On 10/ 8/10 11:06 AM, Roy Sigurd Karlsbakk wrote:
----- Original Message -----
On 10/ 8/10 10:54 AM, Roy Sigurd Karlsbakk wrote:
Hi all
I'm setting up a couple of 110TB servers and I just want some
feedback in case I have forgotten something.
The servers (two of them) will, as of current plans, be using 11
VDEVs with 7 2TB WD Blacks each, with a couple of Crucial RealSSD
256GB SSDs for the L2ARC and another couple of 100GB OCZ Vertex 2
Pro for the SLOG (I know, it's way too much, but they will wear out
slowlier and there aren't fast SSDs around that are small). There
will be 48 gigs of RAM for each box on recent Xeon CPUs.
What configuration are you proposing for the vdevs? Don't forget you
will have very long resilver times with those drives.
RAIDz2 on each VDEV. I'm aware of that the resilver time will be worse than
using 10k or 15k drives, but then, those 2TB drives aren't available for
anything but 7k2 or less.
I would seriously consider raidz3, given I typically see 80-100 hour
resilver times for 500G drives in raidz2 vdevs. If you haven't already,
read Adam Leventhal's paper:
http://queue.acm.org/detail.cfm?id=1670144
--
Ian.
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