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spa_min_alloc should be GCD, not min

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Since spa_min_alloc may not be a power of 2, unlike ashifts, in the
case of DRAID, we should not select the minimal value among several
vdevs. Rounding to a multiple of it is unlikely to work for other
vdevs. Instead, using the greatest common divisor produces smaller
yet more reasonable results.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #15067
This commit is contained in:
Ameer Hamza
2023-07-20 22:23:52 +05:00
committed by GitHub
parent 929173ab42
commit d9bb583c25
4 changed files with 51 additions and 9 deletions
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module/zfs/spa_misc.c
+1
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@@ -772,6 +772,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
spa->spa_min_ashift = INT_MAX;
spa->spa_max_ashift = 0;
spa->spa_min_alloc = INT_MAX;
spa->spa_gcd_alloc = INT_MAX;
/* Reset cached value */
spa->spa_dedup_dspace = ~0ULL;