From: Bart Van Assche <bart.vanassche@sandisk.com>
To: Hannes Reinecke <hare@suse.de>
Cc: device-mapper development <dm-devel@redhat.com>
Subject: Re: ALUA - rescan device capacity on zero sized block devices
Date: Tue, 14 Apr 2015 11:49:54 +0200 [thread overview]
Message-ID: <552CE2C2.8000809@sandisk.com> (raw)
In-Reply-To: <552CCC77.9040703@suse.de>
On 04/14/15 10:14, Hannes Reinecke wrote:
> What we can try is to listen to uevents for the device capacity
> change or ALUA state changes, and retry the read capacity for those
> events.
Any mechanism that relies on uevents would be asynchronous. We need a
way to ensure that the capacity data is up to date before any
application starts using that data. In this context that means before
multipath starts queueing I/O to a path. This might be challenging when
processing uevents asynchronously ...
Bart.
next prev parent reply other threads:[~2015-04-14 9:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-13 15:32 ALUA - rescan device capacity on zero sized block devices Thomas Wouters
2015-04-13 17:44 ` Bart Van Assche
2015-04-14 7:20 ` Thomas Wouters
2015-04-14 7:45 ` Bart Van Assche
2015-04-14 14:34 ` Christophe Varoqui
2015-04-14 8:14 ` Hannes Reinecke
2015-04-14 9:49 ` Bart Van Assche [this message]
2015-04-18 22:56 ` Christophe Varoqui
2015-04-20 5:58 ` Hannes Reinecke
2015-06-10 15:02 ` [dm-devel] " Ewan Milne
2015-06-11 5:52 ` Hannes Reinecke
2015-06-12 15:17 ` Ewan Milne
2015-06-12 16:59 ` Ewan Milne
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