[Xen-users] RE: iSCSI and LVM

["Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>]

You can use live migration in such setup, even safely if you back it by
clvm.  You can even live without clvm if you deactivate your VG on all
but a single dom0 before changing the LVM metadata in any way.  A
non-clustered VG being active on multiple dom0s isn't a problem in
itself and makes live migration possible, but you'd better understand
what you're doing.

> Can you please explain to me how my plan is ambitious? Can someone
> please suggest where I should cut down/ scale up?

Even 100 domUs on a single dom0 is quite a lot.  100 Mbit/s upstream
bandwidth isn't much.  You'll have to tune your iSCSI carefully to
achieve reasonable I/O speeds, which is limited by your total storage
speed.  Even if your domUs don't do much I/O, 128 MB of memory is pretty
much a minimum for each, 128 of those require 16 GB of dom0 memory (this
is probably the easiest requirement to accomodate).
------------------------------------------------------------------------------------------------

 

Can you please explain the steps I would need to take in order to connect multipl clients to a single iSCSI target? I was thinking of using LVM on the storage server to split my RAID array in 2 big LVs, and then export one LV to a node. Then the xen node would use LVM within this exported LV. to split it up into small LVs for the DomUs. Is this a good or bad idea?

 

The 100 Mbit/s upstream is for the internet connection. The bandwidth to the iSCSI server is dual bonded gigabit ethernet. What tuning could i do to the iSCSI setup?

 

Thanks

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users