From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jason C. Leach" Subject: Re: Stripe Block Size. Date: Mon, 05 Apr 2004 09:58:48 -0700 Sender: linux-raid-owner@vger.kernel.org Message-ID: <40719048.70705@ocis.net> References: <40718078.7010303@ocis.net> <1081180986.4745.4.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1081180986.4745.4.camel@localhost.localdomain> To: gulickconsulting@direcway.com, RAID Linux List-Id: linux-raid.ids Matt Gulick wrote: >On Mon, 2004-04-05 at 10:51, Jason C. Leach wrote: > > >>hi, >> >>I have a Promise SX6000 in a RAID5 using Linux Debian on an AMD >>AthelonXP 2500+. This array will store mostly GIS data. So about 30% >>large files (a few hundred megs) and 70% small files (several megs). I >>am curious what stripe block size to use 4-64k (the fs is reiserfs). I >>was thinking 32k for the stripe block size. >> >>Thanks, >>J. >> >> > >J, > >If the large files are Audio/Video for streaming, then you will want a >larger stripe size. If not, go with the smallest that you can (a small >~.h or text file will take the same amount of space as your stripe >size). > >The best way to set this is to consider the total volume size. What >will be the allocation block size be for that size of volume if it were >on a single disk for that OS?. Set you allocation size to be the same >or some multiple of that value. > > > Thanks for the reply. The total volume size will be 800G. I'm not sure what reiserfs/Linux would use for the block size if that were on one disk. Can you give me some tips? A significant portion of the files will be a few megs and above, not really any .h or other small text files (say 1%). No streaming audio/vid. The GIS data will be csv files, shape files, large TIF files. Is it better to go smaller then larger with the stripe block size? Thanks, J.