On Apr 12, 2011, at 8:53 AM, Rudi Ahlers Rudi@SoftDux.com wrote:
On Tue, Apr 12, 2011 at 2:47 PM, Marian Marinov mm@yuhu.biz wrote:
Steve, I'm managing machines with 30TB of storage for more then two years. And with good reporting and reaction we have never had to run fsck.
However I'm sure that if you have to run fsck on so big file systems, it will be fater to rebuild the array from other storage then waiting for a few weeks to finish.
On machines like that I use CentOS but I'm pratitioning them before the install with a rescue live cd that I have created for me.
Marian
As matter of interest, what hardware do you use? i.e. what CPU's, size of RAM and RAID cards do you use on this size system?
Everyone always recommends to use smaller RAID arrays than one big fat one. So, I'm interested to know what you use, and how effective it works. i.e. if that 30TB was actively used by many hosts how does it cope? Or is it just archival storage?
I would never create a RAID5/6 greater then 8 disks. Usually I create a 6 or 7 disk RAID5 which means I can fit 2 in a 15 disk enclosure and have a hot spare and stripe them.
The more RAID5 sets you have the greater the write IOPS you can achieve.
Though for max IOPS nothing beats RAID10.
-Ross