[CentOS] 3Ware 9550SX and latency/system responsiveness

Fri Sep 14 09:34:21 UTC 2007
Feizhou <feizhou at graffiti.net>

Simon Banton wrote:
>> Hmm, how are you creating your ext3 filesystem(s) that you test on? 
>> Try creating it with a large journal (maybe 256MB) and run it in full 
>> journal mode.
> The filesystem was created during the initial CentOS installation, and 
> I've tried it with ext2 which made no difference.

The journal size was probably 32MB then. A 128MB or larger journal in 
full journal mode on a 3ware card with a BBU write cache should make a 
big difference because fsync calls will now return OK as soon as it hits 
the write cache....oh....do you have a BBU for your write cache on your 
3ware board?