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Re: XFS Test Results Interpretation

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: Re: XFS Test Results Interpretation
From: Andrew Debenham <adebenham@xxxxxxxxxxx>
Date: Mon, 25 Oct 2010 07:17:24 -0400
Accept-language: en-US
Acceptlanguage: en-US
Thread-index: Act0Lzgi2xnZiG0DTLyIU1xaIvo0tg==
Thread-topic: XFS Test Results Interpretation
Stan -

Thank you for your response and I apologize if my initial explanation wasn't 
clear.  The applications will be running on identical hardware (see specs. 
below) but each application will be running on a dedicated system.  My original 
spreadsheet had this information but it obviously didn't come through 
correctly.  I would like to tune the XFS file systems to accommodate the two 
different applications.  As I mentioned before, I experimented with various 
parameters (e.g. sunit, swidth, log size, etc.) and different mounting options 
(e.g. logbufs, logbsize, etc.), but it sounds like I may have been wasting my 
time attempting to benchmark the file systems.  Any information or 
recommendations you can provide would be greatly appreciated.  Also, can you 
recommend a tool that would be good for benchmarking an XFS file system (if one 
exists)?  Thanks again!

- Andy

System Specs
Motherboard:  Supermicro X8DTU
Chipset:  Intel 5520 (Tylersburg)
Processors:  Dual Intel Xeon E5540 @2.53GHz
RAM:  32GB PC3-8500 1066MHz
OS:  CentOS 5.3
Kernel:  2.6.18-128.el5
RAID Controller:  3ware 9650SE-12M
Disk Type:  SATA
Disk Size:  1.82 TB
RAID Level:  6
# of disks:  11
Stripe Size:  256 KB
File System Size:  16.37 TB
XFS Info:  kmod-xfs-0.4-2, xfsprogs-2.9.4-1.el5.centos

> ----------------------------------------------------------------------
> Message: 1
> Date: Sat, 23 Oct 2010 22:38:25 -0500
> From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
> Subject: Re: XFS Test Results Interpretation
> To: xfs@xxxxxxxxxxx
> Message-ID: <4CC3AA31.2000101@xxxxxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1

> Andrew Debenham put forth on 10/23/2010 9:59 PM:
> > I am in the process of trying to determine the best parameters to use when 
> > creating and mounting an XFS file system on some new hardware we are going 
> > to be using.  My company has two separate applications that will
> > be running on the same hardware (but on separate systems).  One application 
> > is the PostgreSQL database and the other is a custom application that does 
> > writes to many (~1,000) relatively small (~672MB) files
>> concurrently.

> Post the detailed hardware specs (server, local RAID or SAN, number of disks 
> in stripe set, RAID level, etc), and if both applications are running on the 
> same physical machine or different machines.  Are both apps writing to > the 
> same XFS filesystem or two different filesystems?
> Your description of "what is where" was very confusing.

> Oh, and Bonnie++ test results are usually useless, as well as IOZone, etc.  
> Next time ask before taking the time to run benchmarks and jump through hoops 
> to get the data onto the list. :)

> -- Stan

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