Rechenberg, Andrew wrote:
We actually used to backup our data in this fashion, but we used a
triple mirror. We had three hardware RAID arrays and then we used Linux
software RAID to mirror those three (i.e. /dev/hdc1, /dev/hdd1, and
/dev/hde1). At night we used mdadm to break the mirror, mount the
removed partition and backup, and then add the partition back in and
re-mirror.
Exactly what we do now.
The database is unavailable for less than 1 minute while the snapshot is
taken (it actually takes less than 10 seconds to snapshot ~360GB, the
other time is just the script sleeping, making sure all transactions
complete). This solution ensures a consistent database, while also
having near-line backups available on disk.
I'm assuming the snapshot it the same size as the FS to backup. What if
you don't have enough disk space to do this?
--
Anthony Mayes
UNIX Server Administration
Southern Illinois University Edwardsville
anmayes@siue.edu
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