Just wanted to add that I'm in the exact same boat - I'm connecting from a
Windows system and getting just horrid iSCSI transfer speeds.
I've tried updating to COMSTAR (although I'm not certain that I'm actually
using it) to no avail, and I tried updating to the latest DEV version of
OpenSolaris. All that resulted from updating to the latest DEV version was a
completely broken system that the I couldn't access the command line on.
Fortunately i was able to roll back to the previous version and keep tinkering.
Anyone have any ideas as to what could really be causing this slowdown?
I've got 5-500GB Seagate Barracuda ES.2 drives that I'm using for my zpools,
and I've done the following.
1 - zpool create data mirror c0t0d0 c0t1d0
2 - zfs create -s -V 600g data/iscsitarget
3 - sbdadm create-lu /dev/zvol/rdsk/data/iscsitarget
4 - stfadm add-view xxxxxxxxxxxxxxxxxxxxxx
So I've got a 500GB RAID1 zpool, and I've created a 600GB sparse volume on top
of it, shared it via iSCSI, and connected to it. Everything works stellar up
until I copy files to it, then I get just sluggishness.
I start to copy a file from my windows 7 system to the iSCSI target, then pull
up IOSTAT using this command : zpool iostat -v data 10
It shows me this :
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
data 895M 463G 0 666 0 7.93M
mirror 895M 463G 0 666 0 7.93M
c0t0d0 - - 0 269 0 7.91M
c0t1d0 - - 0 272 0 7.93M
---------- ----- ----- ----- ----- ----- -----
So I figure, since ZFS is pretty sweet, how about I add some additional drives.
That should bump up my performance.
I execute this :
zpool add data mirror c1t0d0 c1t1d0
It adds it to my zpool, and I run IOSTAT again, while the copy is still running.
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
data 1.17G 927G 0 738 1.58K 8.87M
mirror 1.17G 463G 0 390 1.58K 4.61M
c0t0d0 - - 0 172 1.58K 4.61M
c0t1d0 - - 0 175 0 4.61M
mirror 42.5K 464G 0 348 0 4.27M
c1t0d0 - - 0 156 0 4.27M
c1t1d0 - - 0 159 0 4.27M
---------- ----- ----- ----- ----- ----- -----
I get a whopping extra 1MB/sec by adding two drives. It fluctuates a lot,
sometimes dropping down to 4MB/sec, sometimes rocketing all the way up to
20MB/sec, but nothing consistent.
Basically, my transfer rates are the same no matter how many drives I add to
the zpool.
Is there anything I am missing on this?
BTW - "test" server specs
AMD dual core 6000+
2GB RAM
Onboard Sata controller
Onboard Ethernet (gigabit)
I've got a very similar rig to the OP showing up next week (plus an infiniband
card) I'd love to get this performing up to GB Ethernet speeds, otherwise I may
have to abandon the iSCSI project if I can't get it to perform.
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