Hi all, I'm having issues with write speeds to our LTO drive. Copy jobs
aren't going over 100 MB/sec, and on average it's around 80 MB/sec.
Using btape speed I was benchmarking the performance on different tapes
(HW compression on/off, HW encryption on/off), and it reached 180-220
MB/sec, depending on the test. Still, it's nowhere near the theoretical
maximum of the LTO 8 specification. But even reaching the benchmark
speeds would mean that our job copy time would be halved.
Our Storage Daemon stores all full and incremental backups on a file
volume. This volume resides on a ZFS pool. I've also benchmarked the ZFS
pool, and it easily reads continuously over 300 MB/sec. Once a month, we
issue a Copy Job to the LTO 8 tape.
Bacula DIR and SD run on the same machine, with a Quantum LTO-8 HH
drive, using Quantum MR-L8MQN-01 tapes.
bacula-dir.conf
Storage {
Name = ultrium
Address = bacula
SDPort = 9103
Password = <redacted>
Device = ultrium
Media Type = LTO
AllowCompression = no # LTO drive does the compression
Maximum Concurrent Jobs = 1 # Prevent shoeshining
}
bacula-sd.conf
Device {
Name = FileStorage
Media Type = File
Archive Device = /mnt/backup/tapes # Zfs pool
Label Media = yes; # let Bacula label unlabeled media
Random Access = Yes;
AutomaticMount = yes;
RemovableMedia = no;
AlwaysOpen = no;
}
Device {
Name = ultrium
Media Type = LTO
Device Type = Tape;
Archive Device = /dev/nst0
AutomaticMount = yes;
AlwaysOpen = no;
RemovableMedia = yes;
RandomAccess = no;
Maximum File Size = 5GB
Device Type = Tape;
Volume Poll Interval = 5s;
Close on Poll = Yes;
Maximum Concurrent Jobs = 1; # Prevent shoeshining
}
tapestat
Tape: r/s w/s kB_read/s kB_wrtn/s %Rd %Wr %Oa Rs/s Ot/s
st0 0 1536 0.0k 94.5M 0% 41% 41% 0 0
Am I'm missing some important properties in the resources? Any help is
appreciated.
- Gilles
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