ZFS

Links

• ZFS on Linux
• https://wiki.gentoo.org/wiki/ZFS
• ZFS cheatsheet
• http://open-zfs.org
• http://wiki.freebsd.org/ZFSQuickStartGuide
• http://www.opensolaris.org/os/community/zfs/intro/
• http://en.wikipedia.org/wiki/ZFS
• http://www.edplese.com/samba-with-zfs.html
• ZFS calculator
• ZFS clustering
• https://jrs-s.net/2015/02/03/will-zfs-and-non-ecc-ram-kill-your-data/ ZFS and ECC]

• ZFS troubleshooting/disk replacement
• raidz types reference
• Using and tuning ARC

 

HOWTO

Replace disk in zfs

Some links

• https://itectec.com/ubuntu/ubuntu-replacing-a-dead-disk-in-a-zpool/

Get information first:

Name of disk

zpool status

Find uid of disk to replace

take it offline

zpool offline poolname ata-WDC_WD20EFRX-68EUZN0_WD-WCC4M5RLZC6V

Get the disk guid:

zdb

guid: 15233236897831806877

Get list of disk by id:

ls -al /dev/disk/by-id

Save the id, shutdown, replace disk, boot:

Find the new disk:

ls -al /dev/disk/by-id

Run replace command. The id is the guid of the old disk, name is of the new disk

zpool replace tank /dev/disk/by-id/13450850036953119346 /dev/disk/by-id/ata-ST4000VN000-1H4168_Z302FQVZ

FAQ

invalid vdev specification

Probably means you need -f

Tuning arc settings

arcstat
arc_summary
grep c_max /proc/spl/kstat/zfs/arcstats
echo 5368709120 > /sys/module/zfs/parameters/zfs_arc_max

maybe you need

echo 3 > /proc/sys/vm/drop_caches

FAQ

show status and disks

zpool status

show drives/pools

zfs list
      

check raid level

zfs list -a