From: Phillip Susi <psusi@cfl.rr.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: Error target causes entire device to error
Date: Thu, 13 Nov 2008 14:43:02 -0500 [thread overview]
Message-ID: <491C8346.3050301@cfl.rr.com> (raw)
In-Reply-To: <491C743A.9060609@redhat.com>
Milan Broz wrote:
> it seems that someone optimize the request, direct io does what you want.
> in fact, dm receives bio requesting 1024 bytes, not 512.
> (optimizing it to page size, but here it is limited by device size).
>
> assuming that your arch has 4kb pages, try to setup device with
> 0 8 zero
> 8 8 error
Ahh, of course! The buffer cache is trying to read a whole page. And I
guess it just gives up and fails the entire request rather than retrying
only on the requested area.
prev parent reply other threads:[~2008-11-13 19:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-10 22:16 Error target causes entire device to error Phillip Susi
2008-11-13 18:38 ` Milan Broz
2008-11-13 19:43 ` Phillip Susi [this message]
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