[mythtv-users] Why RAID 5 stops working in 2009

Thomas Fjellstrom tfjellstrom at shaw.ca
Fri Oct 24 23:58:46 UTC 2008


On Friday 24 October 2008, Steve Heistand wrote:
> } >
> } My understanding is that raid5 and raid6 write performance is sensitive
> } to the size of writes compared to the stripe size. Assuming that is true
> } what would be the optimal stripe size for a mythtv raid5 for recording
> } HDTV? Can the size of mythtv read and write sizes be adjusted to improve
> } performance for a storage group on a raid5 array?
>
> true, but this falls under the hurry up and wait category.
> even the worst performaning raid is faster then hdtv needs.
> bad raids give 20M/sec, uber HD signal needs about 5M/s.

Wow, 20M? My laptop's single pata 5400rpm disk gives me 40 :o I get 200-300 
from my new raid5 (4x640 sataII).

-- 
Thomas Fjellstrom
tfjellstrom at shaw.ca


More information about the mythtv-users mailing list