[PVE-User] WG: DRBD+ Proxmox2.1 + Debian Squeeze

[Muhammad Yousuf Khan]

On Tue, Aug 28, 2012 at 1:40 PM, Holger Ernst <he at ernstdatenmedien.de> wrote:
> When syncing running vms you should be aware that this may lead to
> unpredictable state of operation system and/or applications.
> First you should use a snapshot prior to sync to avoid corrupt
> filesystem or data.
> Then you have to be aware that starting a snapshot of a running system
> is like switching a running machine off and on again.
> So make sure the os can handle that.

Thanks for sharing. but what if i use DRBD isnt it like switching
machine off and on when my primary base machine goes down ?

as per my very limited knowlege. DRBD is also kind of a mirror b/w two
computer or Raid 1.  in Rsync the problem is that i have to do it
manually every hour and in DRBD the changes are updated instantly.

please correct me if i understand some thing wrong .......




>
> regards, holger
>
>> Betreff: Re: [PVE-User] DRBD+ Proxmox2.1 + Debian Squeeze
>>
>> since i am not that advance user to use DRBD i found Rsync relatively
>> easy. please if this is a wrong approach then kindly let me know.
>>
>> i am running 7 to 8 VMs (KVM). on a server that has 8 GB of RAM.
>> atleast 1 GB RAM is almost free.
>>
>> all the VMs are almost b/w 30 to 50 GB size.
>>
>> is that a good idea that i rsync 8 VMs on hourly basis via scheduler.
>> is it going to impact on RAM or Processor?
>>
>> LAN is not a problem i'll add another LAN Card just for rsync.
>>
>> any advice or suggestion would be appreciated.
>>
>> Thanks,
>>
>>
>>
>>
>> On Mon, Aug 27, 2012 at 3:17 PM, admin extremeshok.com
>> <admin at extremeshok.com> wrote:
>> > GlusterFS would be better suited for 3 or more servers.
>> >
>> > We have been using it in production for 1year, with excellent
> results.
>> >
>> > On 2012/08/27 11:12 AM, Martin Maurer wrote:
>> >>> Subject: Re: [PVE-User] DRBD+ Proxmox2.1 + Debian Squeeze
>> >>>
>> >>> Thanks, ill read this. for new bie like me :) its kinda seems hard
> to understand
>> >>> but ill learn it with no problem,
>> >>>
>> >>> but there is a question of mine. since Proxmox team highly
> supporting DRBD.
>> >>> i have seen this in last version 1.9 and now in 2.1.
>> >>>
>> >> [Martin Maurer]
>> >> No, we do not "highly support" DRBD. This is for expert use only.
>> >>
>> >>> i was talking to a guys in mailing list they were building
> openfiler with HW
>> >>> RAID1 as a SAN solution for virtualization.
>> >>>
>> >>> so my question is, why proxmox team dont promote openfiler or
> open-iscsi
>> >>> as a cheap back end? is there any stability issue or some thing. i
> know there
>> >>> are pros and cons for every project/product however just to clear
> my
>> >>> concept i am asking this.
>> >> [Martin Maurer]
>> >> Openfiler is a SAN distribution, among many others - no problem to
> use with Proxmox VE.
>> >>
>> >> DRBD is a replication software - mirroring block devices via
> network. (e.g. Openfiler can use
>> DRBD to replicate two Openfilers to the Openfiler HA)
>> >>
>> >> Martin
>> >>
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