From: J. Bruce Fields <bfields@fieldses.org>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] Re: [NFS] [PATCH 0/4 Revised] NLM - lock failover
Date: Wed, 25 Apr 2007 10:18:18 -0400 [thread overview]
Message-ID: <20070425141818.GA14729@fieldses.org> (raw)
In-Reply-To: <46156F3F.3070606@redhat.com>
On Thu, Apr 05, 2007 at 05:50:55PM -0400, Wendy Cheng wrote:
> 1) Failover server exports filesystem with "fsid" option as:
> /etc/exports entry> /mnt/shared/exports *(fsid=1234,sync,rw)
> 2) Failover server dispatch rpc.statd with "-H" option.
> 3) Failover server drops locks based on fsid by:
> shell> echo 1234 > /proc/fs/nfsd/nlm_unlock
> 4) Takeover server enters per fsid grace period by:
> shell> echo 1234 > /proc/fs/nfsd/nlm_set_igrace
> 5) Takeover server notifies clients for lock reclaim by:
> shell> /usr/sbin/sm-notify -f -v floating_ip_address -P an_sm_directory
I don't understand statd and lockd as well as I should. Where exactly
does the takeover server stop serving requests, and the failover server
start? If this isn't done carefully, you can leave a window between
steps 3 and 4 where a client could acquire a lock before its rightful
owner reclaims it, right?
--b.
WARNING: multiple messages have this Message-ID (diff)
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Wendy Cheng <wcheng@redhat.com>
Cc: cluster-devel@redhat.com, Lon Hohberger <lhh@redhat.com>,
nfs@lists.sourceforge.net
Subject: Re: [PATCH 0/4 Revised] NLM - lock failover
Date: Wed, 25 Apr 2007 10:18:18 -0400 [thread overview]
Message-ID: <20070425141818.GA14729@fieldses.org> (raw)
In-Reply-To: <46156F3F.3070606@redhat.com>
On Thu, Apr 05, 2007 at 05:50:55PM -0400, Wendy Cheng wrote:
> 1) Failover server exports filesystem with "fsid" option as:
> /etc/exports entry> /mnt/shared/exports *(fsid=1234,sync,rw)
> 2) Failover server dispatch rpc.statd with "-H" option.
> 3) Failover server drops locks based on fsid by:
> shell> echo 1234 > /proc/fs/nfsd/nlm_unlock
> 4) Takeover server enters per fsid grace period by:
> shell> echo 1234 > /proc/fs/nfsd/nlm_set_igrace
> 5) Takeover server notifies clients for lock reclaim by:
> shell> /usr/sbin/sm-notify -f -v floating_ip_address -P an_sm_directory
I don't understand statd and lockd as well as I should. Where exactly
does the takeover server stop serving requests, and the failover server
start? If this isn't done carefully, you can leave a window between
steps 3 and 4 where a client could acquire a lock before its rightful
owner reclaims it, right?
--b.
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next prev parent reply other threads:[~2007-04-25 14:18 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 21:50 [Cluster-devel] [PATCH 0/4 Revised] NLM - lock failover Wendy Cheng
2007-04-05 21:50 ` Wendy Cheng
2007-04-11 17:01 ` [Cluster-devel] Re: [NFS] " J. Bruce Fields
2007-04-11 17:01 ` J. Bruce Fields
2007-04-17 19:30 ` [Cluster-devel] " Wendy Cheng
2007-04-17 19:30 ` Wendy Cheng
2007-04-18 18:56 ` [Cluster-devel] " Wendy Cheng
2007-04-18 18:56 ` Wendy Cheng
2007-04-18 19:46 ` [Cluster-devel] " Wendy Cheng
2007-04-18 19:46 ` Wendy Cheng
2007-04-19 14:41 ` [Cluster-devel] Re: [NFS] " Christoph Hellwig
