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41 lines
1.6 KiB
41 lines
1.6 KiB
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Thu, 25 Apr 2024 19:35:16 -0400
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Subject: [PATCH] libmultipath: pad dev_loss_tmo to avoid race with
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no_path_retry
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Currently multipath makes sure that dev_loss_tmo is at least as long as
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the configured no path queueing time. The goal is to make sure that path
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devices aren't removed while the multipath device is still queueing in
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hopes that they will become usable again.
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This is racy. Multipathd may take longer to check the paths than
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configured. If strict_timing isn't set, it will definitely take longer.
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To account for this, pad the minimum dev_loss_tmo value by five seconds
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(one default checker interval) plus one second per minute of no path
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queueing time.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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Reviewed-by: Martin Wilck <mwilck@suse.com>
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Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/discovery.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
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index ae7eb7e6..b24594cd 100644
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--- a/libmultipath/discovery.c
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+++ b/libmultipath/discovery.c
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@@ -884,6 +884,11 @@ sysfs_set_scsi_tmo (struct config *conf, struct multipath *mpp)
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uint64_t no_path_retry_tmo =
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(uint64_t)mpp->no_path_retry * conf->checkint;
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+ /* pad no_path_retry_tmo by one standard check interval
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+ * plus one second per minute to account for timing
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+ * issues with the rechecks */
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+ no_path_retry_tmo += no_path_retry_tmo / 60 + DEFAULT_CHECKINT;
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+
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if (no_path_retry_tmo > MAX_DEV_LOSS_TMO)
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min_dev_loss = MAX_DEV_LOSS_TMO;
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else
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