From: Martin Wilck <mwilck@suse.com>
To: Benjamin Marzinski <bmarzins@redhat.com>
Cc: dm-devel@redhat.com
Subject: Re: [PATCH 20/31] 11-dm-mpath.rules: don't set READY->ACTIVATION
Date: Thu, 14 Sep 2017 14:48:19 +0200 [thread overview]
Message-ID: <1505393299.4493.14.camel@suse.com> (raw)
In-Reply-To: <20170913211906.GM3145@octiron.msp.redhat.com>
On Wed, 2017-09-13 at 16:19 -0500, Benjamin Marzinski wrote:
> On Sun, Sep 03, 2017 at 12:38:49AM +0200, Martin Wilck wrote:
> > The fact alone that a map changes from not ready to ready does
> > not imply that it is activating.
>
> NAK on this one and
> [PATCH 21/31] 11-dm-mpath.rules: Remember DM_ACTIVATION
>
> This breaks things. It's often the case that there are devices
> stacked
> on top of multipath. When multipath loses all of its paths, if it
> doesn't have queue_if_no_path set, it can fail IO up to these higher
> devices, forcing them to react to the failure.
Thinking about this again, most of the stuff we do in the multipath-
related udev rules is for the queueing case. Without
"queue_if_no_path", all that checking whether or not the map will
sustain IO is useless; it would be better to simply pass the device on
to upper layers, which will try to probe it and fail, which is intended
in the non-queueing setup. Perhaps we should check "queue_if_no_path"
early on and skip most of the stuff we do in the queueing case?
If we did this, maybe even my patches 20/21 might be worth
reconsideration for the "queue_if_no_path" case only?
Cheers,
Martin
--
Dr. Martin Wilck <mwilck@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
--
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next prev parent reply other threads:[~2017-09-14 12:48 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-02 22:38 [PATCH 00/31] multipath/kpartx udev rules cleanup, and fixes Martin Wilck
2017-09-02 22:38 ` [PATCH 01/31] libmultipath: fix partition_delimiter config option Martin Wilck
2017-09-02 22:38 ` [PATCH 02/31] kpartx: helper functions for name and uuid generation Martin Wilck
2017-09-02 22:38 ` [PATCH 03/31] kpartx: search partitions by UUID, and rename Martin Wilck
2017-09-02 22:38 ` [PATCH 04/31] test-kpartx: add tests for renaming functionality Martin Wilck
2017-09-02 22:38 ` [PATCH 05/31] kpartx: fix a corner case when renaming partitions Martin Wilck
2017-09-02 22:38 ` [PATCH 06/31] kpartx: fix part deletion without partition table Martin Wilck
2017-09-02 22:38 ` [PATCH 07/31] test-kpartx: test deletion with empty part table Martin Wilck
2017-09-02 22:38 ` [PATCH 08/31] kpartx: only recognize dasd part table on DASD Martin Wilck
2017-09-02 22:38 ` [PATCH 09/31] libmultipath: support MPATH_UDEV_NO_PATHS_FLAG on map creation Martin Wilck
2017-09-13 20:33 ` Benjamin Marzinski
2017-09-14 11:53 ` Martin Wilck
2017-09-02 22:38 ` [PATCH 10/31] libmultipath: add get_udev_device Martin Wilck
2017-09-02 22:38 ` [PATCH 11/31] libmultipath: get_refwwid: use get_udev_device Martin Wilck
2017-09-02 22:38 ` [PATCH 12/31] libmultipath: use const char* in some dm helpers Martin Wilck
2017-09-02 22:38 ` [PATCH 13/31] libmultipath: add DI_NOIO flag for pathinfo Martin Wilck
2017-09-02 22:38 ` [PATCH 14/31] libmultipath: add dm_get_multipath Martin Wilck
2017-09-02 22:38 ` [PATCH 15/31] multipath: implement "check usable paths" (-C/-U) Martin Wilck
2017-09-13 20:53 ` Benjamin Marzinski
2017-09-14 11:47 ` Martin Wilck
2017-09-15 21:06 ` Benjamin Marzinski
2017-09-02 22:38 ` [PATCH 16/31] 11-dm-mpath.rules: multipath -U for READY check Martin Wilck
2017-09-02 22:38 ` [PATCH 17/31] 11-dm-mpath.rules: import more ID_FS_xxx vars from db Martin Wilck
2017-09-02 22:38 ` [PATCH 18/31] 11-dm-mpath.rules: no need to test before IMPORT Martin Wilck
2017-09-02 22:38 ` [PATCH 19/31] 11-dm-mpath.rules: handle new maps with READY==0 Martin Wilck
2017-09-02 22:38 ` [PATCH 20/31] 11-dm-mpath.rules: don't set READY->ACTIVATION Martin Wilck
2017-09-13 21:19 ` Benjamin Marzinski
2017-09-13 21:33 ` Martin Wilck
2017-09-14 12:48 ` Martin Wilck [this message]
2017-09-15 20:33 ` Benjamin Marzinski
2017-09-02 22:38 ` [PATCH 21/31] 11-dm-mpath.rules: Remember DM_ACTIVATION Martin Wilck
2017-09-13 21:19 ` Benjamin Marzinski
2017-09-14 13:06 ` Martin Wilck
2017-09-15 20:40 ` Benjamin Marzinski
2017-09-18 19:54 ` Martin Wilck
2017-09-02 22:38 ` [PATCH 22/31] multipath.rules: set ID_FS_TYPE to "mpath_member" Martin Wilck
2017-09-02 22:38 ` [PATCH 23/31] kpartx.rules: don't rely on DM_DEPS and DM_TABLE_STATE Martin Wilck
2017-09-02 22:38 ` [PATCH 24/31] kpartx.rules: respect DM_UDEV_LOW_PRIORITY_FLAG Martin Wilck
2017-09-02 22:38 ` [PATCH 25/31] kpartx.rules: improved logic for by-uuid and by-label links Martin Wilck
2017-09-02 22:38 ` [PATCH 26/31] kpartx.rules: create by-partuuid and by-partlabel symlinks Martin Wilck
2017-09-02 22:38 ` [PATCH 27/31] kpartx.rules: generate type-name links only for multipath devices Martin Wilck
2017-09-02 22:38 ` [PATCH 28/31] kpartx.rules: fix logic for adding partitions Martin Wilck
2017-09-02 22:38 ` [PATCH 29/31] multipath/kpartx rules: avoid superfluous scanning Martin Wilck
2017-09-02 22:38 ` [PATCH 30/31] kpartx/del-part-nodes.rules: new udev file Martin Wilck
2017-09-13 21:23 ` Benjamin Marzinski
2017-09-02 22:39 ` [PATCH 31/31] kpartx.rules: move symlink code to other files Martin Wilck
2017-09-13 21:26 ` Benjamin Marzinski
2017-09-13 21:28 ` [PATCH 00/31] multipath/kpartx udev rules cleanup, and fixes Benjamin Marzinski
2017-09-14 11:56 ` Martin Wilck
2017-09-14 20:00 ` [PATCH v2 30/31] kpartx/del-part-nodes.rules: new udev file Martin Wilck
2017-09-14 20:00 ` [PATCH v2 31/31] kpartx.rules: move symlink code to other files Martin Wilck
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