Re: Bad 3ware 9000 performance 5.4?

From: Martin Nilsson (martin_at_gneto.com)
Date: 05/20/05

  • Next message: Steven Hartland: "Re: Bad 3ware 9000 performance 5.4?" 
    Date: Fri, 20 May 2005 07:25:58 +0200
To: Alexis Yushin <alexis@ww.net>

    Alexis Yushin wrote:
    > Hi,
    >
    > Running FreeBSD 5.4... three machines with twe/3ware 8000 and three twa/
    > 3ware 9500-8 controllers. All of them running RAID 1+0 without write cache
    > since we dont have battery backup unit. All of them Seagate 7200 SATA.
    > I get about 46Mb/s write on the 8000 series and only 5(!)MB/s on the 9500 series.

    I have noticed that the MegaRAID SATA cards sometimes disables the write
    cache on Seagate SATA drives, resulting in a write performance of about
    6MB/s. Can you check if the 3ware also does this. I have had arrays were
    only one disk had write cache disabled and it totally ruined the
    performance of the whole array.

    As always be sure to have a good UPS if you are using write cache on the
    disks! With the sad state of todays ATA/SATA disks turning of write
    caching in the drive is often not an option.

    /Martin

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  • Next message: Steven Hartland: "Re: Bad 3ware 9000 performance 5.4?"

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