Hi.
snv_44, v440
filebench/varmail results for ZFS RAID10 with 6 disks and 32 disks.
What is suprising is that the results for both cases are almost the same!
6 disks:
IO Summary: 566997 ops 9373.6 ops/s, (1442/1442 r/w) 45.7mb/s,
299us cpu/op, 5.1ms latency
IO Summary: 542398 ops 8971.4 ops/s, (1380/1380 r/w) 43.9mb/s,
300us cpu/op, 5.4ms latency
32 disks:
IO Summary: 572429 ops 9469.7 ops/s, (1457/1457 r/w) 46.2mb/s,
301us cpu/op, 5.1ms latency
IO Summary: 560491 ops 9270.6 ops/s, (1426/1427 r/w) 45.4mb/s,
300us cpu/op, 5.2ms latency
Using iostat I can see that with 6 disks in a pool I get about 100-200 IO/s per
disk in a pool, and with 32 disk pool I get only 30-70 IO/s per disk in a pool.
Each CPU is used at about 25% in SYS (there're 4 CPUs).
Something is wrong here.
# zpool status
pool: zfs_raid10_32disks
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zfs_raid10_32disks ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t16d0 ONLINE 0 0 0
c3t17d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t18d0 ONLINE 0 0 0
c3t19d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t20d0 ONLINE 0 0 0
c3t21d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t22d0 ONLINE 0 0 0
c3t23d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t24d0 ONLINE 0 0 0
c3t25d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t26d0 ONLINE 0 0 0
c3t27d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t32d0 ONLINE 0 0 0
c3t33d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t34d0 ONLINE 0 0 0
c3t35d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t36d0 ONLINE 0 0 0
c3t37d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t38d0 ONLINE 0 0 0
c3t39d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t40d0 ONLINE 0 0 0
c3t41d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t42d0 ONLINE 0 0 0
c3t43d0 ONLINE 0 0 0
errors: No known data errors
bash-3.00# zpool destroy zfs_raid10_32disks
bash-3.00# zpool create zfs_raid10_6disks mirror c3t42d0 c3t43d0 mirror c3t40d0
c3t41d0 mirror c3t38d0 c3t39d0
bash-3.00# zfs set atime=off zfs_raid10_6disks
bash-3.00# zfs create zfs_raid10_6disks/t1
bash-3.00#
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