On Mon, Sep 21, 2009 at 03:55:33PM -0400, William wrote:
> Hi Pasi,
> Can I have more information about your topology ?
> - Number of physical and virtual servers per SAN (if it's possible).
It depends what you mean with SAN.. With Equallogic storage arrays you can
combine multiple arrays into a 'group', so you can scale the setup that
way. Volumes will be distributed across the members of the group and
automatically loadbalanced (unless you want to manually configure things).
> With Equallogig by Dell, there is two controllers but 1 active an 1
> passive, so if I understand, you have bonded all NIC (3) by controller
> to obtain 3 Gbit/sec?
Yes, Equallogic is active/standby. If the primary (active) controller fails, the
secondary (standby) controller takes over all the connections.
You don't do bonding with Equallogic. Instead you use multiple NICs and
the initiator to get n*1Gbit/sec. Equallogic storage array will redirect iSCSI
to different ports, and loadbalance the sessions this way.
So if you want to get 3 Gbit/sec to your server, it needs to have 3
gigabit NICs and you create a session/path from each NIC to the storage,
and then use dm-multipath to combine the paths.
> Pasi Kärkkäinen wrote:
> >On Mon, Sep 21, 2009 at 02:07:59PM -0400, William wrote:
> >>I'm looking information about SAN storage.
> >>In my case, I want to use 3 physical servers and 1 SAN to manage 10-15
> >>virtual servers.
> >>What is the best solution : ISCSI (1Gb/s) or Fibre Channel (4Gb/s)?
> >I've been using Equallogic iSCSI SAN storage for years without problems.
> >It's n*1 Gbit/sec, you can scale it with multiple NICs and dm-multipath.
> >I don't see any reason to go for FC nowadays, unless you have some special
> >>What kind of device are you using ?
> >Equallogic PS series arrays.
> >-- Pasi
> >Xen-users mailing list
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