Re: [SLE] Thinking about 3ware and Raid 1+0 performance

From: Herman Knief (herman_at_knief.net)
Date: 08/29/03

  • Next message: BandiPat: "Re: [SLE] jpg to avi" 
    Date: Thu, 28 Aug 2003 20:27:02 -0700
To: freemyer-ml@NorcrossGroup.com

    Couple of questions: When you built the volumes, did you allow the
    controller enough time to complete it's build process before you began
    running tests? (Especially for the RAID 10) Have you verified the
    version of firmware on the card matches the driver release you are
    running? Are you running this in a 64bit/66MHz slot, 64bit/33MHz or
    32bit/33MHz?

    I've used a number of these in all sorts of configs and always achieved
    the expected results.

     - Herman

    Greg Freemyer wrote:

    >Earlier this week I put a 4-channel 3ware card into a new SuSE box.
    >
    >I set it up as Raid 1+0 with default stripe size.
    >
    >Then I performed the following on 3 different setups:
    >
    >sync; date; dd if=/dev/zero of=target bs=64k count=100000; sync; date
    >
    >There was no other activity on the machines and all had the same
    >motherboard and disk drives (7200rpm ATAs).
    >
    >I tried
    >
    >Pure ATA
    >3-ware Raid 1
    >3-ware Raid 1+0
    >
    >To my great surprise I found pure ATA to be the fastest and Raid 1+0 to
    >be the slowest by far. (30% slower than Raid 1)
    >
    >In particular using iostat -d 10 during the above test I was only
    >getting 15,000 blocks per second being written out. I was expecting
    >50,000 blocks per second.
    >
    >Is there anyone useing 3ware with Raid 1+0 that is getting higher
    >throughput than 15,000?
    >
    >If so, can you give details of your config.
    >
    >Thanks
    >Greg
    >
    >
    >
    >
    >
    > 

    -- 
Check the headers for your unsubscription address
For additional commands send e-mail to suse-linux-e-help@suse.com
Also check the archives at http://lists.suse.com
Please read the FAQs: suse-linux-e-faq@suse.com
  • Next message: BandiPat: "Re: [SLE] jpg to avi"

    Relevant Pages

    • Re: Large Number of Storage Groups
      ... EMC had originally recommended RAID 5 configs for the ... servers and configuring all new servers this way, ... EMC and Microsoft can definetly provide guidance. ...
      (microsoft.public.exchange.admin)
    • Re: Large Number of Storage Groups
      ... EMC had originally recommended RAID 5 configs for the ... servers and configuring all new servers this way, ... eliminating the drive letter challenge. ...
      (microsoft.public.exchange.admin)
    • Re: Raid install
      ... configs and still no luck. ... vista home premium 64 bit. ... A hardware RAID configured via the RAID Controller's BIOS, or a software RAID, configured via a software utility accessed from Vista? ...
      (microsoft.public.windows.vista.installation_setup)
    • Re: Disk Layout on SAN
      ... for more information on RAID configs. ... I would actually recommend that a RAID 0+1 for each SG and Tran Logs, ... recommended for databases ...
      (microsoft.public.exchange.design)
    • [SLE] Thinking about 3ware and Raid 1+0 performance
      ... Earlier this week I put a 4-channel 3ware card into a new SuSE box. ... I set it up as Raid 1+0 with default stripe size. ... To my great surprise I found pure ATA to be the fastest and Raid 1+0 to ...
      (SuSE)