TDPO and restore speed problem
- From: "tefetufe ." <coskan@xxxxxxxxx>
- To: Oracle Discussion List <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 19 Oct 2013 15:29:36 +0100
Hi,
We are doing some backup restore tests on our brand new environment using
tivoli tdpo.
Using rman We are backing up 8TB uncompressed backup in the same campus
with 6 channels in 3 hours using 10Gb network and writing into VTL
When we try to restore same backup from another location using 1Gb card
with 6 channels and same rman settings we are somehow limited with *16MB
/sec *per channel (our previous restores never hit this issue when DB was
runnin on solaris and 10G)
No matter how many channels we run total throughput is increasing in linear
but per channel limit is still 16MB/sec
I'm kind suspicious about this *16MB/sec *wall we are hitting. As we are
not even using whole network bandwidht. I expect we can go higher with less
channles but it is not the case. no matter what the number of channels are
it is always 16MB/sec
There is no hardware multiplexing
We already tried playin with tcpwindow size on tdpo settings and
BACKUP_TAPE_IO_SLAVES=TRUE
Database is 11.2.0.3 and using filesystem (veritas with cio) on Redhat 6
My real wonder is if anybody seen this limitation per channel at all
strace sample outpu
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
94.33 0.418938 38 10943 5620 semtimedop
3.16 0.014031 0 64380 times
1.44 0.006395 1 10617 semctl
0.81 0.003601 1 5442 io_submit
0.26 0.001169 1 1396 io_getevents
0.00 0.000000 0 168 getrusage
------ ----------- ----------- --------- --------- ----------------
100.00 0.444134 92946 5620 total
perf sample output is like below.
56.27% oracle oracle [.] sxorcopychk
21.92% oracle [kernel.kallsyms] [k] 0xffffffff8103ba4a
2.29% oracle oracle [.] krbddoh
1.22% oracle oracle [.] krbr1b1
0.98% oracle oracle [.] ksfvsubmit
0.97% oracle oracle [.] ksliwat
0.91% oracle oracle [.] krbr1b2
0.89% oracle oracle [.] krbrpr
0.64% oracle oracle [.] kcbhcvbo
0.53% oracle oracle [.] krbcdb
Appreciate if anybody hit the same issue before
Regards
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Coskan GUNDOGAR
Email: coskan@xxxxxxxxx
Blog: http://coskan.wordpress.com
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