI megaraid cards are well supported in Open-E, but how about LSI ssd caching called LSI Cachecade 2 ? Is it working well with Open-E ?

  2. #2

    Default

    We have done some tests with the LSI CacheCade - see link below.

    http://blog.open-e.com/what-you-can-expect-from-ssd-2/
    All the best,

    Todd Maxwell


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  3. #3

    Default

    So, it works out-of-box ?

  4. #4
    Join Date
    Jun 2009
    Location
    London
    Posts
    16

    Default

    It would be nice to test:
    1) RAID 5 with 12* SAS 15K
    2) RAID 5 with 12* SAS 15K +1 * INTEL X25-M SATA SSD 120GB (with Cache Cade software)

    this would allow one to measure the boost of a Cache Cade solution.

    On a Cache Cade - I believe that this is feature of a firmware and it's OS agnostic - it's LSI card that decides which data goes where (hot - SSD, cold - HDD). So as long as your OS has got driver for particular a card you should be fine.

  5. #5
    Join Date
    Feb 2009
    Posts
    142

    Default

    Sorry to revive an old thread but curious as to whether anyone has implemented this. We are considering this combo (LSI and Cachcade) but have no experience with LSI or Cachecade.

    I read all the stuff in the knowledgebase including the tests and have read all kinds of reports on the Internet about the performance benefits, just want to hear from someone that has successfully implemented LSI and Cachecade in a production DSS V6 system (not test environment).

    I need real live experience and not opinions and conjecture. About to pull the trigger on buying all this hardware (cards, bbu,cachcade x 2) and its expensive for a small shop like mine.

    Don't want to make a horrible mistake if this does not work well or reliably.

    Thanks!!

  6. #6

    Default

    We did try the CacheCade Pro 2.0 software with a single SSD drive, and 6 - SAS 600GB 6Ggb 15K Raid 10. The SSD became a bottleneck for the drives. I think if we had more SSD's in a Raid 0 config it would have worked better. We are getting about 600MBps read so we are content with not turning on the SSD again.

    Thanks
    Shawn

  7. #7
    Join Date
    Feb 2009
    Posts
    142

    Default

    What brand of SSD drive did you use? Can the Cachecade be used just for reading or is it always on in read/write mode when its being used?

    Thanks!

  8. #8
    Join Date
    Oct 2007
    Location
    Toronto, Canada
    Posts
    108

    Default

    Quote Originally Posted by webguyz
    What brand of SSD drive did you use? Can the Cachecade be used just for reading or is it always on in read/write mode when its being used?
    In order to be used as a read cache data must be written to the SSD.

    The card/software decides what blocks are used most often and writes those to disk first, then to the cache. (So, if the SSD fails, no data is lost)

  9. #9

    Default

    Quote Originally Posted by webguyz
    What brand of SSD drive did you use? Can the Cachecade be used just for reading or is it always on in read/write mode when its being used?

    Thanks!
    It is a Intel SSD SC2MH12. I don't know if you can set it up to only read, I know in the old version of CacheCade it could only be used for reads.

    Thanks
    Shawn

  10. #10
    Join Date
    Nov 2009
    Posts
    53

    Default

    Quote Originally Posted by shawngrass
    We did try the CacheCade Pro 2.0 software with a single SSD drive, and 6 - SAS 600GB 6Ggb 15K Raid 10. The SSD became a bottleneck for the drives. I think if we had more SSD's in a Raid 0 config it would have worked better. We are getting about 600MBps read so we are content with not turning on the SSD again.

    Thanks
    Shawn
    Thats interesting. I wonder why the SSD became the bottleneck? Sure, one SSD could be a bottleneck if you copying or transferring big files compared to 6x600GB 6GBs disks.
    But isn't it related to the requirements?
    So I guess its better to use cacheCade or Maxcache (from Adaptec) if youre expecting lots of IO's and not big bandwith?
    Please correct me if my expectations regarding SSD caching are wrong!

    I am interested in for what kind of environment you used the SSD for caching? (e.g. what kind of servers etc.)
    Maybe thats the reason why youre cachecade situation doesnt meet your needs?

    Unfortunately I cant give you any feedback cause we do not use cachecade or maxcache in a productive environment, so I am just interested.
    Thanks.

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