Slow disk performance on new setup

Discussion in 'SSDs & Data Storage' started by takeawaydave, Jan 14, 2014.

  1. takeawaydave

    takeawaydave n00b

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    Hi - I am very "green" when it comes to RAID and SSD's.... recently put together a new machine which runs Intel 5500 with a dual Intel X5660 Xeons. I have also put in a RAID card M1015 and flashed it to LSI 9211 IR mode.

    I hooked up a new Samsung 840 Pro 128GB SSD (MZ-7PD128BW) and built a virtual disk consisting of this single drive.

    I have installed Windows 8 (to do some bench marking) and quickly have come to realize I am looking at pretty lousy Read/Write speeds - I am using CrystalDiskMark latest version 3.03 and this is telling me I am getting sequential read speed 155 MB/s and write speed 133.7 MB/s. Now I know that this setup is cable of more.

    Definitely still learning the ropes when it comes to it but I suspect I have configured the virtual disk incorrectly.

    Running MegaRAID Storage Manager I see that

    CacheCase SSD caching is disabled - not sure if this should be or not....
    Drive Speed is 6.0 Gbps -- good
    Disk cache policy is disabled
    read policy - no read ahead
    IO policy - direct io

    Any body got any advice as to how to improve things ?
     
  2. Old Hippie

    Old Hippie [H]ardness Supreme

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    RAID with a single drive?
     
  3. cyclone3d

    cyclone3d [H]ardForum Junkie

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    Running MegaRAID Storage Manager I see that

    CacheCase SSD caching is disabled - This is for when you are using an SSD as a cache for a HDD array - no point in enabling.
    Drive Speed is 6.0 Gbps -- good
    Disk cache policy is disabled - if your RAID card has RAM, definitely enable this. Depending on the card you may want to enable this even if your RAID card doesn't have RAM. If it is disabled, it may not let the OS do any kind of cacheing for your drive.
    read policy - no read ahead - enable this.
    IO policy - direct io

    As it is, there is almost no point in using a RAID card with a single SSD unless you have one with RAM cache.
     
  4. takeawaydave

    takeawaydave n00b

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    Thanks for the replies. Yes I know bit lame a single disk - whole project is still a bit of work in progress....

    I enabled the disk cache policy and reads are looking better:

    Disk cache policy OFF:
    [​IMG]
    Disk cache policy ON:
    [​IMG]

    As for writes is this degradation in performance explainable by turning disk cache policy on ?


    Regarding the read ahead there doesn't appear to be any other option than "No Read Ahead".

    Or am I missing something?

    I plan to buy a second drive soon and setup a RAID 10 array.
     
  5. drescherjm

    drescherjm [H]ardForum Junkie

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    You would need four drives minimum for raid 10.
     
  6. takeawaydave

    takeawaydave n00b

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    whoops showed my noobishness again :eek:
     
  7. drescherjm

    drescherjm [H]ardForum Junkie

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    I assume you want to do raid 0 with just 2 drives.
     
  8. takeawaydave

    takeawaydave n00b

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    yes RAID 0 would I expect improve read performance.

    Some what worried though about how to get the write figure improved. I think I read that Raid 0 doesn't improve write speeds... I could well be wrong again though

    [​IMG]

    :(
     
  9. drescherjm

    drescherjm [H]ardForum Junkie

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    RAID0 with SSDs does not improve performance that much with real world desktop applications however it will help in specific applications that read or write files in very large chunks or on systems with high queue depths like servers.


    Your benchmark numbers are all bad. I would try using the intel ports instead.
     
  10. MysticRyuujin

    MysticRyuujin Limp Gawd

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    Does your motherboard not have built in RAID?
     
  11. Jorona

    Jorona 2[H]4U

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    Why is the partition your doing the tests on only 47gb, It's a 128gb SSD right?

    Does the M1015 pass Trim in Raid? Can you set it up in JBOD?
     
  12. Old Hippie

    Old Hippie [H]ardness Supreme

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    Of course it does.

    But here's the deal, you're trying to make a silk purse out of a cow's ear......

    1. The smaller the SSD the slower it is and yours is small.
    2. The LSI 9211 is an entry level card and won't ever give decent RAID0 performance.
    3. Forget the card, hook your SSD to the Intel ports and when/if you get another SSD use Intel's RAID.

    4. Use Google to find articles on RAID configurations (there's a zillon of 'um) and get a little education.

    Good Luck!
     
  13. AndreRio

    AndreRio [H]ard|Gawd

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    i bought some special rounded sata cables and i was getting very low score on as ssd. i did lots of things and nothing. the only thing left was to try the "ordinary" cables that came with my motherboard. my score jumped to more than 1000 points in as ssd benchmark. go figure.
     
  14. Old Hippie

    Old Hippie [H]ardness Supreme

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    LOL!