This may not be a ZFS issue, so please bear with me!
I have 4 internal drives that I have striped/mirrored with ZFS and have an
application server which is reading/writing to hundreds of thousands of files
on it, thousands of files @ a time.
If 1 client uses the app server, the transaction (reading/writing to ~80 files)
takes about 200 ms. If I have about 80 clients attempting it @ once, it can
sometimes take a minute or more. I'm pretty sure its a file I/O bottleneck so
I want to make sure ZFS is tuned properly for this kind of usage.
The only thing I could think of, so far, is to turn off ZFS compression. Is
there anything else I can do? Here is my "zpool iostat" output:
# zpool iostat 5
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
pool1 5.69G 266G 23 76 1.44M 2.24M
pool1 5.69G 266G 96 259 5.70M 7.25M
pool1 5.69G 266G 98 267 5.73M 7.32M
pool1 5.69G 266G 92 253 5.76M 7.31M
pool1 5.69G 266G 90 254 5.67M 7.43M
and here is regular iostat:
# iostat -xnz 5
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.2 0.0 0.1 0.0 0.0 0.0 0.3 0 0 c0t0d0
0.0 0.2 0.0 0.1 0.0 0.0 0.0 0.3 0 0 c0t1d0
20.4 145.0 1315.8 3714.5 0.0 2.8 0.0 16.8 0 21 c0t2d0
21.4 143.2 1380.2 3711.3 0.0 4.1 0.0 25.1 0 27 c0t3d0
23.4 138.4 1509.3 3693.0 0.0 1.6 0.0 9.8 0 17 c0t4d0
20.8 137.8 1341.6 3693.0 0.0 2.3 0.0 14.7 0 21 c0t5d0
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