Theo Band wrote:
> carlopmart wrote:
>> Hi all,
>>
>> I need to build a NFS CentOS 5.1 based server with LVM and snaphosts
>> for disaster recovering to serve storage to three ESX servers for a
>> development dept. I have 500 GB for storage. Data that I need to store
>> on this server is 150 GB and can grow to 210 GB to the end of year ...
>>
>> My questions are:
>>
>> - Is it possible to do some type of scripting to do data snapshots
>> every day and then copy to a remote server?? Some example, please??
> Yes of course. I would suggest to use rsync for that, see the example
> below.
> I have experimented in the past with multiple snapshots a day over a
> week for users home space. The snapshots gave users a way to quickly
> retrieve lost data. Drawback is that snapshots tend to slow down the
> file server (it freezes temporarily to update the snaphot). A temporary
> snapshot during backup works OK.
>>
>> - How can I restore snapshot data on the production server if I need
>> to recover it??
> Most easy way would be to make a snapshot and make this snapshot the
> active disk. If you need to revert, just remove the snapshot and create
> a new one from the original unmodified data. But since you want to use
> NFS, you will have to reboot to free up the snapshot which is not so
> nice. The other way around is also possible. Just rsync the source NFS
> disk from the snapshot.
> Again I would only make a snapshot temporarily and use it to make a copy
> (or sync) to a second file system. This second file system can than be
> setup with multiple snapshots over time. This prevents the slowdown of
> the "main" file server. If you need to revert you can use rsync again.
> (rsync works incrementally so it safes a lot of time if most data is
> still the same)
>
> Example script to run with crontab to synchronize multiple volumes to a
> backup server:
>
> date +"$0 started: %x %T"
> PATH=$PATH:/usr/sbin
>
> volumes="vola volb volc vold"
> for i in $volumes
> do
> # Create a new snapshot
> # Maximum snapshot size 7G
> DATE=$(date +%a_%y%m%d_%H%M)
> lvcreate --size 10G -n ${i}_${DATE} --permission r --snapshot
> /dev/VolGroup00/$i
>
> # Mount the snapshot
> mkdir -p /snapshot/${DATE}/$i
> mount -o ro /dev/VolGroup00/${i}_${DATE} /snapshot/${DATE}/$i
>
> rsync -aq --delete /snapshot/${DATE}/$i/ remote_host:/mnt/$i/
>
> umount /snapshot/${DATE}/$i
> rmdir /snapshot/${DATE}/$i
> rmdir /snapshot/${DATE}
> lvremove -f /dev/VolGroup00/${i}_${DATE}
>
> done
> date +"$0 finished: %x %T"
>
>
> You could create daily snapshots on the remote server as well. I use
> (incremental) dump and restore for that.
>
> Cheers,
> Theo
That's what I need. Thanks Theo.
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--
CL Martinez
carlopmart {at} gmail {d0t} com