My $0.02 ...
On 05Mar10, at 00:50 , Edward Ned Harvey wrote:
> To answer your question, we paid for Netbackup, so that's the tool that
> writes our tapes. I understand Amanda or bacula would be viable
> alternatives for less than thousands of dollars, but I've not tried them.
We had an S500 "StoreVault" that began to show signs of deteriorating
performance during backup, which helped us correlate transient issues reported
by users.
This ~4TB unit turned out to have 25 million files on it, which seemed to,
ahem, explain most of those problems.
We were using Bacula, writing to DLT-S4 tape. Generally, we would see a maximum
of 24MB/sec throughput to tape - this was using a Bacula job that took the
output of the filer 'dump' program, piped via rsh, and included encryption
performed on the backup server and then writing to tape. We used this dump
approach for "CIFS-Native" filesystems on the StoreVault in order to preserve
as much of the Windows metadata as possible; the rest were done via NFS mounts.
Amen on the issues with large deleted files and snapshots, but I was too late
setting up quotas (for numbers of files, not space usage) to prevent a
meltdown. Although it's intuitively obvious to people that one can't fit 50GB
of data on a 25GB disk, sometimes it's difficult to convince them that too many
files in a filesystem cause issues.
All conventional Bacula clients had encryption configured, so unless a
filesystem was mounted on the server, everything coming off the client was
secure. This did not, of course, include the NetApp, where encryption was done
on the Bacula server.
_KMP
--
K. M. Peterson voice: +1 617 731 6177
Boston, Massachusetts, USA fax: +1 206 338 6427
Full contact information at http://kmpeterson.com/contact.html
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