RE: backup system for RHEL

Hmm. I'd be inclined to free up a small amount of space on that volume group by shrinking firstly the file-system, then the LV - you probably only need
To reclaim 100M - best to backup important stuff on /home in case you wreck
The file-system (unlikely). Alternatively, do you have any space left on the
Disk that you can add to the VG? (look at fdisk) - basically you need to get
More space from somewhere to create a snapshot - perhaps you could also install more disk?

-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of ESGLinux
Sent: Friday, 24 July 2009 6:40 p.m.
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@xxxxxxxxxx>

Oh and by the way, after the dd is finished you can lvremove the snapshot
file.

-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:
redhat-list-bounces@xxxxxxxxxx] 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@xxxxxxxxxx [mailto:
redhat-list-bounces@xxxxxxxxxx] 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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