Quoting Christer Solskogen <christer.solsko...@gmail.com> (from Tue,
16 Nov 2010 14:00:48 +0100):
On Tue, Nov 16, 2010 at 1:55 PM, Alexander Leidinger
<alexan...@leidinger.net> wrote:
How do you measure that nothing is read or written to it?
I used zpool iostat -v
"zpool iostat" (without -v) does not show cache filling writes to the
cache device. I do not know about -v, but I would not be surprised if
it does not show this too.
Please check with
gstat -f '^<DEVICE>$'
if there are really no reads/writes to the device (please replace <DEVICE>
with the name of your USB device, e.g. da0).
If you see writes, I would say
- this is the reason for the load
- your cache is on the way to be filled with
useful data
I see almost no writes (nor reads)
I'm not sure: you verified the output of "zpool iostat -v" with gstat
or not? If not, please do.
If gstat shows zero activity, I suggest to run 'top -S' and look at the
process(es) which consume about 10% CPU (do not take care about the idle
process). Based upon this we can maybe suggest further things to
investigate.
Heres the output of that:
CPU: 0.0% user, 0.0% nice, 11.8% system, 0.0% interrupt, 88.1% idle
Mem: 841M Active, 193M Inact, 5086M Wired, 4876K Cache, 1237M Buf, 5750M Free
Swap: 8192M Total, 8192M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 8 171 ki31 0K 128K CPU0 0 ??? 713.62% idle
5 root 5 -8 - 0K 76K zvol:i 5 401.9H 91.16% zfskern
Thanks for your time on looking into this :-)
Based upon you other answer (with -H), I would still think the L2arc
(cache) device is being filled in the background (which means there
should be something visible with gstat).
Bye,
Alexander.
--
Sorry never means having you're say to love.
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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