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Release topology restrictions on special/dedup

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Special vdevs were originally designed as a small blocks storage
for dRAID, for which role RAIDZ/dRAID topologies are not good.
But it is more often used as SSD storage for metadata and hot
data of HDD pools.  In these use cases narrow RAIDZ of SSDs might
be fine, so we should not introduce unnecessary restrictions,
and ZFS internally does not care.

Similar applies to dedup vdevs.  Original DDT used 4KB blocks,
for which anything but mirror was a terrible storage.  But new
FDT implementation uses 32KB blocks by default, which are much
less demanding even including compression, and which could be
increased even higher now, if needed.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #17496
This commit is contained in:
Alexander Motin
2025-07-02 12:33:47 -04:00
committed by GitHub
parent eacf618a65
commit bf846dcb7d
5 changed files with 30 additions and 12 deletions
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cmd/zpool/zpool_vdev.c
+15 -4
View File
@@ -876,6 +876,18 @@ check_replication(nvlist_t *config, nvlist_t *newroot)
(u_longlong_t)mirror->zprl_children);
ret = -1;
}
} else if (is_raidz_draid(current, new)) {
if (current->zprl_parity != new->zprl_parity) {
vdev_error(gettext(
"mismatched replication level: pool and "
"new vdev with different redundancy, %s "
"and %s vdevs, %llu vs. %llu\n"),
current->zprl_type,
new->zprl_type,
(u_longlong_t)current->zprl_parity,
(u_longlong_t)new->zprl_parity);
ret = -1;
}
} else if (strcmp(current->zprl_type, new->zprl_type) != 0) {
vdev_error(gettext(
"mismatched replication level: pool uses %s "
@@ -1581,13 +1593,12 @@ construct_spec(nvlist_t *props, int argc, char **argv)
is_dedup = is_spare = B_FALSE;
}
if (is_log || is_special || is_dedup) {
if (is_log) {
if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
(void) fprintf(stderr,
gettext("invalid vdev "
"specification: unsupported '%s' "
"device: %s\n"), is_log ? "log" :
"special", type);
"specification: unsupported 'log' "
"device: %s\n"), type);
goto spec_out;
}
nlogs++;