Matt Gulick wrote:

On Mon, 2004-04-05 at 10:51, Jason C. Leach wrote:
 

quoted

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.