El 09/02/12 13:46, Cristóbal Sabroe Yde escribió:
Hi, I've just installed a new backup system consisting of An IBM
TS3100 (
LTO5) with bacula 5.2.5 running on an openSUSE 12.1 x86_64 server.
I'm having VERY low backup speed with 99.99% io usage from jbd2
and don't know what could be causing it. I see this behaviour only
when running a job in bacula (a local backup or network with spool
and without spool). I've tried intensive disk usage, intensive
mysql usage and tape testing (tar and btape) and the problem
doesn't occur.
The root fs is ext4 w/journal.
bacula is from this repository: http://download.opensuse.org/repositories/Archiving:/Backup:/Factory/openSUSE_12.1
This is what I see in iotop when backing up:
Total DISK READ: 0.00 B/s | Total DISK WRITE: 433.97 K/s
PID PRIO USER DISK READ DISK WRITE SWAPIN IO>
COMMAND
350 be/3 root 0.00 B/s 3.91 K/s 0.00 % 99.99 %
[jbd2/sda2-8]
2367 be/4 mysql 0.00 B/s 74.28 K/s 0.00 % 0.02 % mysqld
--basedir=/usr --datadir=/var/lib/mysql
--plugin-dir=/usr/lib64/~/var/run/mysql/mysqld.pid
--socket=/var/run/mysql/mysql.sock --port=3306
[...]
Client status when running a backup:
listas Version: 5.0.2 (28 April 2010) x86_64-unknown-linux-gnu
suse 5.x
Daemon started 08-Feb-12 15:16, 3 Jobs run since started.
Heap: heap=1,794,048 smbytes=903,251 max_bytes=920,534 bufs=1,320
max_bufs=1,944
Sizeof: boffset_t=8 size_t=8 debug=0 trace=0
Running Jobs:
JobId 13 Job listas.2012-02-09_12.23.40_04 is running.
Full Backup Job started: 09-Feb-12 11:01
* Files=65,405 Bytes=2,513,983,277 Bytes/sec=689,896 Errors=0*
Files Examined=65,439
Processing file: /usr/share/fonts/misc/gb24st.pcf.gz
SDReadSeqNo=5 fd=5
Director connected at: 09-Feb-12 12:01
====
These are my Device and Autochanger definition:
Device {
Name = lto5
Device Type = Tape
Media Type = lto5
Archive Device = /dev/nst0
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
Maximum File Size = 5GB
AutoChanger = yes
Alert Command = "sh -c 'smartctl -H -l error %c'"
Spool Directory = /spool # fs (ext3) mounted
from a dedicated hdd
Maximum Spool Size = 268435456000 # 250 GB (
60*1073741824)
}
Autochanger {
Name = Autochanger
Device = lto5
Changer Command = "/usr/lib64/bacula/mtx-changer %c %o %S
%a %d"
Changer Device = /dev/sg3
}
Does anybody had this issue?
--
 .Cris.
This is killing my brain.
I've manage to improve backup the speed of network backups (although
not as much as our production backup system (SCSI LTO4 + openSUSE
11.2 + bacula 5.0.3)
Network backup on new server:
Elapsed time: 8 mins 32 secs
Priority: 90
FD Files Written: 85,786
SD Files Written: 85,786
FD Bytes Written: 4,242,555,207 (4.242 GB)
SD Bytes Written: 4,253,503,233 (4.253 GB)
Rate: 8286.2 KB/s
Software Compression: None
VSS: no
Encryption: no
Accurate: no
Network backup on production:
Elapsed time: 9 mins 1 sec
Priority: 90
FD Files Written: 95,052
SD Files Written: 95,052
FD Bytes Written: 5,506,906,966 (5.506 GB)
SD Bytes Written: 5,519,304,638 (5.519 GB)
Rate: 10179.1 KB/s
Software Compression: None
VSS: no
Encryption: no
Accurate: no
I believe the problem is in the jounaling of the ext4 filesystem.
I've set 'nobarrier' as a mounting option of my spooling device and
got a big improvement.
Still have problems backing up the local server.
Setting the same option on the root fs didn't solve the complete
issue.
Has anyone experienced problems like this on openSUSE 12.1?
Which filesystem type do you recommend for the bacula server?
Thanks
--
.Cris.
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