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Re: backup system for RHEL



2009/7/24 Geofrey Rainey <Geofrey Rainey tvnz co nz>

> 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.


I have some with LVs and some in partitions.

I have systems with a directory /home/images an there several images, how I
do a backup of one image in particular?

dd if=/home/images/? of=? bs=1M

thanks,

ESG



>
>
> -----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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