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RE: backup system for RHEL



You could extend the volume group by creating another physical volume (using fdisk if you've got spare disk), then extending your volume group using the
New physical volume.

Are your Xen images LVs or partitions?

If they're LVs, then you have to do as I suggested (with a snapshot). If they're partitions, just use dd.

-----Original Message-----
From: redhat-list-bounces redhat com [mailto:redhat-list-bounces redhat com] On Behalf Of ESGLinux
Sent: Friday, 24 July 2009 10:11 p.m.
To: General Red Hat Linux discussion list
Subject: Re: backup system for RHEL

2009/7/24 TYURIN Aleksey <Aleksey TYURIN raiffeisen ru>

> Hi
>
> To create the snapshot you need to have enough unpartitioned space in LVM
> value group.
> Alternatively, you can take this space from exists LVM-logical volume to
> valume group
>
> umount /dev/VolGroup00/LogVol00
>
> resize_reiserfs -s-1G /dev/VolGroup00/LogVol00
> (for riserfs)
> or
> resize2fs /dev/VolGroup00/LogVol00 18G
> (for ext3)
>
> lvreduce -L-1G /dev/VolGroup00/LogVol00
> mount /dev/VolGroup00/LogVol00
>
> Can you show?:
> vgdisplay
>

yes of course:

vgdisplay
  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               19,06 GB
  PE Size               32,00 MB
  Total PE              610
  Alloc PE / Size       610 / 19,06 GB
  Free  PE / Size       0 / 0
  VG UUID               nlbCIt-jUrq-d0qk-pnN8-tM90-B3w1-0vVVEL


The fs is ext3.

I´m going to try to reduce the filesystem as you suggested.

One thing, what happens If I dont use LVM at all, (I  have a lot of system
with out it). How can I make a snapshot of a Xen Image?

Greetings,

ESG



>
>
> ??
>
> -----Original Message-----
> From: redhat-list-bounces redhat com [mailto:
> redhat-list-bounces redhat com] On Behalf Of ESGLinux
> Sent: Friday, July 24, 2009 10:40 AM
> To: General Red Hat Linux discussion list
> Subject: Re: backup system for RHEL
>
> Hi,
> this sounds interesting, I didn´t know the -s option of lvcreate.
> I have a problem with this. In my VG I haven´t free space. When I run the
> command:
>
>  lvcreate -s -L 1G -n MySnap1 /dev/VolGroup00/LogVol00
>  Insufficient free extents (0) in volume group VolGroup00: 32 required
>
> I have this:
>
> /dev/mapper/VolGroup00-LogVol00
>                      19360436  13805512   4555620  76% /home
>
> and lvdisplay:
>  lvdisplay
>  --- Logical volume ---
>  LV Name                /dev/VolGroup00/LogVol00
>  VG Name                VolGroup00
>  LV UUID                8BRqMo-K9g5-2Pym-SZfS-Wte3-ZMvM-cqYMCv
>  LV Write Access        read/write
>  LV Status              available
>  # open                 1
>  LV Size                19,06 GB
>  Current LE             610
>  Segments               2
>  Allocation             inherit
>  Read ahead sectors     auto
>  - currently set to     256
>  Block device           253:0
>
>
> what can I do in this situation? I´m not an expert with LVM
>
> Thanks
>
> ESG
>
>
>
>
>
> 2009/7/23 Geofrey Rainey <Geofrey Rainey tvnz co nz>
>
> > Oh and by the way, after the dd is finished you can lvremove the
> > snapshot file.
> >
> > -----Original Message-----
> > From: redhat-list-bounces redhat com [mailto:
> > redhat-list-bounces redhat com] On Behalf Of Geofrey Rainey
> > Sent: Friday, 24 July 2009 9:16 a.m.
> > To: General Red Hat Linux discussion list
> > Subject: RE: backup system for RHEL
> >
> > I use Xen snapshot like so:
> >
> > 1. create a snapshot file - this can probably be quite small
> > (depending on usage but 1G is probably enough)
> >
> > lvcreate -s -L 1G -n <name of snapshot>
> > /dev/<volume_group>/<logical_volume_name>
> >
> > 2. then backup your partition with something like this:
> >
> > dd if=/dev/<volume_group>/<name of snapshot> of=<path/lvm_backup.img>
> > bs=1M
> >
> > 3. if you need to restore, do the following:
> >
> > dd if=< path/lvm_backup.img
> > of=/dev/<volume_group>/<logical_volume_name>
> >
> > Of course you'll need as much space as the original partition for this
> > but that's the only solution I think.
> >
> >
> >
> > -----Original Message-----
> > From: redhat-list-bounces redhat com [mailto:
> > redhat-list-bounces redhat com] On Behalf Of ESGLinux
> > Sent: Friday, 24 July 2009 12:46 a.m.
> > To: General Red Hat Linux discussion list
> > Subject: Re: backup system for RHEL
> >
> > Thanks for your answer,
> > I´ll take a look at openfiler, it looks great.
> >
> > One question, how do I make a Xen snapshot? With vmware I see the
> > option, but with Xen not.
> >
> > any help?
> >
> > thanks,
> >
> > ESG
> >
> >
> > >
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