Add knob to disable slow io notifications #17477
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Introduce a new vdev property `VDEV_PROP_SLOW_IO_REPORTING` that allows users to disable notifications for slow devices. This prevents ZED and/or ZFSD from degrading the pool due to slow I/O. Signed-off-by: Mariusz Zaborski <oshogbo@FreeBSD.org>
amotin
reviewed
Jun 24, 2025
| @@ -45,7 +45,7 @@ section, below. | |||
| Every vdev has a set of properties that export statistics about the vdev | |||
| as well as control various behaviors. | |||
| Properties are not inherited from top-level vdevs, with the exception of | |||
| checksum_n, checksum_t, io_n, io_t, slow_io_n, and slow_io_t. | |||
| checksum_n, checksum_t, io_n, io_t, slow_io_downgrade, slow_io_n, and slow_io_t. | |||
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Should here and below be slow_io_reporting instead of slow_io_downgrade?
| uint64_t ivalue; | ||
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| err = vdev_prop_get_int(vd, prop, &ivalue); | ||
| *bvalue = ivalue & 1; |
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I wonder if this feature partially duplicates |
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Motivation and Context
Adding a knob allows disabling the slow_io check on a single vdev. Some users have reported that it breaks their enterprise configuration when one or more vdevs are using fiber channels with redundancy. Another reason to disable the check might be when a vdev is damaged, but we still want to force some resilvering from it.
Description
Add a knob to disable slow I/O event generation for a single vdev.
How Has This Been Tested?
New test has been added.
Types of changes
Checklist:
Signed-off-by.