Hi Tom - Currently we don’t have any doc's on the XEN systems only with the Virtual Iron from the link below on how to set this up. This was given to us by one of our customers.
For MPIO with Microsoft we have a short how to that explains that each NIC must be on a separate subnet this is all that is needed to do on our end. If you have many NIC's in the system you can bond 2 NICs to create one subnet then repeat for the other.
Basically from my testing/researching last night, I'm not sure DSS will support this for Xen or VMWare (btw Virtual Iron is based on Xen I thought?).
Basically I needs to see the LV/LUN on multiple iSCSI targets, and in DSS I cannot map a Lv/LUN to multiple targets, is this correct?
From the Xenserver docs:
3.3.10. Storage Multipathing
Dynamic multipathing support is available for Fibre Channel and iSCSI storage backends. By default, it uses round-robin mode load balancing, so both routes will have active traffic on them during normal operation. Multipathing can be enabled in XenCenter or on the command line.
Caution
Before attempting to enable multipathing, verify that multiple targets are available on your storage server. For example, an iSCSI storage backend queried for sendtargets on a given portal should return multiple targets, as in the following example:
im fooling a bit with xenserver, it seems like open-e really dosnt report multiple paths to the target, but there is a little manual workaround
first my device in multipath.conf:
device {
vendor "iSCSI"
product "*"
path_grouping_policy multibus
path_checker tur
features "1 queue_if_no_path"
failback immediate
rr_min_io 1000 # try different values, for me 4 seems to work best
path_selector "round-robin 0"
}
since xen allows only to setup one connection to a specific lun, you have to setup another connection manually, for example:
- iscsi target (open-e) on 192.168.0.1/24 and 192.168.1.1/24
- in xencenter activate multipath
- setup SR to 192.168.0.1
- login to xen via ssh
- iscsi login to the 192.168.1.1:
"iscsiadm --mode discovery --type sendtargets --portal 192.168.1.1
iscsiadm --mode node --targetname iqn.2009-04:dss.target0 --portal 192.168.1.1 --login"
at this moment xencenter should report 2 active paths to the SR.. well there should be a way to make it automatic but didnt see in to it yet, also i would suggest to read dm-multipath manual
I added the following config:
# BARRY ADDED
device {
vendor "iSCSI"
product "*"
path_grouping_policy multibus
path_checker tur
features "1 queue_if_no_path"
failback immediate
rr_min_io 4 # try different values, for me 4 seems to work best
path_selector "round-robin 0"
}
device {
vendor "SCST_FIO"
product "*"
path_grouping_policy multibus
path_checker tur
features "1 queue_if_no_path"
failback immediate
rr_min_io 4 # try different values, for me 4 seems to work best
path_selector "round-robin 0"
}
And also:
multipaths {
multipath {
wwid 200000000d11ba481dm-2
alias multipath2
}
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