Simon,
Thanks for the info, that is very useful. I still have a few questions
though...I am considering setting up a 200GB LVM partition for the mysql
data and a 70 GB LVM partition for the snapshots.
Am I able to store several snapshots on the 70 GB partition? or do I
need to take one snapshot and then move it..take another one then move it?
Also...if anyone else is doing this...how often are you taking the
snapshots...every 5 minutes, every hour, every 12 hours, etc?
Thanks,
Shain
Simon J Mudd wrote:
> smiley@stripped (Shain Miley) writes:
>
>
>> I am trying to plan we in advance our methods for backup and recovery
>> of our new MySQL replication cluster. After doing some research it
>> looks like a lot of people are using LVM snapshots as their backup
>> solution. We currently have two MySQL servers with 2 300 GB (Raid 1).
>> What I am confused about is the best disk layout to use at this point.
>>
>> Do I need to create a separate volume for the snapshots? Can anyone
>> provide any suggestions on disk layout for two disks of this size?
>>
>
> The filesystem layout is largely irrelevant. Basically what you want
> is to have all your mysql files on a separate LVM filesystem. So you
> could do this by creating a new filesystem and mounting it at
> /var/lib/mysql. Then install MySQL.
>
> Once you have the filesystem mounted you can use mysql as normal.
>
> To take snapshots do the following:
>
> 1. stop mysql
> 2. make a snapshot LV of the volume mounted at /var/lib/mysql
> 3. start mysql
> 4. mount the snapshot and back it up to a real filesystem or to tape or whatever.
> 5. unmount the snapshot and remove it.
>
> 4. Is very important as if you don't do this eventually the snapshot
> will run out of space and suddenly it will lose its contents. It's
> only a temporary staging area.
>
> Hope this helps.
>
> Simon
>
>
>
