On 10/16/10 12:29 PM, Marty Scholes wrote:
On Fri, Oct 15, 2010 at 3:16 PM, Marty Scholes
<martyscho...@yahoo.com> wrote:
My home server's main storage is a 22 (19 + 3) disk
RAIDZ3 pool backed up hourly to a 14 (11+3) RAIDZ3
backup pool.
How long does it take to resilver a disk in that
pool? And how long
does it take to run a scrub?
When I initially setup a 24-disk raidz2 vdev, it died
trying to
resilver a single 500 GB SATA disk. I/O under 1
MBps, all 24 drives
thrashing like crazy, could barely even login to the
system and type
onscreen. It was a nightmare.
That, and normal (no scrub, no resilver) disk I/O was
abysmal.
Since then, I've avoided any vdev with more than 8
drives in it.
MY situation is kind of unique. I picked up 120 15K 73GB FC disks early this
year for $2 per. As such, spindle count is a non-issue. As a home server, it
has very little need for write iops and I have 8 disks for L2ARC on the main
pool.
I'd hate to be paying your power bill!
Main pool is at 40% capacity and backup pool is at 65% capacity. Both take
about 70 minutes to scrub. The last time I tested a resilver it took about 3
hours.
So a tiny fast drive takes three hours, consider how long a 30x bigger,
much slower drive will take.
--
Ian.
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