[OmniOS-discuss] L2ARC actual size and zpool iostat -v output discrepancy?
wuffers
moo at wuffers.net
Wed Feb 12 18:11:21 UTC 2014
On Wed, Feb 12, 2014 at 10:55 AM, Saso Kiselkov <skiselkov.ml at gmail.com>wrote:
Can you also try running this piece of dtrace on the machine? I have a
> hypothesis that I'd like to test:
>
> dtrace -n 'fbt::l2arc_evict:entry{printf("dev=%p; l2ad_first=%d",
> args[0], args[0]->l2ad_first)}'
>
> (let it run for about 5-10s and post the output)
>
Output from the above dtrace:
dtrace: description 'fbt::l2arc_evict:entry' matched 1 probe
CPU ID FUNCTION:NAME
12 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
12 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
12 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
14 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
5 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
5 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
19 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
21 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
23 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
11 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
13 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
14 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
15 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
19 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
16 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
13 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
3 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
21 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
2 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
18 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
2 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
2 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
2 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
20 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
2 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
0 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
8 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
1 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
4 40955 l2arc_evict:entry dev=ffffff4377e25058;
l2ad_first=1
14 40955 l2arc_evict:entry dev=ffffff4377e25148;
l2ad_first=1
12 40955 l2arc_evict:entry dev=ffffff432153be68;
l2ad_first=1
21 40955 l2arc_evict:entry dev=ffffff43782a8240;
l2ad_first=1
And on your other question:
> What's the block size of your SSDs and the average recordsize of the
> data on them?
I'm actually not sure what you're asking about.. the recordsize on the pool
itself? It's 128K. I have different volblocksize on various volumes. Or
information about the SSD itself?
* /dev/rdsk/c2t500117310015D579d0 partition map
*
* Dimensions:
* 512 bytes/sector
* 781422768 sectors
* 781422701 accessible sectors
*
* Flags:
* 1: unmountable
* 10: read-only
*
* Unallocated space:
* First Sector Last
* Sector Count Sector
* 34 222 255
*
* First Sector Last
* Partition Tag Flags Sector Count Sector Mount Directory
0 4 00 256 781406095 781406350
8 11 00 781406351 16384 781422734
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