2007-04-19 14:41 ` Christoph Hellwig
2007-04-19 15:08 ` [Cluster-devel] Re: [NFS] " Wendy Cheng
2007-04-19 15:08 ` Wendy Cheng
[not found] ` <message from Wendy Cheng on Tuesday April 17>
2007-04-19 7:04 ` [Cluster-devel] " Neil Brown
2007-04-19 7:04 ` Neil Brown
2007-04-19 14:53 ` Wendy Cheng
2007-04-19 14:53 ` Wendy Cheng
2007-04-24 3:30 ` Wendy Cheng
2007-04-24 3:30 ` Wendy Cheng
[not found] ` <message from Wendy Cheng on Monday April 23>
2007-04-24 5:52 ` [NFS] " Neil Brown
2007-04-24 5:52 ` Neil Brown
2007-04-26 4:35 ` [NFS] " Wendy Cheng
2007-04-26 4:35 ` Wendy Cheng
[not found] ` <message from Wendy Cheng on Thursday April 26>
2007-04-26 5:43 ` [NFS] " Neil Brown
2007-04-26 5:43 ` Neil Brown
2007-04-27 2:24 ` [NFS] " Wendy Cheng
2007-04-27 2:24 ` Wendy Cheng
2007-04-27 6:00 ` [NFS] " Neil Brown
2007-04-27 6:00 ` Neil Brown
2007-04-27 11:15 ` [NFS] " Jeff Layton
2007-04-27 11:15 ` Jeff Layton
[not found] ` <message from Jeff Layton on Friday April 27>
2007-04-27 12:40 ` [NFS] " Neil Brown
2007-04-27 12:40 ` Neil Brown
2007-04-27 13:42 ` Jeff Layton
2007-04-27 18:57 ` [NFS] " Jeff Layton
2007-04-27 14:17 ` Christoph Hellwig
2007-04-27 14:17 ` Christoph Hellwig
2007-04-27 15:42 ` J. Bruce Fields
2007-04-27 15:43 ` [NFS] " J. Bruce Fields
2007-04-27 15:36 ` Wendy Cheng
2007-04-27 15:36 ` Wendy Cheng
2007-04-27 16:31 ` J. Bruce Fields
2007-04-27 16:31 ` [NFS] " J. Bruce Fields
[not found] ` <message from J. Bruce Fields on Friday April 27>
2007-04-27 22:22 ` Neil Brown
2007-04-27 22:22 ` Neil Brown
2007-04-29 20:13 ` J. Bruce Fields
2007-04-29 20:14 ` [NFS] " J. Bruce Fields
[not found] ` <message from J. Bruce Fields on Sunday April 29>
2007-04-29 23:10 ` Neil Brown
2007-04-29 23:10 ` Neil Brown
2007-04-30 5:19 ` [NFS] " Wendy Cheng
2007-04-30 5:19 ` Wendy Cheng
2007-05-04 18:42 ` [NFS] " J. Bruce Fields
2007-05-04 18:42 ` J. Bruce Fields
2007-05-04 21:35 ` [NFS] " Wendy Cheng
2007-05-04 21:35 ` Wendy Cheng
2007-04-27 20:34 ` Frank van Maarseveen
2007-04-27 20:34 ` [NFS] " Frank van Maarseveen
2007-04-28 3:55 ` Wendy Cheng
2007-04-28 3:55 ` Wendy Cheng
[not found] ` <message from Wendy Cheng on Friday April 27>
2007-04-28 4:51 ` [NFS] " Neil Brown
2007-04-28 4:51 ` Neil Brown
2007-04-28 5:26 ` Marc Eshel
2007-04-28 5:27 ` [NFS] " Marc Eshel
2007-04-28 12:33 ` Frank van Maarseveen
2007-04-28 12:33 ` [NFS] " Frank van Maarseveen
2007-04-27 15:12 ` Jeff Layton
2007-04-27 15:12 ` [NFS] " Jeff Layton
2007-04-25 14:18 ` J. Bruce Fields [this message]
2007-04-25 14:18 ` J. Bruce Fields
2007-04-25 14:10 ` [Cluster-devel] Re: [NFS] " Wendy Cheng
2007-04-25 14:10 ` Wendy Cheng
2007-04-25 15:21 ` [Cluster-devel] Re: [NFS] " Marc Eshel
2007-04-25 15:21 ` Marc Eshel
2007-04-25 15:19 ` [Cluster-devel] Re: [NFS] " Wendy Cheng
2007-04-25 15:19 ` Wendy Cheng
2007-04-25 15:39 ` [Cluster-devel] Re: [NFS] " Wendy Cheng
2007-04-25 15:39 ` [Cluster-devel] " Wendy Cheng
2007-04-25 15:59 ` [Cluster-devel] Re: [NFS] " J. Bruce Fields
2007-04-25 15:59 ` J. Bruce Fields
2007-04-25 15:52 ` [Cluster-devel] Re: [NFS] " Wendy Cheng
2007-04-25 15:52 ` Wendy Cheng
2011-11-30 10:13 ` Pavel
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