Very slow writing to SATA disk

From: Mikhail T. (mi_at_aldan.algebra.com)
Date: 10/28/05

  • Next message: Sergey Babkin: "Re: Re: how to make the FreeBSD 6.0 run faster" 
    To: hardware@FreeBSD.org, hackers@FreeBSD.org
Date: Fri, 28 Oct 2005 01:18:03 -0400 (EDT)

    Hi!

    I've got a new Hitachi drive with 16Mb of cache:

            ad8: 476940MB <HDS725050KLA360 K2AOA11A> at ata4-master SATA150

    and am trying to use it to store backups online. Unfortunately, writing
    to the disk is painfully slow (by today's standards) -- it can barely
    keep 7Mb/second and my other (SCSI) disks run circles around it.

    I tried to just cp a huge file from a SCSI disk to this one -- without
    any other activity. 7Mb/second is the best it could do :-(

    For bulk writing, undisturbed by other access, I'd expect at least
    30Mb/sec... Is it the drive, the controller:

            atapci1: <SiI 3114 SATA150 controller> port 0xac00-0xac07,0xa480-0xa483,0xa400-0xa407,0xa080-0xa083,0xa000-0xa00f mem 0xbe6fbc00-0xbe6fbfff irq 25 at device 5.0 on pci3

    the driver (6.0/amd64), or a misconfiguration of some sort?

    According to smartctl, the drive runs at 56C during the copying. Its
    idle temperature seems to be 54C.

    Thanks for any hints!

            -mi
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  • Next message: Sergey Babkin: "Re: Re: how to make the FreeBSD 6.0 run faster"

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