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[linux-lvm] Re: [PATCH] 64 bit scsi read/write

From: Alan Cox <alan lxorguk ukuu org uk>
To: cw f00f org (Chris Wedgwood)
Cc: phillips bonn-fries net (Daniel Phillips),alan lxorguk ukuu org uk (Alan Cox), andrewm uow edu au (Andrew Morton),adilger turbolinux com (Andreas Dilger),acahalan cs uml edu (Albert D. Cahalan), bcrl redhat com (Ben LaHaise),kernel ragnark vestdata no (Ragnar Kjxrstad),linux-fsdevel vger kernel org, linux-kernel vger kernel org,mike bigstorage com, kevin bigstorage com, linux-lvm sistina com
Subject: [linux-lvm] Re: [PATCH] 64 bit scsi read/write
Date: Sun, 15 Jul 2001 16:32:59 +0100 (BST)

> I only have SCSI disks to test with, but they are hot-plug, so I guess
> I can write a whole bunch of blocks with different numbers on them,
> all over the disk, if I can figure out how to place SCSI barriers and
> then pull the drive and see what gives?

Another way is to time

	write block
	write barrier
	write same block
	write barrier
	repeat

If the write barrier is working you should be able to measure the drive rpm 8)

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