I'm testing an Iscsi multipath configuration on a T2000 with two disk
devices provided by a Netapp filer. Both the T2000 and the Netapp
have two ethernet interfaces for Iscsi, going to separate switches on
separate private networks. The scsi_vhci devices look like this in
`format':
1. c4t60A98000433469764E4A413571444B63d0 <NETAPP-LUN-0.2-50.00GB>
/scsi_vhci/[EMAIL PROTECTED]
2. c4t60A98000433469764E4A41357149432Fd0 <NETAPP-LUN-0.2-50.00GB>
/scsi_vhci/[EMAIL PROTECTED]
These are concatenated in the ZFS pool. There are two network paths
to each of the two devices, managed by the scsi_vhci driver. The pool
looks like this:
# zpool status
pool: space
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
space ONLINE 0 0 0
c4t60A98000433469764E4A413571444B63d0 ONLINE 0 0 0
c4t60A98000433469764E4A41357149432Fd0 ONLINE 0 0 0
errors: No known data errors
The /kernel/drv/scsi_vhci.conf file, unchanged from the defaut, specifies:
load-balance="round-robin";
Indeed, when I generate I/O on a ZFS filesystem, I see TCP traffic with
`snoop' on both of the Iscsi ethernet interfaces. It certainly appears
to be doing round-robin. The I/O are going to the same disk devices,
of course, but by two different paths. Is this a correct configuration
for ZFS? I assume it's safe, but I thought I should check.
--
-Gary Mills- -Unix Support- -U of M Academic Computing and Networking-
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