On 13-2-2017 04:22, Alex Gorbachev wrote:
> Hello, with the preference for IT mode HBAs for OSDs and journals,
> what redundancy method do you guys use for the boot drives. Some
> options beyond RAID1 at hardware level we can think of:
>
> - LVM
>
> - ZFS RAID1 mode
Since it is not quite Ceph, I take the liberty to answer with a bit not
Linux. :)
On FreeBSD I always use RAID1 bootdisks, it is natively supoorted from
both kernel and installer. Fits really nice with the upgrading tools,
allowing it to roll-back if upgrades did not work, or to boot with one
of the previous snapshotted bootdisks.
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH
zfsroot 228G 2.57G 225G - 0% 1% 1.00x ONLINE
mirror 228G 2.57G 225G - 0% 1%
ada0p3 - - - - - -
ada1p3 - - - - - -
zfsroot 2.57G 218G 19K /zfsroot
zfsroot/ROOT 1.97G 218G 19K none
zfsroot/ROOT/default 1.97G 218G 1.97G /
zfsroot/tmp 22.5K 218G 22.5K /tmp
zfsroot/usr 613M 218G 19K /usr
zfsroot/usr/compat 19K 218G 19K /usr/compat
zfsroot/usr/home 34K 218G 34K /usr/home
zfsroot/usr/local 613M 218G 613M /usr/local
zfsroot/usr/ports 19K 218G 19K /usr/ports
zfsroot/usr/src 19K 218G 19K /usr/src
zfsroot/var 230K 218G 19K /var
zfsroot/var/audit 19K 218G 19K /var/audit
zfsroot/var/crash 19K 218G 19K /var/crash
zfsroot/var/log 135K 218G 135K /var/log
zfsroot/var/mail 19K 218G 19K /var/mail
zfsroot/var/tmp 19K 218G 19K /var/tmp
Live maintenance is also a piece of cake with this.
If on a server SSDs are used, then I add a bit of cache. But as you see
the root stuff, include /usr and likes, is only 2.5Gb. And the most used
part will be in ZFS ARC, certainly if you did not save cost on RAM.
--WjW
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