Hi,
15.07.2008 20:23, Shad L. Lords wrote:
> I've been playing with bacula and have noticed something that doesn't
> quite look right to me. I'm spooling backups to disk before writing
> them to tape. I've set it up to accept up to 8 jobs at the same time.
> When it first starts out it will spool all 8 at the same time. However
> as it progresses and gets near the end of the list of jobs it seems that
> something is blocking some of the spools.
Which version of Bacula do you run?
It seems possible that this is related to an issue where the SD
locking volumes, jobs, and whatever is not working correctly. SOme of
this should be fixed in the current released version 2.4.1.
Arno
> Here is the output of "status
> storage" near the end of the run. I can see one despooling and only one
> spooling. There are three that are just sitting there doing nothing.
> The clients are idle and the backup server has plenty of cpu/memory/disk
> throuput available to it.
>
>
> Running Jobs:
> Writing: Full Backup job bugs.contribs.local JobId=12 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=0 despooling=1 despool_wait=0
> Files=39,911 Bytes=745,268,014 Bytes/sec=1,184,845
> FDReadSeqNo=308,406 in_msg=208109 out_msg=9 fd=14
> Writing: Full Backup job mythtv64.lordsfam.net JobId=13 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=1,222 Bytes=105,669,873 Bytes/sec=8,805,822
> FDReadSeqNo=9,756 in_msg=6993 out_msg=5 fd=27
> Writing: Full Backup job xen32-4.contribs.local JobId=14 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=0 despooling=0 despool_wait=0
> Files=0 Bytes=0 Bytes/sec=0
> FDReadSeqNo=6 in_msg=6 out_msg=4 fd=20
> Writing: Full Backup job xen32-3.contribs.local JobId=15 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=0 despooling=0 despool_wait=0
> Files=0 Bytes=0 Bytes/sec=0
> FDReadSeqNo=6 in_msg=6 out_msg=4 fd=24
> Writing: Full Backup job xen32-2.contribs.local JobId=16 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=6,662 Bytes=91,902,974 Bytes/sec=7,658,581
> FDReadSeqNo=56,971 in_msg=38232 out_msg=5 fd=13
>
>
> As soon as the despooling job finishes then the other three start spooling:
>
> Running Jobs:
> Writing: Full Backup job mythtv64.lordsfam.net JobId=13 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=5,398 Bytes=365,347,751 Bytes/sec=7,306,955
> FDReadSeqNo=45,911 in_msg=32059 out_msg=5 fd=27
> Writing: Full Backup job xen32-4.contribs.local JobId=14 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=2,137 Bytes=79,500,544 Bytes/sec=8,833,393
> FDReadSeqNo=18,061 in_msg=12302 out_msg=5 fd=20
> Writing: Full Backup job xen32-3.contribs.local JobId=15 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=4,293 Bytes=127,422,442 Bytes/sec=14,158,049
> FDReadSeqNo=32,905 in_msg=22365 out_msg=5 fd=24
> Writing: Full Backup job xen32-2.contribs.local JobId=16 Volume="MA3001"
> pool="Monthly" device="SSL2020-AIT3-Drive1" (/dev/nst0)
> spooling=1 despooling=0 despool_wait=0
> Files=31,778 Bytes=370,412,411 Bytes/sec=7,408,248
> FDReadSeqNo=259,814 in_msg=174299 out_msg=5 fd=13
>
>
> The effect of this is that I'm not able to keep the tape running at full
> speed. What ends up happening is that it will spool the first set of
> jobs and then start writing them to tape. After it has finished writing
> a job to tape it will sometimes start spooling a waiting job. Most of
> the times it won't until all the spooled jobs are despooled. I've set
> aside plenty of spool space and it doesn't even come close to filling it up.
>
> I'd appreciate it if anyone could point me in a direction that might
> indicate what I've missed or done wrong. I'd really like to be able to
> stream to the tape drive as fast as I possibly can.
>
> Thanks,
>
> -Shad
>
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--
Arno Lehmann
IT-Service Lehmann
www.its-lehmann.de
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