I'm testing Sol 10 10/08 with Ldoms 1.1. I have 2 Domains, Control Domain and a
Guest Domain. Control Domain has mirrored ZFS based root and a zvol was
created and exported to be used as root disk in the Guest Domain. Guest DOmain
boots from UFS.
I have few interestiong observations. If in the Control Domain I run mkfile to
do a 1GB file I get:
# date;mkfile 1g /eraseme5.txt;date
Wed Jan 28 23:58:58 PST 2009
Wed Jan 28 23:59:12 PST 2009
#
So it only takes 14 seconds to create such file. The output of iostat -xnz
10is:
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.1 0.0 0.1 0.0 0.0 0.0 0.0 4.1 0 0 c1t0d0
0.2 0.0 2.1 0.0 0.0 0.0 0.0 6.7 0 0 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 452.4 0.0 57123.8 0.0 24.8 0.0 54.7 2 74 c1t0d0
0.0 451.3 0.0 56957.4 0.0 24.9 0.0 55.2 2 75 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.1 310.9 0.1 38632.6 0.0 16.6 0.0 53.3 1 52 c1t0d0
0.0 312.0 0.0 38799.0 0.0 16.7 0.0 53.5 1 53 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.2 0.0 0.4 0.0 0.0 0.0 0.0 0.1 0 0 c1t0d0
Please have a look that here there are only writes (as expected).
When I do same operation but from guest domain I get:
# date;mkfile 1g /eraseme7.txt;date
Thu Jan 29 00:09:26 PST 2009
Thu Jan 29 00:10:25 PST 2009
#
So the operation takes 1 minute (vs. 15 seconds) . Now the iostat -xnz 5 from
the control domain itself looks like:
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.8 0.0 44.8 0.0 0.0 0.0 0.0 6.2 0 0 c1t0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
497.9 52.8 7873.6 6184.9 0.0 3.6 0.0 6.6 1 29 c1t0d0
607.6 54.9 7962.4 6479.3 0.0 3.7 0.0 5.5 2 35 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
149.1 94.1 2223.1 10932.8 0.0 5.5 0.0 22.5 1 23 c1t0d0
147.4 91.5 2148.7 10638.4 0.0 5.5 0.0 23.2 1 24 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
242.8 281.9 4040.9 33253.6 0.0 16.4 0.0 31.3 2 61 c1t0d0
225.3 283.0 3841.7 33253.6 0.0 17.9 0.0 35.3 2 65 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
421.7 156.2 6848.2 17338.3 0.0 10.4 0.0 18.0 2 44 c1t0d0
451.3 156.9 6908.2 17317.2 0.0 10.4 0.0 17.1 2 44 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
507.6 98.3 9587.8 11325.4 0.0 7.0 0.0 11.5 2 37 c1t0d0
484.2 97.3 9679.0 11346.5 0.0 9.8 0.0 16.8 1 46 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
469.3 196.2 6280.1 22790.5 0.0 11.9 0.0 17.8 2 51 c1t0d0
529.8 196.4 6750.5 22790.5 0.0 12.2 0.0 16.7 2 53 c1t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
1.3 0.0 10.4 0.0 0.0 0.0 0.0 4.7 0 1 c1t0d0
0.2 0.0 2.6 0.0 0.0 0.0 0.0 7.8 0 0 c1t1d0
I wonder why in this case I see reads and writes. As you see above when I do
the operation from control domain there are only writes.
The iostat -xnz 10 reported in the guest domain itself looks:
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 60.2 0.0 7394.3 0.0 36.8 0.0 610.5 0 38 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 136.2 0.0 17011.3 0.0 101.9 0.0 748.0 0 100 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 243.9 0.0 30075.7 0.0 85.4 0.0 350.2 0 99 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 141.0 0.0 16751.8 0.0 102.2 0.0 724.7 0 100 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 81.5 0.0 10010.4 0.0 114.2 0.0 1401.4 0 100 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 156.5 0.0 19381.6 0.0 94.9 0.0 606.5 0 100 c0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.1 42.6 0.8 4510.5 0.0 62.8 0.0 1471.1 0 63 c0d0
#
Here only writes are reported. However the response time looks in the high
side.
Any opinion on this?
Thanks and Regards
Luis
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