From: Konrad Rzeszutek <konrad@virtualiron.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: How does multipath tool handle Lun remapping?
Date: Tue, 20 Jan 2009 10:44:00 -0500 [thread overview]
Message-ID: <20090120154400.GA19640@mars.virtualiron.com> (raw)
In-Reply-To: <d364733c0901191917y76543be4o5b14f29c057d1bd5@mail.gmail.com>
On Tue, Jan 20, 2009 at 11:17:53AM +0800, 谢纲 wrote:
> It make sense that multipath tool can notice that there is a
> recreation of OS device. But it still depends on the external program,
> such as scsi_id to get the identifier of the lun。
> I looked through the scsi_id source code, found that unit serial
> number might be returned if the device supported the EVPD inquery
> page80. This might be the wrong infomation for multipath tool, is that
> true?
That information is correct. You can prove it yourself by running
'scsi_id -g -u -s /block/sdb' before and after the deletion. The
value will be the same.
What is not correct is the LUN number. And for that there needs
to be a deletion of the block device and a recreation of them.
prev parent reply other threads:[~2009-01-20 15:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-16 8:42 How does multipath tool handle Lun remapping? 谢纲
2009-01-16 18:13 ` Konrad Rzeszutek
2009-01-20 3:17 ` 谢纲
2009-01-20 15:44 ` Konrad Rzeszutek [this message]
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