Yes, here it is .... (performance is vmware on laptop, so sorry for that)
How did I test ?
1) My Disks:
LUN ID Device Type Size Volume Mounted Remov Attach
c0t0d0 sd4 cdrom No Media no yes ata
c1t0d0 sd0 disk 8GB syspool no no mpt
c1t1d0 sd1 disk 20GB data no no mpt
c1t2d0 sd2 disk 20GB data no no mpt
c1t3d0 sd3 disk 20GB data no no mpt
c1t4d0 sd8 disk 4GB no no mpt
syspo~/swap zvol 768.0MB syspool no no
2) My Pools:
volume: data
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
raidz1 ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
errors: No known data errors
volume: syspool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
syspool ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0
errors: No known data errors
3) Add the cache device to syspool:
zpool add -f syspool cache c1t4d0s2
r...@nexenta:/volumes# zpool status
pool: data
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
raidz1 ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
errors: No known data errors
pool: syspool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
syspool ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0
cache
c1t4d0s2 ONLINE 0 0 0
errors: No known data errors
4) Do I/O on the data volume and watch if the l2arc is filled with "zpool
iostat":
cmd:
cd /volumes/data
iozone -s 1G -i 0 -i 1 (for I/O)
Typically looks like this:
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
data 1.47G 58.0G 0 131 0 9.47M
raidz1 1.47G 58.0G 0 131 0 9.47M
c1t1d0 - - 0 100 0 8.45M
c1t2d0 - - 0 77 0 4.74M
c1t3d0 - - 0 77 0 5.48M
---------- ----- ----- ----- ----- ----- -----
syspool 1.87G 6.06G 2 0 23.8K 0
c1t0d0s0 1.87G 6.06G 2 0 23.7K 0
cache - - - - - -
c1t4d0s2 95.9M 3.89G 0 0 0 127K
---------- ----- ----- ----- ----- ----- -----
5) Do the same I/O on the syspool:
cd /volumes
iozone -s 1G -i 0 -i 1 (for I/O)
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
data 407K 59.5G 0 0 0 0
raidz1 407K 59.5G 0 0 0 0
c1t1d0 - - 0 0 0 0
c1t2d0 - - 0 0 0 0
c1t3d0 - - 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
syspool 2.35G 5.59G 0 167 6.25K 14.2M
c1t0d0s0 2.35G 5.59G 0 167 6.25K 14.2M
cache - - - - - -
c1t4d0s2 406M 3.59G 0 80 0 9.59M
---------- ----- ----- ----- ----- ----- -----
6) You see only if I/O to syspool is done, the l2arc in syspool used.
Release is build 104 with some patches.
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