Re: File system performance, hardware performance, ext3, 3ware RAID1, etc.

[Timothy Miller <miller@techsource.com>]

Walt H wrote:
> On Thu, Feb 12, 2004 at 06:32:31PM -0500, Timothy Miller wrote:
> 
> 
>>For writes, iozone found an upper bound of about 10megs/sec, which is 
>>abysmal.  Typically, I'd expect writes to be faster (on a single drive) 
>>than reads, because once the write is sent, you can forget about it. 
>>You don't have to wait around for something to come back, and that 
>>latency for reads can hurt performance.  The OS can also buffer writes 
>>and reorder them in order to improve efficiency.
> 
> 
> I'm joining this thread rather late, so perhaps I missed something. What 
> hardware is the test being ran on? I have an AMD MPX based setup which 
> suffers from a chipset bug which effectively limits writes to ~25MB/sec to 
> devices connected via the 768 southbridge. Maybe something similar with your 
> hardware?

Athlon 2800+
Via KT400 chipset (ABIT KD7, I believe)
WD1200JB (Western Digital 120gb)
3ware 7000-2 as RAID1
Latest Red Hat 2.4.20-?? kernel


My wife's computer has the ABIT board with the KT333 and the same drive, 
but not RAID.  SiSoft SANDRA reports 39 megs/sec for writes to an NTFS 
volume.


Right now, I'm thinking the bottleneck may be the 3ware.