From: Andrew Walrond <andrew@walrond.org>
To: linux-raid@vger.kernel.org
Subject: Re: Is this hdparm -t output correct? (was Re: RAID1 & 2.6.9 performance problem)
Date: Mon, 17 Jan 2005 17:04:10 +0000 [thread overview]
Message-ID: <200501171704.10374.andrew@walrond.org> (raw)
In-Reply-To: <20050117165133.GC99565@caffreys.strugglers.net>
On Monday 17 January 2005 16:51, Andy Smith wrote:
>
> As an aside, when I try this, how come I get this:
>
> $ sudo hdparm -t /dev/sda /dev/sdb /dev/md0
>
> /dev/sda:
> Timing buffered disk reads: 152 MB in 3.03 seconds = 50.19 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl
> for device
>
> /dev/sdb:
> Timing buffered disk reads: 152 MB in 3.03 seconds = 50.24 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl
> for device
>
> /dev/md0:
> Timing buffered disk reads: read(2097152) returned 524288 bytes
>
> (note warnings about ioctls and no speed output for /dev/md0)
>
> These are SATA drives in a RAID 1.
I edited out the "inappropriate ioctl" warnings in my output. Since the drives
are not partitions, a flush would indeed be inappropriate. hdparm -t only
does read timings anyway. As to why your md0 output is strange - no idea I'm
afraid. :(
Andrew Walrond
next prev parent reply other threads:[~2005-01-17 17:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-17 15:22 RAID1 & 2.6.9 performance problem Janusz Zamecki
2005-01-17 15:39 ` Gordon Henderson
2005-01-17 15:51 ` Hans Kristian Rosbach
2005-01-17 16:46 ` Peter T. Breuer
2005-01-18 13:18 ` Hans Kristian Rosbach
2005-01-18 13:43 ` Peter T. Breuer
2005-01-17 20:49 ` Janusz Zamecki
2005-01-17 16:24 ` Andrew Walrond
2005-01-17 16:51 ` Is this hdparm -t output correct? (was Re: RAID1 & 2.6.9 performance problem) Andy Smith
2005-01-17 17:04 ` Andrew Walrond [this message]
2005-01-17 18:26 ` RAID1 Corruption Markus Gehring
2005-01-17 19:14 ` Paul Clements
2005-01-17 19:35 ` Tony Mantler
2005-01-17 19:42 ` Markus Gehring
2005-01-17 19:21 ` Sven Anders
2005-01-18 17:32 ` RAID1 & 2.6.9 performance problem J. Ryan Earl
2005-01-18 17:34 ` J. Ryan Earl
2005-01-18 18:41 ` Janusz Zamecki
2005-01-18 19:18 ` J. Ryan Earl
2005-01-18 19:34 ` Janusz Zamecki
2005-01-18 19:12 ` Janusz Zamecki
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