On Sat, Jul 5, 2008 at 9:48 PM, Brian Hechinger <[EMAIL PROTECTED]> wrote:
> On Sat, Jul 05, 2008 at 03:03:34PM -0500, Mike Gerdts wrote:
>> $ kstat -p ::vopstats_zfs:{nread,read_bytes,nwrite,write_bytes}
>> unix:0:vopstats_zfs:nread 418787
>> unix:0:vopstats_zfs:read_bytes 612076305
>> unix:0:vopstats_zfs:nwrite 163544
>> unix:0:vopstats_zfs:write_bytes 255725992
This was on a virtual machine with a 12 GB zpool (one virtual disk)
that had been up for a few days (but suspended most of the time). My
guess is that most of the activity my zpool was seeing was from the
swap device.
> # kstat -p ::vopstats_zfs:{nread,read_bytes,nwrite,write_bytes}
> #
>
> uhm, but:
>
> kstat -p ::vopstats_zfs
> [snip]
> unix:0:vopstats_zfs:nwrite 24201307
24 million write operations.
> unix:0:vopstats_zfs:read_bytes 1557032944566
$ perl -e 'print (1557032944566 >> 30)'
1450
Looks like you've read about 1.4 TB since boot.
> unix:0:vopstats_zfs:readdir_bytes 1292670000
1.2 GB of readdir activity. Lots of files? Is someone doing find or
du through the area with lots of files?
> unix:0:vopstats_zfs:snaptime 3281423.01228961
> unix:0:vopstats_zfs:write_bytes 222641182203
$ perl -e 'print (222641182203 >> 30)'
207
207 MB of writes.
$ perl -e 'print 222641182203 / 24201307'
9199.55199952631
Average write size was a bit over 9 KB.
>
> what gives? This is:
>
> SunOS wiggum.4amlunch.net 5.11 snv_81 i86pc i386 i86pc
Do the numbers seem unreasonable for the size of the pool, the uptime
of the system, etc.? Remember my comments earlier about how you can
now see the reads (and readdirs) that came from cache and didn't do
physical I/O.
--
Mike Gerdts
http://mgerdts.blogspot.com/
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