Re: [Xen-users] moving LV's devices to a SAN server.

[Israel Garcia <igalvarez@xxxxxxxxx>]

Hi fajar,

On 11/2/09, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
> On Sat, Oct 31, 2009 at 12:00 AM, Israel Garcia <igalvarez@xxxxxxxxx> wrote:
>> I have, untested, a way to move lv's from an old  VG to a newone remote
>> VG:
>> cat /dev/VG1_dom0/lv1 | ssh  storage "cat > /dev/VG2_storage/lv1"
>> So,  at the end I should have all lv's devices in the storage server.
>
> I prefer "dd" instead of "cat", but basically anything that can
> transfer the content of a block device or file should do.
>
>>
>> final questions:
Hi fajar,

>>
>> do you know if it works? I mean if domU starts without problems using
>> this devices attached?
>
> If you copy the storage (dd, cat, etc.) while domU is shut down then
> it should generally work.
Ok..

>
>> is there another better way to move several domU's storages to a SAN
>> server?
>
> "better" is in the eye of the beholder :D
> For example, if the domU is windows, I prefer to dd the first 512byte
> of disk (to copy MBR and partition table) and use ntfsclone
> afterwards. If the domU is Linux I prefer to use mkfs + tar/rsync.
> It's more efficient in terms of data transfer, but adds complexity
> somewhat.
Ok...

>
>> do you think it's a good idea to use crossovers between dom0-SAN
>> instead a switch?
>
> Depends on your setup. If your SAN has lots of ports and you can use
> at least two cables for crossover, it might be best to do so, thus
> eliminating switch as single point of failure. However on normal
> datacenter setups (with lots of servers accessing a SAN) you'd
> probably want to use redundant switch instead.

I asked about using crossover cables because I don't know if a
redudant/switches setup at 1GB ethernet is enough to serve more than
10 dom0 (more than 150 domU) when using the storage thinking in
bottleneck at ethernet level. Note that every domU's storage should be
at the storage server. I'll appreciate any comments if have some
experiences regarding this issue.

thanks for your time.
regards
Israel.
>
> --
> Fajar
>


-- 
Regards;
Israel Garcia

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