Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
Skip to next slide
You can skip to the next slide in
3
Ad
×
Your browser does not support the video tag.
Skip to next slide
Ad
×
Share SlideShare
Facebook
Twitter
LinkedIn
Embed
Size (px)
Show related SlideShares at end
WordPress Shortcode
Link
LinkedIn
Facebook
Twitter
Email
Replay
Top clipped slide
1
of
65
Ad
1
of
65
Ad
Top clipped slide
![iostat
•
Block-device level (almost disk-level) I/O statistics:
$ iostat -xnz 1
[...]
r/s
0.0
1.0
w/s
11.0
381.0
r/s
0...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-13-2048.jpg?cb=1666672689)
![iostat, cont.
•
Effective tool for a class of disk issues, especially:
$ iostat -xnz 1
[...]
r/s
0.0
r/s
0.0
w/s
0.0
r...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-14-2048.jpg?cb=1666672689)
![zfsslower.d, cont.
•
Written in DTrace
[...]
fbt::zfs_read:entry,
fbt::zfs_write:entry
{
self-path = args[0]-v_path;
sel...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-23-2048.jpg?cb=1666672689)
![iosnoop
•
Traces block-device-level I/O:
# ./iosnoop
UID
PID
103 5891
103 5891
103 5891
103 5891
103 5891
[...]
•
D
BL...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-25-2048.jpg?cb=1666672689)
![iosnoop, cont.
•
Written in DTrace
[...]
io:genunix::done
/start_time[args[0]-b_edev, args[0]-b_blkno]/
{
[...]
/* fetch...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-26-2048.jpg?cb=1666672689)
![iosnoop, cont.
•
370 lines of code, mostly to process options:
USAGE: iosnoop [-a|-A|-DeghiNostv] [-d device] [-f filena...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-27-2048.jpg?cb=1666672689)
![iostacks.d
•
Just a one-liner really (could make an “iostacks.d”):
# dtrace -n 'io:::start { @[stack()] = count(); }'
dt...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-30-2048.jpg?cb=1666672689)
![iostacks.d, cont.
•
Stack recognition chart:
# dtrace -n 'io:::start { @[stack()] = count(); }'
dtrace: description 'io:...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-31-2048.jpg?cb=1666672689)
![iostacks.d, cont.
•
Stack recognition chart:
# dtrace -n 'io:::start { @[stack()] = count(); }'
dtrace: description 'io:...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-32-2048.jpg?cb=1666672689)
![iostacks.d, cont.
•
From zio, when parent == NULL (first zio):
# dtrace -n 'zio_create:entry /arg0 == NULL/ { @[stack()] ...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-33-2048.jpg?cb=1666672689)
![spasync.d, cont.
•
Written in DTrace
[...]
fbt::spa_sync:entry
/!self-start/
{
in_spa_sync = 1;
self-start = timestamp;
...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-39-2048.jpg?cb=1666672689)
![arcstat, cont.
•
Written in Perl, uses kstats (zfs::arcstats:):
[...]
sub snap_stats {
my %prev = %cur;
if ($kstat-updat...](https://image.slidesharecdn.com/zfsperftools2012-121002155151-phpapp02/75/ZFSperftools2012-44-2048.jpg?cb=1666672689)
