[linux-lvm] Raid 5 Performance

Jean Aumont jaumont at mediagrif.com
Thu Apr 10 09:10:07 UTC 2003

Hi everyone,

I have 4 identical disks that I have configured using the Linux Software
They are set-up in a raid 5 using a "chunksize" of 128 Kbytes as recommended
in the Linux Software Raid HowTo.

I could create an Ext3 file system directly over my raid 5 with the
following parameters:
chunksize=128KB, block size=4KB and stride=32.
I think those parameters are the best for performance. (Any better
suggestion would be appreciated !!!)

My question is: 

Since I want to be able to create/resize many file systems (ext3, XFS
ReiserFS) over the raid5, do I need to specified: 
"chunksize, stripe and stripesize", when performing the "lvcreate" command
(the logical volume creation) or are those
parameters used for backup and creating a raid 0 (stripe) ???

If I do need to specified those parameters, what would be the best values
regarding performance of the raid 5 ???

Thanks in advance,

Jean Aumont 

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