[OSM-dev] MySQL backup

Nick Hill nick at nickhill.co.uk
Mon Jan 15 15:52:37 GMT 2007

Hello Andreas

What sort of overhead does LVM introduce to I/O?

We take backup snapshots for the database every Friday and Tuesday. The database 
is off-line for around 4-6 minutes while this is done.

We could automate a process whereby the backup is copied to another machine then 
a planet.osm made from it.

Steve, does the generation of planet files generally go smoothly, what is the 
exact process you use to make planet dumps? Do you think it'll be a good idea to 
automate the process on cron?

Andreas Brauchli wrote:
> i don't know if this is still an issue on osm but today i stumbled over
> this while reading freshmeat:
> http://freshmeat.net/projects/mylvmbackup/?branch_id=65575&release_id=245089
> mylvmbackup is a Perl script for quickly creating backups of a MySQL
> server's data files. To perform a backup, mylvmbackup obtains a read lock
> on all tables and flushes all server caches to disk, makes an LVM snapshot
> of the volume containing the MySQL data directory, and unlocks the tables
> again. The snapshot process takes only a small amount of time. When it is
> done, the server can continue normal operations while the actual file
> backup proceeds.
> could that be a viable option for backup and weekly-dump?
> you could then start the weekly dump from the backup from another box.
> andreas
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