ZFS

ZFS tips and tricks

Create pool with raid

zpool create raidz2 <pool name> <disk1> ... <diskN>

Create pool with RAID 5 double parity

ZFS caches

• ARC: RAM cache
• L2ARC: Level 2 ARC, on SSD, no need for redundancy
• ZIL (ZFS Intent Log) SLOG (Separate intent Log): persistent write cache, redundancy needed

Add L2ARC cache to existing pool

zpool add <pool name> cache <disk>

Add SLOG disk cache to existing pool

zpool add <pool name> log mirror <disk ssd1> <disk ssd2>

Stats

View iostat

Since boot

zpool iostat

Dynamic view with 1sec interval

zpool iostat 1

including virtual drives

zpool iostat 1 -v

Quotas

zfs set quota=XXG <pool name>

Manage cache file

Re-generate the zpool.cache configuration file

zpool set cachefile=/etc/zfs/zpool.cache <pool name>