On Jun 16, 2009, at 17:47, Scott Meilicke wrote:
I think (don't quote me) that ESX can only mount 64 iSCSI targets,
so you aren't much better off. But, COMSTAR (2009.06) exports a
single iSCSI target with multiple LUNs, so that gets around the
limitation. I could be all wet on this one, however, so look into it
before taking my word.
Version 3.5 of the various VMware software has a one-connection-per-
target limit (page 18):
ESX Server‐based iSCSI initiators establish only one connection to
each target. This means storage systems with a single target
containing multiple LUNs have all LUN traffic on that one
connection. With a system that has [say] three targets with one LUN
each, three connections exist between an ESX Server and the three
volumes available.
http://www.vmware.com/pdf/vi3_35/esx_3/r35/vi3_35_25_iscsi_san_cfg.pdf
The iSCSI driver used by ESX Server does not currently use multiple
connections per session, so there are no such settings that you can
tune.
http://www.vmware.com/files/pdf/iSCSI_design_deploy.pdf
This may impact how much throughput you can get, as well as any MPIO
scenarios you want to use. There's also a maximum of 8 (?) targets
that can be connected to:
http://www.vmware.com/pdf/vi3_iscsi_cfg.pdf
There's a good explanation of how VMware's iSCSI system works (at
least for 3.x):
http://tinyurl.com/dd4com
http://virtualgeek.typepad.com/virtual_geek/2009/01/a-multivendor-post-to-help-our-mutual-iscsi-customers-using-vmware.html
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