[Bacula-users] Quantum Scalar i500 slow write speed
2010-08-05 07:28:04
Quote:
Hi
I have a Quantum Scalar i500 and it works in Bacula, but it is very
slow. It writes at 22mb/sec. The drives should be able to do a lot more
then that. I have to backup 11TB that takes a couple of days to
complete, I don't want to think how long it would take to restore Sad
This is the output I get from btape without hardware compression:
* did you enable (at least attribute) spooling?
* with what speed can you actually read the data ? (try to make a tar of
a large directory "time tar -cf /dev/null <path/to/directory>" )
* is the storage daemon on the same machine as the 11tb data?
- Thomas
Hi Thomas
The spooling attribute was not enabled, I have enabled it now. This is what I
get writing to disk and then also writing that file to tape with tar:
This is a 10gb file to disk:
]# dd if=/dev/zero of=/home/bigfile bs=1M count=10000
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 189.551 seconds, 55.3 MB/s
This is writing that 10gb file with tar to tape:
]# time tar -czf /dev/Drive1 /home/bigfile
tar: Removing leading `/' from member names
real 2m53.655s
user 2m39.219s
sys 0m28.415s
]#
The 11Tb I have to backup is on a NetApp, the NetApp is mounted via NFS on the
backup host and is getting the data from there to write to disk.
ekke85
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