Re: [Xen-users] XEN infrastructure setup question

[George Shuklin <george.shuklin@xxxxxxxxx>]

I just want to note that snapshots in LVM are reverse-differential, so
every write operation will write to every snapshot (5 snapshots, 6 write
operations instead one).

In product environment under high load this can cause a huge impact on
IO performance.

Ð ÐÑÐ, 03/08/2011 Ð 17:49 +0200, Christian Motschke ÐÐÑÐÑ:
> Am 03.08.2011 um 17:01 schrieb Javier Guerra Giraldez:
> 
> > On Sat, Jul 30, 2011 at 1:39 AM, Abilash Praveen [Consign IT Private
> > Limited] <abilash@xxxxxxxxxxxxxx> wrote:
> >> 1) How many VMs can I run?
> > 
> > unanswerable, as it totally depends on your needs.  the box is on the
> > smallish side, however.
> > 
> >> 2) How do I go about LVM and also use RAID 1?
> > 
> > do a RAID, then set it as a PV, create a VG, then split on your LVs
> 
> Or put 2 PVs in 1 VG and create the LVs as mirror (lvcreate -m 1 â)
> 
> > 
> >> 3) How do I backup VMs (snapshots?)
> > 
> > install backup clients on the VMs
> 
> Or you can make a snapshot, check the filesystem of the snapshot, mount the 
> snapshot and use a backup tool or dd the snapshot to another disk. You can 
> find backup scripts for this.
> http://www.cduce.org/~abate/files/xenBackup.txt
> 
> > 
> >> 4) I am also looking at Eucalyptus for future offering. My understanding is
> >> that with Eucalyptus, I can group different bare metals into a single cloud
> >> - i.e, 2 x quad core process, 2 x 8 GB RAM will now become a 2 quad core
> >> with 16 GB RAM cloud and the VMs can be installed into this cloud. Please
> >> correct me if I'm wrong.
> > 
> > 'cloud' isn't a magic word.  Eucalyptus just simplifies management and
> > resource allocation.  Each VM still reside on a single box, but if
> > done correctly you don't have to care exactly which.
> > 
> > -- 
> > Javier
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> 
> 
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