Thanks for your comments, Frank.
I will take a look at the inconsistencies.
Cindy
On 10/22/09 08:29, Frank Cusack wrote:
<http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#RAID-Z_Configuration_Requirements_and_Recommendations>
says that the number of disks in a RAIDZ should be (N+P) with
N = {2,4,8} and P = {1,2}.
But if you go down the page just a little further to the thumper
configuration examples, none of the 3 examples follow this recommendation!
I will have 10 disks to put into a RAIDZ. I would like as little "waste"
as possible, so that means just 1 hot spare, and a 3,3,3 config for the
remaining 9 is not appealing. Should I do a single 9 disk RAIDZ, per
the guideline, or should I do 4,5.
This is for engineering data. My workload isn't established yet but from
talking to the guys the "working set" would fit in a TB and just be local
to engineer workstations, while the file server will just store
infrequently used data. As such, I'm inclined to do a single 9 disk
RAIDZ and maximize the available disk space, which at the same time
follows the configuration guideline.
I'm pretty sure I already know the correct answer as I remember when
this guideline was created and why.
Besides just thinking out loud, I do want to emphasize the inconsistency
on the wiki and suggest that it be updated or a comment added.
-frank
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