[mythtv-users] TFW, Error: Write -- IOBOUND

GARETH GLACCUM gareth.glaccum at btopenworld.com
Sun Jan 7 21:22:48 UTC 2007


I was watching this as I had a similar error. I was using two SATA-II (3GB) 
250MB drives in a raid-0 stripe for sdb and sdc, sda is a SATA-I for the OS. 
(I currently have 4 transcodes and an update running in the background so my 
figures are a little lower than I would expect)
I think that for me, as this error only occurred in the first part of the 
transcode, it is due to the spin-up time for my disks (the error that is). 
Once the disk is in the sequential read/write part of the cycle, there were 
no errors.
Gareth

For comparison:

[root at localhost ~]# hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   3172 MB in  2.00 seconds = 1586.43 MB/sec
 Timing buffered disk reads:  174 MB in  3.01 seconds =  57.76 MB/sec
[root at localhost ~]# hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   2980 MB in  2.00 seconds = 1489.88 MB/sec
 Timing buffered disk reads:  116 MB in  3.01 seconds =  38.58 MB/sec
[root at localhost ~]# hdparm -Tt /dev/sdc

/dev/sdc:
 Timing cached reads:   2960 MB in  2.00 seconds = 1478.78 MB/sec
 Timing buffered disk reads:  112 MB in  3.00 seconds =  37.31 MB/sec


----- Original Message ----- 
/dev/sda:
 Timing cached reads:   2396 MB in  2.00 seconds = 1197.93 MB/sec
 Timing buffered disk reads:  218 MB in  3.01 seconds =  72.37 MB/sec

Sherm
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