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List:       info-cyrus
Subject:    Re: rooling replication and many pop3d
From:       Oberdan Albertoni <obe () digicolor ! net>
Date:       2011-11-25 15:25:46
Message-ID: 4ECFB37A.2070107 () digicolor ! net
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Thank you all,
I wiil do analysis to verify the problem about storage.
By Obe.


On 24/11/2011 14:17, Andy Bennett wrote:
> Hi,
> 
> > > What IO subsystem do you have on this machine? What filesystem are you
> > > using?
> > I have  4 HDD 500GB S SATA II
> > with LSI 8704 ELP SAS
> > RAID 6
> > filesystem ext3 mounted with noatime, nodiratime
> 
> > this my vmstat after I run the command   find -type f | xargs cat>
> > /dev/null  :
> > 
> > http://www.digicolor.net/cyrus/img7.jpg
> This is a very sad set of numbers. :-( It's still really, really choppy
> and the dead spots don't seem to correlate particularly well with bo
> activity.
> 
> Have you got someone who can help you debug your storage array and
> ensure that it's not degraded in some way? Is the battery empty? Are
> there any disks which are failing? Do all the disks have their write
> caches and retry handling set up correctly?
> 
> How old is your file system? Have you been running it near capacity
> (>70% full) for long periods of time?
> 
> You might be able to tell whether you have a file system problem or an
> array problem by comparing your previous vmstat with the results
> obtained from 'sudo /sbin/haparm -tT /dev/<spool dev>'. For reference,
> on my disk I get:
> 
> -----
> $ sudo /sbin/hdparm -tT /dev/sda
> 
> /dev/sda:
> Timing cached reads:   3272 MB in  2.00 seconds = 1637.05 MB/sec
> Timing buffered disk reads:  194 MB in  3.02 seconds =  64.18 MB/sec
> -----
> 
> I'd certainly not expect anything less from your array. I'd hope for at
> least 100MB/sec if not a lot more.
> 
> 
> 
> 
> 
> 
> Regards,
> @ndy
> 


-- 
Oberdan Albertoni

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