William Hooper wrote:
Of course if both disks of a mirror set die you lose everything, too.
Yes.
The guy was recommending RAID10 ( a bunch of RAID1 pairs then add them all together as RAID0 ).
After reading it I worked out a number comparing a RAID5 with 5 disks against RAID10 with 4 stripped sets of 3 disks (12 in total ). If you lose 2/5 RAID5 disks you are all lost. If you lose 5/12 RAID10s you still have over a 95% chance of no data lost. I believe recovery time on RAID10 puts RAID5 to shame too. His entire rant can be found at http://groups.google.com.au/groups?q=quarterly+raid+5+rant+group:comp.databases.informix&hl=en&lr=&ie=UTF-8&group=comp.databases.informix&selm=pan.2003.07.31.16.49.22.318281.15473%40bloomberg.net&rnum=5
( search comp.databases.informix for quarterly raid 5 rant)
I've only experimented with RAID myself so most of my curiosity is about what people who have suffered a catastrophic data loss chose, and if they intend to do anything different in future...
-- Scott Burns Mirrabooka Systems
Tel +61 7 3857 7899
Fax +61 7 3857 1368
