I finally have finished Xenserver build with Multipath in place. But still struggling with performance.
FreeNAS setup (2 nics, 2 different subnets):
1 portal - listening on 10.1.0.1 and 10.2.0.1
1 extent (2T)
XenServer iSCSI setup:
[root@accxen01 boot]# iscsiadm -m session
tcp: [3] 10.1.0.1:3260,3 iqn.2011-03.org.accsan1.istgt:accnas02 (non-flash)
tcp: [4] 10.2.0.1:3260,3 iqn.2011-03.org.accsan1.istgt:accnas02 (non-flash)
[root@accxen01 boot]# multipath -ll
36589cfc00000009e65ba89b64650b625 dm-1 FreeBSD,iSCSI Disk
size=1.8T features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 24:0:0:0 sdc 8:32 active ready running
`- 23:0:0:0 sdb 8:16 active ready running
/etc/multipathf.conf
device {
vendor "FreeBSD"
product "iSCSI Disk"
path_grouping_policy multibus
path_selector "round-robin 0"
rr_min_io 100
}
I am getting only 67MB/s Write and 75MB/s Read rate. I was expecting, at least, twice this speed, since it's a multipath with 2 nics.
At last, when I run traceroute from FreeNAS to Xenserver IPs, I am getting following result:
traceroute to 10.1.0.2 (10.1.0.2), 64 hops max, 52 byte packets
1 10.1.0.2 (10.1.0.2) 0.113 ms !Z 0.095 ms !Z 0.087 ms !Z
What '!Z' means? Is that a problem?
FreeNAS setup (2 nics, 2 different subnets):
1 portal - listening on 10.1.0.1 and 10.2.0.1
1 extent (2T)
XenServer iSCSI setup:
[root@accxen01 boot]# iscsiadm -m session
tcp: [3] 10.1.0.1:3260,3 iqn.2011-03.org.accsan1.istgt:accnas02 (non-flash)
tcp: [4] 10.2.0.1:3260,3 iqn.2011-03.org.accsan1.istgt:accnas02 (non-flash)
[root@accxen01 boot]# multipath -ll
36589cfc00000009e65ba89b64650b625 dm-1 FreeBSD,iSCSI Disk
size=1.8T features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 24:0:0:0 sdc 8:32 active ready running
`- 23:0:0:0 sdb 8:16 active ready running
/etc/multipathf.conf
device {
vendor "FreeBSD"
product "iSCSI Disk"
path_grouping_policy multibus
path_selector "round-robin 0"
rr_min_io 100
}
I am getting only 67MB/s Write and 75MB/s Read rate. I was expecting, at least, twice this speed, since it's a multipath with 2 nics.
At last, when I run traceroute from FreeNAS to Xenserver IPs, I am getting following result:
traceroute to 10.1.0.2 (10.1.0.2), 64 hops max, 52 byte packets
1 10.1.0.2 (10.1.0.2) 0.113 ms !Z 0.095 ms !Z 0.087 ms !Z
What '!Z' means? Is that a problem?