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spa_load_verify() may consume too much memory

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When a pool is imported it will scan the pool to verify the integrity
of the data and metadata. The amount it scans will depend on the
import flags provided. On systems with small amounts of memory or
when importing a pool from the crash kernel, it's possible for
spa_load_verify to issue too many I/Os that it consumes all the memory
of the system resulting in an OOM message or a hang.

To prevent this, we limit the amount of memory that the initial pool
scan can consume. This change will, by default, use 1/16th of the ARC
for scan I/Os to prevent running the system out of memory during import.

Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Signed-off-by: George Wilson george.wilson@delphix.com
External-issue: DLPX-65237
External-issue: DLPX-65238
Closes #9146
This commit is contained in:
George Wilson
2019-08-13 08:11:57 -06:00
committed by Tony Hutter
parent d38e4ee142
commit 628fd31d26
4 changed files with 30 additions and 21 deletions
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man/man5/zfs-module-parameters.5
+4 -4
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@@ -505,13 +505,13 @@ Default value: \fB1\fR.
.sp
.ne 2
.na
\fBspa_load_verify_maxinflight\fR (int)
\fBspa_load_verify_shift\fR (int)
.ad
.RS 12n
Maximum concurrent I/Os during the traversal performed during an "extreme
rewind" (\fB-X\fR) pool import.
Sets the maximum number of bytes to consume during pool import to the log2
fraction of the target arc size.
.sp
Default value: \fB10000\fR.
Default value: \fB4\fR.
.RE
.sp