Summary: Raid5 question

From: Ying He (yhe@sph.jhmi.edu)
Date: Fri Apr 30 1999 - 07:34:06 CDT


Dear Sun managers;

I have received a lot of responses and they are really helpful. Thanks for all
people who responsed as follow and some one I may missed:

Alex.De-La-Salle@nmp.nokia.com
Brooke King jbking@sandia.gov
Rajeev Kumar <rxk@fluent.com>
David Evans <DJEVANS@au.oracle.com>
"Hsu, Dale" <Dale.Hsu@impacgroup.com>
Jon E. Kump <xavier@postnet.com>
Michael Wang <mwang@tech.cicg.ml.com>
Matthew Atkinson <m.atkinson@csl.gov.uk>
"Evans, Dennis L" <dennis.evans@amp.com>

Here is what I had before, the problem( actually it is not problem, it is
way raid5 works in my case) is when you used GUI interface, choose 4 disks and
use entire disk striping, the disk will assinged as this:

 Disk1 Disk2 Disk3 Disk4

 R5 Stripe R5 Stripe R5 Stripe R5 Log

It took one disk as log and one used for parity, that is why I got around 17 GB.

Solution:

I created raid5 first without log, used 4 disks, then created subdisk with
1080kb, add it as log, now I got 3/4 of disk spaces which is what I
expected.

Thanks again for all wonderful suggestions, I really appreciate especially some
of people responses me a couple of time.

   

======================================
        Xueying He

Sr. Unix Sys Admin
Information Systems
School of Public Health
Johns Hopkins University
Phone: (410)614-1940
Fax: (410)955-1752
E-mail: yhe@jhsph.edu
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