[mythtv-users] OT Hardware RAID 5 Recommendations
Paul Hamm
paulhamm at verizon.net
Tue Dec 12 22:31:41 UTC 2006
> Here's the very best part... I could have left those benchmarks
> running for 60 minutes straight (done it as a test) and I would not
> have dropped a video frame, chugged out a recording, or caused any
> instability in the box. The HW Raid card (true HW Raid, not psuedo
> rocket cards) was worth every penny.
Totally agree with you on the HW raid vs software raid. Much more
consistent, much more reliable.
Tried bonnie++
[root at bigboy temp]# bonnie++ -d /vault/01/home/temp -u0 -g0 -n0 -s 8192
Using uid:0, gid:0.
Writing with putc()...done
Writing intelligently...done
Rewriting...done
Reading with getc()...done
Reading intelligently...done
start 'em...done...done...done...
Version 1.03 ------Sequential Output------ --Sequential Input-
--Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %
CP /sec %CP
blah.blah 8G 35780 65 58065 22 41983 11 59912 91 209615 21 243 0 1
After the first tests I realized that the system ram was likely causing
the suspect variation on performance. Ran with a bigger file. dd seems
to use 20-30% of one CPU core while running.
[root at blah temp]# time dd if=/dev/zero of=test bs=1M count=8192
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 150.142 seconds, 57.2 MB/s
real 2m30.173s
user 0m0.033s
sys 0m34.435s
[root at blah temp]# time rm -f test
[root at blah temp]# time dd if=/dev/zero of=test bs=1M count=8192
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 154.153 seconds, 55.7 MB/s
real 2m34.187s
user 0m0.020s
sys 0m35.221s
[root at blah temp]# time rm -f test
real 0m10.577s
user 0m0.000s
sys 0m0.951s
[root at blah temp]# time dd if=/dev/zero of=test bs=1M count=40960
40960+0 records in
40960+0 records out
42949672960 bytes (43 GB) copied, 758.55 seconds, 56.6 MB/s
real 12m38.614s
user 0m0.120s
sys 2m47.640s
[root at blah temp]# time rm -f test
real 1m5.376s
user 0m0.001s
sys 0m3.809s
[root at blah temp]# time dd if=/dev/zero of=test bs=1M count=40960
40960+0 records in
40960+0 records out
42949672960 bytes (43 GB) copied, 786.659 seconds, 54.6 MB/s
real 13m6.697s
user 0m0.124s
sys 3m3.311s
[root at blah temp]# time rm -f test
real 1m6.168s
user 0m0.000s
sys 0m3.609s
--
Paul Hamm
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