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Don't emit checksum histograms in ereport.fs.zfs.checksum events

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The checksum histograms were intended to be used with ATA and parallel
SCSI, which are obsolete.  With modern storage hardware, they will
almost always look like white noise; all bits will be wrong.  They only
serve to bloat the event.  That's a particular problem on FreeBSD, where
events must fit into a 1016 byte buffer.

This fixes issue #14717 for RAIDZ pools, but not for mirror pools.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Alan Somers <asomers@gmail.com>
Sponsored-by: Axcient
Closes #15052
This commit is contained in:
Alan Somers
2023-07-11 14:45:06 -06:00
committed by Brian Behlendorf
parent ab0b0393cb
commit cf2a225b24
3 changed files with 5 additions and 41 deletions
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man/man8/zpool-events.8
+1 -18
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@@ -26,7 +26,7 @@
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
.\"
.Dd May 27, 2021
.Dd July 11, 2023
.Dt ZPOOL-EVENTS 8
.Os
.
@@ -362,23 +362,6 @@ Like
but contains
.Pq Ar good data No & ~( Ns Ar bad data ) ;
that is, the bits set in the good data which are cleared in the bad data.
.It Sy bad_set_histogram
If this field exists, it is an array of counters.
Each entry counts bits set in a particular bit of a big-endian uint64 type.
The first entry counts bits
set in the high-order bit of the first byte, the 9th byte, etc, and the last
entry counts bits set of the low-order bit of the 8th byte, the 16th byte, etc.
This information is useful for observing a stuck bit in a parallel data path,
such as IDE or parallel SCSI.
.It Sy bad_cleared_histogram
If this field exists, it is an array of counters.
Each entry counts bit clears in a particular bit of a big-endian uint64 type.
The first entry counts bits
clears of the high-order bit of the first byte, the 9th byte, etc, and the
last entry counts clears of the low-order bit of the 8th byte, the 16th byte,
etc.
This information is useful for observing a stuck bit in a parallel data
path, such as IDE or parallel SCSI.
.El
.
.Sh I/O STAGES