From: Christophe Varoqui <christophe.varoqui@free.fr>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: Adding/removing multi-pathed disk partitions
Date: Thu, 17 Feb 2005 23:38:40 +0100 [thread overview]
Message-ID: <42151CF0.90709@free.fr> (raw)
In-Reply-To: <C2EEB4E538D3DC48BF57F391F422779321A708@SRMANNING.eng.emc.com>
goggin, edward wrote:
>Should one be using the multi-path device-mapper mapped device
>name or one of the SCSI target device names for the whole disk
>device when modifying a SCSI disk's partition table with fdisk(8)?
>
>If the former, drivers/block/ioctl.c:blkdev_reread_part()
>currently returns EINVAL since the mapped device is not
>partitionable. I can't imagine the recommendation is the
>latter, since there is no mechanism in place to synchronize
>the kernel's partition table handling amongst multiple target
>devices.
>
>--
>
As discussed earlier, one face of this problem is that kpartx does
buffered reads to grab the on-disk partition table, leading to
situations where kpartx ->fdisk -> kpartx sequence does not garanty
partitons-to-maps layout will reflect reality.
To address this particular problem, do you think adding O_DIRECT to the
open() call in kpartx.c would be enough ?
Regards,
cvaroqui
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next prev parent reply other threads:[~2005-02-17 22:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-25 21:07 Adding/removing multi-pathed disk partitions goggin, edward
2005-01-25 22:34 ` christophe varoqui
2005-01-26 8:52 ` Lars Marowsky-Bree
2005-02-17 22:38 ` Christophe Varoqui [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-01-31 14:05 goggin, edward
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