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ZFS zpool won't automount on boot [solved]
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vesperto
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Joined: 21 May 2015
Posts: 34

PostPosted: Sun Aug 23, 2015 9:40 pm    Post subject: ZFS zpool won't automount on boot [solved] Reply with quote

This is a one-off from a ZFS-newbie, it got me wondering for a few hours.

I followed the wiki and installed ZFS as a module, didn't use any of the 999 stuff. I added the relevant ZFS scripts to the boot runlevel, although the only ones i could find are zfs and zed. The others in the wiki don't exist in my system. I created a zpool:
Code:
# zpool create -o ashift=12 -R /mnt tank mirror /dev/disk/by-id/myDisk01 /dev/disk/by-id/myDisk02
The ashift because i have AFD disks, -R because i don't like stuff at /.

Upon reboot, i confirmed the module had been loaded:
Code:
# dmesg|grep -i zfs
[    6.060676] ZFS: Loaded module v0.6.4.2-r0-gentoo, ZFS pool version 5000, ZFS filesystem version 5
# lsmod|grep zfs
zfs                  2008238  4
zunicode              320020  1 zfs
zavl                    4417  1 zfs
zcommon                33212  1 zfs
znvpair                44512  2 zfs,zcommon
spl                    57538  3 zfs,zcommon,znvpair
Yet i had no zpool:
Code:
# zpool list
no pools available
# zpool status
no pools available

After reading the (extensive) manpages carefully i noticed that -R in zpool create means Equivalent to "-o cachefile=none,altroot=root". At first i skipped this because i translated "cache" as ARC and L2ARC but then i realized this cache file is where ZFS stores information about... zpools :) So i changed my create line to:
Code:
# zpool create -o ashift=12 -o cachefile=/etc/zfs/zpool.cache  -o altroot=/mnt tank mirror /dev/disk/by-id/myDisk01 /dev/disk/by-id/myDisk02
and now it boots with the zpool mounted.

However, it doesn't seem to honor all properties:
Code:
# zpool get altroot,cachefile,ashift tank
NAME   PROPERTY   VALUE      SOURCE
tank    altroot    -          default
tank    cachefile  -          default
tank    ashift     12         local
It gets mounted as /tank instead of /mnt/tank.
It does have a /etc/zfs/zpool.cache PDP-11 UNIX/RT ldp file, even though it doesn't list it.
The ashift is correct.
Other than that... it works. I haven't capped ARC nor created datasets yet, but it works. Aaron Toponce's blogpost collection on ZFS is good resource material.
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