lkml.org 
[lkml]   [2006]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ANNOUNCE] RAIF: Redundant Array of Independent Filesystems
Nikolai Joukov wrote:
> replication. In case of RAID4 and RAID5-like configurations, RAIF performed
> about two times *better* than software RAID and even better than an Adaptec
> 2120S RAID5 controller. This is because RAIF is located above file system
> caches and can cache parity as normal data when needed. We have more
> performance details in a technical report, if anyone is interested.

This doesn't make sense to me. You do not want to cache the parity
data. It only needs to be used to validate the data blocks when the
stripe is read, and after that, you only want to cache the data, and
throw out the parity. Caching the parity as well will pollute the cache
and thus, should lower performance due to more important data being
thrown out.




-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-12-13 20:19    [W:0.173 / U:0.564 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site