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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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