Ah, I figured out what's going on: the upper limit of
special_small_blocks is checked against the currently value of
recordsize. But, the pool doesn't actually have a recordsize set at this
point, because the pool doesn't even exist. So, the setting that was
given immediately before on the command line has no influence.
In short: Create the pool with only -O recordsize=1MB (or whatever) and
*then* set the special_small_blocks property after the pool exists:
sudo zfs set special_small_blocks=256KB newsrv
This isn't ideal but it doesn't really look like an Ubuntu packaging
bug. Thanks for rubberducking, launchpad!
** Changed in: zfs-linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2027535
Title:
unexpected error message: invalid 'special_small_blocks=262144'
property: must be zero or a power of 2 from 512B to 128K
Status in zfs-linux package in Ubuntu:
Invalid
Bug description:
Hello, I'm trying to create a new zfs pool using the special
allocation vdevs and I get an error message that doesn't make sense to
me:
cannot create 'newsrv': invalid 'special_small_blocks=262144'
property: must be zero or a power of 2 from 512B to 128K
$ echo "2 ^ 18" | bc -lq
262144
But the manpage says this number may be up to one megabyte:
sarnold@wopr:~ $ PAGER=cat MANWIDTH=70 man -7 --nh --nj zfsprops 2> /dev/null
| grep -A8 special_small_blocks
special_small_blocks=size
This value represents the threshold block size for including
small file blocks into the special allocation class. Blocks
smaller than or equal to this value will be assigned to the
special allocation class while greater blocks will be
assigned to the regular class. Valid values are zero or a
power of two from 512B up to 1M. The default size is 0 which
means no small file blocks will be allocated in the special
class.
Here is a small demonstration:
sarnold@wopr:/tmp $ truncate -s 200MB disk1
sarnold@wopr:/tmp $ truncate -s 200MB disk2
sarnold@wopr:/tmp $ sudo zpool create -O recordsize=1MB -O
special_small_blocks=256KB test /tmp/disk1 special /tmp/disk2
cannot create 'test': invalid 'special_small_blocks=262144' property: must be
zero or a power of 2 from 512B to 128K
sarnold@wopr:/tmp 1 $ sudo zpool create -O recordsize=1MB -O
special_small_blocks=128KB test /tmp/disk1 special /tmp/disk2
sarnold@wopr:/tmp $ zpool status test
pool: test
state: ONLINE
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
/tmp/disk1 ONLINE 0 0 0
special
/tmp/disk2 ONLINE 0 0 0
errors: No known data errors
sarnold@wopr:/tmp $ sudo zpool destroy test
sarnold@wopr:/tmp $
And now the actual command I tried:
sarnold@wopr:~ $ sudo zpool create -f -O atime=off -O checksum=skein -O
compression=zstd-3 -O dedup=skein -O recordsize=1MB -O
special_small_blocks=256KB -O xattr=sa newsrv mirror
/dev/disk/by-id/ata-WDC_WUH721414ALE604_9RKGP7NC
/dev/disk/by-id/ata-WDC_WUH721414ALE604_Z2K012NT mirror
/dev/disk/by-id/ata-WDC_WUH721414ALE604_Z2KH01NT
/dev/disk/by-id/ata-WDC_WUH721414ALE604_Z2KHG12T special
/dev/disk/by-id/ata-Samsung_SSD_870_EVO_4TB_S6PJNS0W312010E
/dev/disk/by-id/ata-Samsung_SSD_870_EVO_4TB_S6PJNS0W312031Z
/dev/disk/by-id/ata-Samsung_SSD_870_EVO_4TB_S6PJNS0W312033K
/dev/disk/by-id/ata-Samsung_SSD_870_EVO_4TB_S6PJNS0W312101T
cannot create 'newsrv': invalid 'special_small_blocks=262144' property: must
be zero or a power of 2 from 512B to 128K
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: zfsutils-linux 2.1.5-1ubuntu6~22.04.1
ProcVersionSignature: Ubuntu 5.15.0-70.77-generic 5.15.92
Uname: Linux 5.15.0-70-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Tue Jul 11 21:27:05 2023
InstallationDate: Installed on 2016-04-04 (2655 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Beta amd64
(20160325)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: zfs-linux
UpgradeStatus: Upgraded to jammy on 2022-08-14 (331 days ago)
modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Permission
denied: '/etc/sudoers.d/zfs']
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