What would reasonable speed expectations be for iSCSI (software initiator)?
Gig for gig speeds close to that Fibre Channel? Better? Worse? I ask because my numbers are coming back very odd, and I'm wondering if they indicate any sort of setup problem.
The read speeds I'm seeing for 1GB iSCSI are all over 72% of what I see for 4GB FC, but for write speeds I'm seeing between 11% down to 0.1% .
I know all systems and setups are different, so to put it in context, I tested on a server with local hardware RAID, 2x 4GB FC HBAs and a dedicated 1GB ethernet port for iSCSI.
The FC connection is multipathed round-robin using the native device-mapper-multipath tools.
Unfortunately I'm running CentOS 4.8, so I can't multipath on iSCSI.
I ran iozone against the local raid, the FC mount and the iSCSI mount all the same way:
iozone -r 8k -g8G -+u -Ra
(posting the 4gig lines, since I'm still waiting on it to finish the 8gig on the iscsi mount)
Code:
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
Raid 4194304 8 986134 2097384 3906747 4450567 3560883 2125435 3439691 5253393 3723229 933400 1671224 3393054 4030438
FC 4194304 8 886866 1843087 3912833 4474970 3473664 2089719 3379028 5253480 3622934 915985 1836684 3911465 4598865
iSCSI 4194304 8 98096 99097 2853439 3247237 2669589 2922 2419398 3469535 2718208 22577 96270 2982419 3601309
Thanks
--Kyle
