[mythtv-users] Software RAID and ionice
Richard Freeman
r-mythtv at thefreemanclan.net
Thu May 24 17:45:35 UTC 2007
Richard Freeman wrote:
>
> In any case, I'll post some results with bonnie++. I started to run
> tests and got IOBOUND on mythtv - despite running bonnie++ in the idle
> ionice class. I'll run tests later today and post them...
>
Ok, here is the output of bonnie++. This was run as a normal user at
without any (io)nicing of any kind:
Here are the stats for a regular ext3 partition directly on a 7200RPM
ATA100 drive (no lvm2/raid/etc):
Version 1.93c ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -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
rich64 4G 312 94 11250 6 8301 3 1188 95 28460 4
84.4 3
Latency 88477us 66596ms 64744ms 33653us 304ms
1111ms
Version 1.93c ------Sequential Create------ --------Random
Create--------
rich64 -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 976 2 +++++ +++ 21010 45 23846 57 +++++ +++
27417 59
Latency 140ms 45423us 61051us 10185us 138us
20773us
1.93c,1.93c,rich64,1,1180012054,4G,,312,94,11250,6,8301,3,1188,95,28460,4,84.4,3,16,,,,,976,2,+++++,+++,21010,45,23846,57,+++++,+++,27417,59,88477us,66596ms,64744ms,33653us,304ms,1111ms,140ms,45423us,61051us,10185us,138us,20773us
And here is the data for the video partition running on top of lvm2
running on top of raid5 on 3x 150MB/s SATA 7200RPM drives:
Version 1.93c ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -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
rich64 4G 254 87 12802 7 9057 6 992 89 45866 20
180.5 7
Latency 379ms 38797ms 600ms 41686us 228ms
415ms
Version 1.93c ------Sequential Create------ --------Random
Create--------
rich64 -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 7809 20 +++++ +++ 16587 39 1408 3 +++++ +++
21378 49
Latency 77382us 3398us 6765us 13823us 8819us
6155us
1.93c,1.93c,rich64,1,1180009338,4G,,254,87,12802,7,9057,6,992,89,45866,20,180.5,7,16,,,,,7809,20,+++++,+++,16587,39,1408,3,+++++,+++,21378,49,379ms,38797ms,600ms,41686us,228ms,415ms,77382us,3398us,6765us,13823us,8819us,6155us
The stats are fairly comparable - block writes are a hair slower, block
reads are a lot faster - about what you'd expect. In any case, the
speed should be WAY more than needed to stream video at 1-2Mbps.
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