Hi
>> I am going to get a storage server which will
be connected to my Xen
>> hosts via iSCSI/Ethernet. I wish to use LVM
for the DomU disks. The
>> storage server will have a RAID10 array, and
2 Xen hosts will connect
>> to this (Each will have a 50% share of the
RAID10 array, space wise).
>>
>> What is the best way to go
about this? Should I:
>>
>> a) Split the RAID10 array into 2
partition on the storage server, and
>> export 1 partition to each xen
host, then let the Xen host manage LVM?
>>
>>
or
>>
>> b) Do all LVM stuff on the storage server and export
each LVM logical
>> volume to the correct Xen hosts via iSCSI? Since
each host could have
>> around 100 VMs on it, that's a lot of iSCSI
exporting!
>>
> If you export two "big luns" and do the LVM stuff
on each Xens server
> you will not be able to "switch" a VM from one
server to the other (with
> xm save/restore for example). With that setup
a VM can only be started
> on a specific server. Also you will have two
LVM sets to manage.
>
> If you do all the storage management on your
SAN migrate a VM from one
> server to the other will be easy and even done
"live". Also the storage
> management will be "unified". The only problem
could be the maximum
> number of iSCSI Luns on yours SAN, but it often is
greater than 127
> distinct units.
>
> Ok thanks for the
advice. So I think I shall go down the root of doing all
> LVM stuff on
the SAN.
>
> However, I think that I will need more than 127 virtual
machines, so having
> an iSCSI target per VM is probably not an
option. Is there any other
> solution for Ubuntu/Debian?
Would
it be an option to have one iSCSI target, used by multiple
clients where only
one clients accesses a directory at a time??
that way it would be way easier
to mgrate a vm from one host to another.
HTH
Regards,
Serge
Fonville
--
http://www.sergefonville.nl
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So you're saying that I could just have one bug LUN, which both
xen hosts could connect to, and as long as each host didn't try to run the same
DomU as the same time, I'd be ok? Is this safe and done in
industry?
