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From: Justin <justin@emproshunts.com>
To: Dave Cramer <pg@fastcrypt.com>
Cc: Craig James <craig_james@emolecules.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
Date: Mon, 17 Mar 2008 02:36:58 -0500
Message-ID: <47DE1F9A.2040804@emproshunts.com> (raw)
In-Reply-To: <3CD2CF85-AD79-4500-95EE-57E6B2D01721@fastcrypt.com>
References: <f966c2ee0803052142l6a105678jfe2da92a0d9371@mail.gmail.com>
	<Pine.GSO.4.64.0803060813570.11897@westnet.com>
	<47D00DB2.7040007@emolecules.com>
	<18451.1204824562@sss.pgh.pa.us>
	<47D0AFC1.5070305@emolecules.com>
	<08115901408538@mail.emproshunts.com>
	<47D93A43.6020503@emolecules.com>
	<016301c8854e$851e06e0$3101a8c0@JDell>
	<dcc563d10803132312o1539215fk859bbae03f36e566@mail.gmail.com>
	<47DA1866.3050500@krogh.cc>
	<dcc563d10803132319u19480a4fn16115c415ee57844@mail.gmail.com>
	<47DA37E1.6050104@emproshunts.com>
	<Pine.GSO.4.64.0803140359220.20241@westnet.com>
	<47DA5852.30004@emproshunts.com>
	<47DCBBF9.1090401@emproshunts.com>
	<F38ADB71-8F77-41C8-9066-488FFCA7BD67@fastcrypt.com>
	<47DD6F4C.2050208@emolecules.com>
	<3CD2CF85-AD79-4500-95EE-57E6B2D01721@fastcrypt.com>

OK i'm showing my ignorance of linux.  On Ubuntu i can't seem to figure 
out if  XFS file system is installed, if not installed  getting it 
installed.

I would like to see the difference between XFS and ext2 performance 
numbers. 

any pointers would be nice.  I 'm not going to reinstall the OS.  Nor do 
i want to install some unstable library into the kernel. 

Dave Cramer wrote:
>
> 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
>



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