I've been wrestling with some fairly slow backups for a while now. I
have amanda 2.4.2 server, running a dual 733 dell rack server, (256mb
ram, UW scsi disk) with a 3com 100mb switch stack. the network is far
from saturated.
the only thing that gets me are the clients.. I have 3 SGI's, a
challange-S, an O-200, and an O2. I also have a PII-450 netBSD
machine. all run extremely slow.
as far as I can tell from my MRTG graphs.. no single backup process will
exceed 100KB/sec, most run around 50KB/sec
here are some of my config lines...
---- amanda.conf ----
inparallel 12
maxdumps 5
netusage 100 Mbps
define dumptype ima-ss-comp-high-tar {
high-tar
compress server fast
exclude list "/usr/local/amanda/etc/amanda/Test/excludes"
}
define interface eth0 {
comment "100 Mbps ethernet"
use 100 Mbps
}
define interface local {
comment "a local disk"
use 50 mbps
}
------ disklist -----------
fs0 /home ima-ss-comp-user-tar 1
eth0
fs0 /varsity ima-ss-comp-user-tar 2
eth0
fs0 /share ima-ss-comp-user-tar 3
eth0
fs0 /sgiexport ima-ss-comp-user-tar 4
eth0
fs0 /user01 ima-ss-comp-high-tar 7
eth0
fs0 /user06 ima-ss-comp-high-tar 7
eth0
fs0 /user03 ima-ss-comp-high-tar 7
eth0
fs0 /user02 ima-ss-comp-high-tar 8
eth0
there are aprox 30 filesystems in the list. and the only thing I can
think of that is slowing the backup down is GNUtar on the SGI's but it
affects the netBSD system as well.
I also noticed a bug in the SGI sendsize, it's counting the number of
blocks, which are 512 bytes, not 1024, but reporting them as Kbytes.
here's an amstatus durring one of the slow backups
Using /var/log/amanda/Test/amdump from Tue Feb 20 01:35:01 CST 2001
fs0:/home 1 32k finished (2:27:04)
fs0:/linuxexport 2 224k finished (2:28:52)
fs0:/math1 0 1581856k finished (9:04:42)
fs0:/math2 1 32k finished (2:27:17)
fs0:/sgiexport 0 886048k finished (6:53:37)
fs0:/share 1 320k finished (2:32:22)
fs0:/software 1 1088k finished (2:42:03)
fs0:/user01 0 913064k dumping 332096k (
36.37%) (8:32:10)
fs0:/user02 1 12096k finished (9:10:24)
fs0:/user03 2 3904k finished (8:35:41)
fs0:/user06 0 1631872k finished (8:35:36)
fs0:/user07 0 1451136k finished (9:10:17)
fs0:/user08 1 5248k finished (9:17:34)
fs0:/user10 1 1216k finished (2:46:54)
fs0:/varsity 2 64k finished (2:27:39)
gold:/user20 1 [/usr/local/bin/gtar returned
2] (2:37:31)
gold:/user35 0 [/usr/local/bin/gtar got
signal 13] (2:33:53)
i5:/TeX 1 224k finished (2:28:04)
i5:/syscom 1 224k finished (2:29:27)
mail:/export 0 no estimate
www:/dev/wd0e 1 84768k finished (5:32:29)
www:/usr 1 10560k finished (5:41:42)
www:/web 0 4086656k finished (5:23:39)
SUMMARY part real estimated
size size
partition : 23
estimated : 22 14888599k
failed : 3 4262655k ( 28.63%)
wait for dumping: 0 0k ( 0.00%)
dumping to tape : 0 0k ( 0.00%)
dumping : 1 332096k 913064k ( 36.37%) ( 2.23%)
dumped : 19 9757568k 9712880k (100.46%) ( 65.54%)
wait for writing: 0 0k 0k ( 0.00%) ( 0.00%)
writing to tape : 0 0k 0k ( 0.00%) ( 0.00%)
failed to tape : 0 0k 0k ( 0.00%) ( 0.00%)
taped : 19 9757568k 9712880k (100.46%) ( 65.54%)
11 dumpers idle : not-idle
taper idle
network free kps: 255922
holding space : 29273332k ( 96.97%)
dumper0 busy : 5:10:54 ( 75.72%)
dumper1 busy : 0:50:01 ( 12.18%)
dumper2 busy : 0:10:33 ( 2.57%)
dumper3 busy : 2:41:15 ( 39.27%)
dumper4 busy : 0:06:41 ( 1.63%)
dumper5 busy : 6:01:59 ( 88.16%)
dumper6 busy : 6:35:23 ( 96.29%)
dumper7 busy : 6:30:20 ( 95.07%)
dumper8 busy : 0:18:09 ( 4.42%)
taper busy : 0:37:35 ( 9.16%)
0 dumpers busy : 0:00:00 ( 0.00%)
1 dumper busy : 0:00:03 ( 0.01%) not-idle: 0:00:03
(100.00%)
2 dumpers busy : 0:18:42 ( 4.56%) not-idle: 0:12:07 (
64.81%)
client-constrained: 0:06:20 (
33.86%)
start-wait: 0:00:14 (
1.34%)
3 dumpers busy : 2:08:42 ( 31.34%) client-constrained: 2:08:01 (
99.48%)
start-wait: 0:00:40 (
0.52%)
4 dumpers busy : 1:08:42 ( 16.73%) client-constrained: 1:08:38 (
99.91%)
start-wait: 0:00:03 (
0.09%)
5 dumpers busy : 2:55:04 ( 42.64%) client-constrained: 2:55:04
(100.00%)
6 dumpers busy : 0:09:43 ( 2.37%) client-constrained: 0:09:43
(100.00%)
7 dumpers busy : 0:03:56 ( 0.96%) client-constrained: 0:03:56
(100.00%)
8 dumpers busy : 0:05:04 ( 1.24%) client-constrained: 0:05:04
(100.00%)
9 dumpers busy : 0:00:36 ( 0.15%) client-constrained: 0:00:36
(100.00%)
--
Ben Kochie | [EMAIL PROTECTED]
IMA Systems Office | 400 Lind Hall, 207 Church St. SE
http://www.ima.umn.edu | Minneapolis, MN 55455-0463
