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RE: backup system for RHEL



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


??

-----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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