The drives are all connected to the motherboard's (Intel S3210SHLX) SATA ports.
I've scrubbed the pool several times in the last two days, no errors:
[EMAIL PROTECTED]:~# zpool status -v
pool: main_pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
main_pool ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c5t5d0 ONLINE 0 0 0
c5t3d0 ONLINE 0 0 0
c5t4d0 ONLINE 0 0 0
c5t2d0 ONLINE 0 0 0
c5t1d0 ONLINE 0 0 0
errors: No known data errors
I appreciate your feedback, I had not thought to aggregate the stats
and check the aggregate.
Thanks,
Charles
On Fri, Nov 21, 2008 at 3:24 PM, Will Murnane <[EMAIL PROTECTED]> wrote:
> On Fri, Nov 21, 2008 at 14:35, Charles Menser <[EMAIL PROTECTED]> wrote:
>> I have a 5 drive raidz2 pool which I have a iscsi share on. While
>> backing up a MacOS drive to it I noticed some very strange access
>> patterns, and wanted to know if what I am seeing is normal, or not.
>>
>> There are times when all five drives are accessed equally, and there
>> are times when only three of them are seeing any load.
> What does "zpool status" say? How are the drives connected? To what
> controller(s)?
>
> This could just be some degree of asynchronicity showing up. Take a
> look at these two:
> capacity operations bandwidth
> pool used avail read write read write
> ---------- ----- ----- ----- ----- ----- -----
> main_pool 852G 3.70T 361 1.30K 2.78M 10.1M
> raidz2 852G 3.70T 361 1.30K 2.78M 10.1M
> c5t5d0 - - 180 502 1.25M 3.57M
> c5t3d0 - - 205 330 1.30M 2.73M
> c5t4d0 - - 239 489 1.43M 2.81M
> c5t2d0 - - 205 17 1.25M 26.1K
> c5t1d0 - - 248 13 1.41M 25.1K
> ---------- ----- ----- ----- ----- ----- -----
>
> capacity operations bandwidth
> pool used avail read write read write
> ---------- ----- ----- ----- ----- ----- -----
> main_pool 852G 3.70T 10 2.02K 77.7K 15.8M
> raidz2 852G 3.70T 10 2.02K 77.7K 15.8M
> c5t5d0 - - 2 921 109K 6.52M
> c5t3d0 - - 9 691 108K 5.63M
> c5t4d0 - - 9 962 105K 5.97M
> c5t2d0 - - 9 1.30K 167K 8.50M
> c5t1d0 - - 2 1.23K 150K 8.54M
> ---------- ----- ----- ----- ----- ----- -----
>
> For c5t5d0, a total of 3.57+6.52 MB of IO happen: 10.09 MB;
> For c5t3d0, a total of 2.73+5.63 MB of IO happen: 8.36 MB;
> For c5t4d0, a total of 2.81+5.97 MB of IO happen: 8.78 MB;
> For c5t2d0, a total of (~0)+8.50 MB of IO happen: 8.50 MB;
> and for c5t1d0, a total of (~0) + 8.54 MB of IO happen: 8.54 MB.
>
> So over time, the amount written to each drive is approximately the
> same. This being the case, I don't think I'd worry about it too
> much... but a scrub is a fairly cheap way to get peace of mind.
>
> Will
>
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