Date: Fri, 28 Oct 2005 19:48:44 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: "Mikhail T." <mi@aldan.algebra.com> Cc: hackers@freebsd.org, hardware@freebsd.org, sos@freebsd.org Subject: Re: Very slow writing to SATA disk Message-ID: <20051028094844.GU39882@cirb503493.alcatel.com.au> In-Reply-To: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net> References: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net>
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On Fri, 2005-Oct-28 01:18:03 -0400, Mikhail T. wrote: >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. If this drive doesn't support tagged-queueing, is the write cache disabled? I get that sort of performance from a (PATA) disk with the cache disabled (hw.ata.wc="0" in loader.conf) >According to smartctl, the drive runs at 56C during the copying. Its >idle temperature seems to be 54C. I'd double-check that (eg with a finger). If the drive really is running at 56°C, it won't last very long. -- Peter Jeremy
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