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From Igor Galić <i.ga...@brainsware.org>
Subject Re: Question about disk optimization in ATS.
Date Wed, 14 Dec 2011 21:14:10 GMT


----- Original Message -----
> 
> 
> 
> Thanks for the insight John.
> 
> 
> 
> When you say no RAID of any kind – I was going to format 2 large
> hardware raid 5 sets for redundancy. The raid 5 sets would be
> comprised of 3 * 146GB SCSI drives (as there are two raid 5 sets
> there are 6 disks in total). Are you saying that it would be best if
> I just presented 6 (un-raided) disks to be formatted as raw disks?

Yes.

> Kind Regards
> 
> 
> 
> Chris
> 
> 
> 
> 
> From: John Plevyak [mailto:jplevyak@gmail.com]
> Sent: Wednesday, December 14, 2011 4:04 PM
> To: users@trafficserver.apache.org
> Subject: Re: Question about disk optimization in ATS.
> 
> 
> 
> 
> 
> 
> 
> Under heavy forward proxy load, ATS tends to be seek limited which
> favors lots of disks. As ATS has its own recovery mechanisms it is
> best *not* to use raid5 or any raid, but just a bunch of raw disks
> listed in the storage.config.
> 
> 
> 
> 
> 
> ATS needs to have small block sizes, so don't use raid or stripe with
> a volume manager as this will degrade performance.
> 
> 
> 
> 
> 
> If you use a disk which has large blocks (3GB disk) then you may need
> to set the flag to force ATS to use a larger internal blocks size
> which results in some waste of disk space.
> 
> 
> 
> 
> 
> If you are reverse proxy and have a small working set and a good size
> RAM cache you may not be disk limited, in which case you have more
> flexibility. Even in this case I would
> 
> 
> still suggest not using raid or striping.
> 
> 
> 
> 
> 
> john
> 
> 
> 
> 
> On Wed, Dec 14, 2011 at 12:09 PM, James Chris Beaver <
> beaverj@algonquincollege.com > wrote:
> 
> 
> 
> 
> 
> Hello Folks,
> 
> 
> 
> I am looking for information in regards to the best way to optimize
> disk in ATS. I understand that the application uses raw disks
> however what is the best way to lay out those disks? Is it best to
> have more than one cache disk? I am inclined to put up more than one
> hardware raid5 volume and then format them as raw disks for ATS to
> make use of. Is there a “rule of thumb” when it comes to disk
> sizing? What block size is best (large of small)? For example if you
> have to large of a disk(s) will that slow down ATS as it must spend
> time keeping track of very large caches?
> 
> 
> 
> Any guidance is greatly appreciated.
> 
> 
> 
> Regards
> 
> 
> 
> --
> 
> Chris Beaver
> 
> UNIX Systems Administrator, ITS - Algonquin College
> 
> 1385 Woodroffe Ave
> 
> Ottawa, ON K2G 1V8
> 
> email: beaverj@algonquincollege.com
> 
> phone: (613) 727-4723 x 5385
> 
> fax: (613) 727-7719
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

-- 
Igor Galić

Tel: +43 (0) 664 886 22 883
Mail: i.galic@brainsware.org
URL: http://brainsware.org/
GPG: 6880 4155 74BD FD7C B515  2EA5 4B1D 9E08 A097 C9AE


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