| |||||||||||||
Enabling barriers since 2.6.9 and hdparm questionEnabling barriers since 2.6.9 and hdparm questionPosted May 22, 2008 11:33 UTC (Thu) by zmi (guest, #4829)In reply to: Enabling barriers since 2.6.9 and hdparm question by pr1268 Parent article: Barriers and journaling filesystems
> What is the effect of toggling the disk drive's write-caching feature Turning off write caches of disks and the RAID controller slows writing badly. Examples of a recent HP ML350 server with 3x 146GB 10k SAS disks: - disk cache and RAID write cache OFF: 65MB/s - disk cache and RAID write cache ON: 145MB/s and that is on _sequential_ writes. We didn't measure _random_ writes, but the system felt like an old 386 then. Really unusable.
(Log in to post comments)
Enabling barriers since 2.6.9 and hdparm question Posted May 22, 2008 13:40 UTC (Thu) by NAR (subscriber, #1313) [Link] Interestingly we've had different experience - turning off the write cache actually improved performance. I'm not sure why, but the whole system was somewhat complicated and we had data loss. Turning off the write cache solved the data loss problem and had this surprising side-effect too.
|
|||||||||||||