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Re: Amflush Slow in 2.5.2
2007-05-23 13:56:59
The tape usage is normal, amanda always put the dump in datestamp order
to the tape, it tried a big DLE on tape genepi042, it didn't fit and
retried it on next tape. It's the normal behavior.
For the performance issue, amanda is waiting in write system call to the
tape drive (wrwait is large).
Maybe the system is overloaded, scsi problem, ....
Jean-Louis
Steven Backus wrote:
Friday night I was somewhat more successful with autoflush in that
my disks were emptied correctly, albeit very slowly. The new
amflush took ~24 hours to complete, a factor of 3 times more slowly
than 2.5.1p3. Further, my tape usage was very poor, in 2.5.2 I
see:
USAGE BY TAPE:
Label Time Size % Nb Nc
genepi042 5:03 37759264k 57.8 19 0
genepi043 9:35 71714592k 109.7 23 0
genepi044 8:13 61836128k 94.7 47 0
genepi045 3:17 24587904k 37.6 1 0
Note the first tape was only half used. As far as I can tell,
autoflush in 2.5.2 uses a new tape for the old dumps, not filling
up the first. I never had this problem with previous versions:
USAGE BY TAPE:
Label Time Size % Nb Nc
genepi035 2:33 54701152k 83.8 40 0
genepi036 3:29 74139808k 113.4 28 0
genepi051 2:36 55659520k 85.1 22 0
In short, amflush, although working now, seems to have performance
problems.
Steve
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