From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
To: Or Gerlitz <or.gerlitz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
David Dillow <dillowda-1Heg1YXhbW8@public.gmane.org>,
Roland Dreier <roland-BHEL68pLQRGGvPXPguhicg@public.gmane.org>
Subject: Re: [PATCH 00/19, v5] Make ib_srp better suited for H.A. purposes
Date: Tue, 13 Nov 2012 09:41:57 +0100 [thread overview]
Message-ID: <50A207D5.6060207@acm.org> (raw)
In-Reply-To: <CAJZOPZJPQkJ-kkW3ro9sRJXQJg_Yz_tjoJ1Rwb=XEePO3j_iJw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 11/12/12 23:36, Or Gerlitz wrote:
> Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org> wrote:
>> This patch series makes the ib_srp driver better suited for use in a H.A. setup because:
>> - multipathd is notified faster about transport layer failures.
>> - Transport layer failures reliably result in SCSI host removal.
>> - Switchover can be triggered explicitly by deleting an initiator device.
>> - Disconnecting from a target without unloading ib_srp is now possible.
>
> Can you describe few use cases, HA tests which don't pass w.o these
> patches and do pass or react better with them?
This patch series reduces path failover time significantly. Instead of
having to wait until the SCSI error handler has finished recovery,
multipathd switches paths as soon as fast_fail_tmo has elapsed. Also,
SCSI hosts that correspond to failed paths are removed. With the
upstream SRP initiator and when triggering path failover repeatedly
after some time hundreds of obsolete SCSI hosts are present.
>> Changes since v2:
> [...]
>> - Dropped the patches for integration with multipathd.
> can you explain this please? are these non SRP patches which we
> submitted/accepted
> through another maintainer? can you point on the upstream commits?
With that comment I was referring to the dev_loss_tmo and
fast_io_fail_tmo sysfs variables that had been dropped in v2 of this
patch set but that have been reintroduced in v3 of this patch set. If
these parameters have been set in /etc/multipath.conf then multipathd
passes these on to the block driver (ib_srp in this case), at least the
block driver provides the dev_loss_tmo and fast_io_fail_tmo sysfs
attributes.
Bart.
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next prev parent reply other threads:[~2012-11-13 8:41 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 12:44 [PATCH 00/19, v5] Make ib_srp better suited for H.A. purposes Bart Van Assche
2012-10-26 12:52 ` [PATCH 11/19] srp_transport: Fix attribute registration Bart Van Assche
2012-10-26 12:54 ` [PATCH 13/19] srp_transport: Document sysfs attributes Bart Van Assche
2012-10-26 12:55 ` [PATCH 14/19] ib_srp: Allow SRP disconnect through sysfs Bart Van Assche
[not found] ` <508A85BB.1000505-HInyCGIudOg@public.gmane.org>
2012-10-26 12:45 ` [PATCH 01/19] ib_srp: Enlarge block layer timeout Bart Van Assche
2012-10-26 12:46 ` [PATCH 02/19] ib_srp: Eliminate state SRP_TARGET_CONNECTING Bart Van Assche
2012-10-26 12:46 ` [PATCH 03/19] ib_srp: Introduce srp_handle_qp_err() Bart Van Assche
2012-10-26 12:47 ` [PATCH 04/19] ib_srp: Suppress superfluous error messages Bart Van Assche
2012-10-26 12:48 ` [PATCH 05/19] ib_srp: Avoid that SCSI error handling causes trouble Bart Van Assche
2012-10-26 12:49 ` [PATCH 06/19] ib_srp: Introduce the helper function srp_remove_target() Bart Van Assche
2012-10-26 12:49 ` [PATCH 07/19] ib_srp: Eliminate state SRP_TARGET_DEAD Bart Van Assche
2012-10-26 12:50 ` [PATCH 08/19] ib_srp: Keep processing commands during host removal Bart Van Assche
2012-10-26 12:50 ` [PATCH 09/19] ib_srp: Make srp_disconnect_target() wait for IB completions Bart Van Assche
2012-10-26 12:51 ` [PATCH 10/19] ib_srp: Document sysfs attributes Bart Van Assche
2012-10-26 12:53 ` [PATCH 12/19] srp_transport: Simplify attribute initialization code Bart Van Assche
2012-10-26 12:55 ` [PATCH 15/19] ib_srp: Maintain a single connection per I_T nexus Bart Van Assche
2012-10-26 12:56 ` [PATCH 16/19] srp_transport: Add transport layer error handling Bart Van Assche
2012-10-26 12:57 ` [PATCH 17/19] ib_srp: Add dev_loss_tmo support Bart Van Assche
2012-10-26 12:58 ` [PATCH 18/19] ib_srp: Remove SCSI devices upon port down event Bart Van Assche
[not found] ` <508A88D8.2050905-HInyCGIudOg@public.gmane.org>
2012-11-12 22:40 ` Or Gerlitz
[not found] ` <CAJZOPZL8mKU2MsrPPACvWjiA59aGnWDj0HNTQQNhbDrMsE0+Tg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 8:59 ` Bart Van Assche
[not found] ` <50A20C03.9040607-HInyCGIudOg@public.gmane.org>
2012-11-13 20:54 ` Or Gerlitz
[not found] ` <CAJZOPZ+PiDQ6GYLkDO4MaPTDxLr2XDMn8q3gTaX-COx04PSegg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 21:20 ` Bart Van Assche
[not found] ` <50A2B989.8000600-HInyCGIudOg@public.gmane.org>
2012-11-13 21:23 ` Or Gerlitz
[not found] ` <CAJZOPZLSPz7f99tj2w-79sPbibrHP3WZY_ct0Cq07Q1so54kFQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 21:35 ` Bart Van Assche
2012-10-26 12:58 ` [PATCH 19/19] scsi_transport_srp: Fail I/O faster Bart Van Assche
2012-11-12 22:36 ` [PATCH 00/19, v5] Make ib_srp better suited for H.A. purposes Or Gerlitz
[not found] ` <CAJZOPZJPQkJ-kkW3ro9sRJXQJg_Yz_tjoJ1Rwb=XEePO3j_iJw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 8:41 ` Bart Van Assche [this message]
[not found] ` <50A207D5.6060207-HInyCGIudOg@public.gmane.org>
2012-11-13 21:04 ` Or Gerlitz
[not found] ` <CAJZOPZJXdLRH9NPCt0snGNP8LKODO+phtV7uts6Vj-gxEEjpsw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 21:30 ` Bart Van Assche
[not found] ` <50A2BC01.40609-HInyCGIudOg@public.gmane.org>
2012-11-13 21:41 ` Or Gerlitz
[not found] ` <CAJZOPZLQ8B9UGvGdM5LvA6r+XDARO5BXGoMmtdSH6+8EMyMaXw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 22:35 ` Bart Van Assche
2012-11-12 22:51 ` Or Gerlitz
[not found] ` <CAJZOPZLHg84M3RUV00itGSGUZsigW0yw=TLOe6K63mUXH5v1pQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 8:34 ` Bart Van Assche
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