RHEL to FreeBSD file server

[Bob Friesenhahn]

On Tue, 13 Nov 2012, Julian Elischer wrote:

> On 11/13/12 1:19 PM, Jason Keltz wrote:
>> On 11/13/2012 12:41 PM, Bob Friesenhahn wrote:
>>> On Mon, 12 Nov 2012, kpneal at pobox.com wrote:
>> 
>> Initially, I had one storage chassis, split between 2 LSI 9205-8e 
>> controllers with a 22 disk pool comprised of 11 mirrored vdevs.
>> I think that I'm still slightly uncomfortable with the fact that 2 disks, 
>> which were all purchased at the same time, could essentially die at the 
>> same time, killing my whole pool.   Yet, while moving to raidz2 would allow 
>> better redundancy, I'm not sure if the raidz2 rebuild time and decrease in 
>> performance would be worth it..

The concern about a bad batch of disks is a valid concern.  Of course 
a bad batch of disks could even bring down raidz2.  If this is a 
concern, then purchase the disks from two different vendors.

>> I'll buy another md1220, a few more disks, add another 9205-8e card...  and 
>> use triple mirrored vdevs instead of dual....  I only really need about 8 x

Triple mirror is considered to be exceedingly reliable.  Not very cost 
effective though.  Reads will be faster than with simple mirror since 
any one of the three disks can satisfy a read request.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/