Michael Packer wrote:
The changes took it from 8+ hours to 4:45.... still would like to get it
down a bit more... I still have a problem with compsec (made a typo) so
I reformatted it by hand.
The backup itself is now done in 2:35. The rest of the time is done
by taping the chunks.
You are in the pathological case where:
1. dumping to tape is bad, because your system cannot keep the tape
streaming while reading the disk.
2. you have essentially one large disk, and parallelising the dumping
and the taping is only possible for different disks.
would it be beneficial to break /sda5 down into different disks
(I was looking at the sample disklist and saw you can do things like
/sda5/x /sda5/x2 /sda5/x3 ... etc). Currently it's creating 56 500mb
chunks
Yes, it make reason 2 disappear. Taper can start writing to tape
one "disk" while dumping the others.
is it better not to create these chunks?
If you mean seperate disklistentries (DLE's) instead of one
large DLE? (Chunking has a special meaning in the context of
a holdingdisk: it's is used to avoid the 2GByte filesize limit
on some OS's).
I think so, yes. You get at least some work done in
parallel in your pathological case.
STATISTICS:
Total Full Daily
-------- -------- --------
Estimate Time (hrs:min) 0:15
Run Time (hrs:min) 4:45
Dump Time (hrs:min) 2:23 2:23 0:00
Output Size (meg) 28778.4 28778.4 0.0
Original Size (meg) 28778.4 28778.4 0.0
Avg Compressed Size (%) -- -- --
Filesystems Dumped 7 7 0
Avg Dump Rate (k/s) 3439.2 3439.2 --
Tape Time (hrs:min) 2:15 2:15 0:00
Tape Size (meg) 28778.5 28778.5 0.0
Tape Used (%) 72.1 72.1 0.0
Filesystems Taped 7 7 0
Avg Tp Write Rate (k/s) 3634.1 3634.1 --
USAGE BY TAPE:
Label Time Size % Nb
DailySet102 2:15 28778.5 72.1 7
DUMP SUMMARY:
DUMPER STATS TAPER STATS
HOSTNAME DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s MMM:SS KB/s
----------------- ------------ ------------
localhost sda2 0 878130 878144 -- 4:29 3264.2 6:17 2327.0
localhost sda3 0 3830 3840 -- 0:01 3818.4 0:04 927.2
localhost sda5 0 28012880 28012896 -- 132:42 3518.4 125:34 3718.2
As you can see here, your dumpspeed 3518 KB/s is now optimal.
And your tape speed 3718 KBs is too.
You can now only gain more speed with parallel writing and dumping.
localhost sda7 0 385760 385760 -- 2:25 2657.5 2:22 2713.1
localhost sda8 0 185380 185408 -- 0:21 8983.4 0:46 4073.1
localhost sda9 0 2010 2016 -- 0:01 2720.4 0:03 685.2
localhost sdb1 0 1140 1152 -- 2:50 6.7 0:03 395.6
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Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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