backup system for RHEL
Geofrey Rainey
Geofrey.Rainey at tvnz.co.nz
Fri Jul 24 10:25:00 UTC 2009
For the Xen images made of partitions, you'd do:
# dd if=/dev/sda? of=/backup/xen-backup-image.img bs=1M
(where /dev/sda? is the partition which your /etc/xen/<xen-config>:disk='phy:.....' refers to.
Make sense?
-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of ESGLinux
Sent: Friday, 24 July 2009 10:18 p.m.
To: General Red Hat Linux discussion list
Subject: Re: backup system for RHEL
2009/7/24 Geofrey Rainey <Geofrey.Rainey at 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 at redhat.com [mailto:
> redhat-list-bounces at 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 at 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 at redhat.com [mailto:
> > redhat-list-bounces at 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 at 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 at redhat.com [mailto:
> > > redhat-list-bounces at 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 at redhat.com [mailto:
> > > redhat-list-bounces at 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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