Re: Benchmark: Dell/Perc 6, 8 disk RAID 10

On 16-Mar-08, at 3:04 PM, Craig James wrote:

> Dave Cramer wrote:
>> On 16-Mar-08, at 2:19 AM, Justin wrote:
>>>
>>> I decided to reformat the raid 10 into ext2 to see if there was
>>> any real big difference in performance as some people have noted
>>> here is the test results
>>>
>>> please note the WAL files are still on the raid 0 set which is
>>> still in ext3 file system format.  these test where run with the
>>> fsync as before.   I made sure every thing was the same as with
>>> the first test.
>>>
>> This is opposite to the way I run things. I use ext2 on the WAL and
>> ext3 on the data. I'd also suggest RAID 10 on the WAL it is mostly
>> write.
>
> Just out of curiosity: Last time I did research, the word seemed to
> be that xfs was better than ext2 or ext3.  Is that not true?  Why
> use ext2/3 at all if xfs is faster for Postgres?
>
I would like to see the evidence of this. I doubt that it would be
faster than ext2. There is no journaling on ext2.

Dave