Date: Fri, 10 Jan 2014 08:26:46 +0100 From: Attila Nagy <bra@fsn.hu> To: 'freebsd-fs' <freebsd-fs@freebsd.org> Subject: What does ZFS write when nothing should write there? Message-ID: <52CFA0B6.7090109@fsn.hu>
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Hi,
I've created 6 zpools, each of them with zpool create -m /data/A dataA
mirror daX daY.
The machine has nothing running except sshd and my shell.
Yet, I see this in gstat:
# while ( 1 )
while? date
while? gstat -b -f 'da[0-9]+$'
while? sleep 1
while? end
Fri Jan 10 08:22:26 CET 2014
dT: 1.062s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 88 0 0 0.0 82 573 4.1 9.0 da5
0 89 0 0 0.0 83 573 4.8 9.8 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 87 0 0 0.0 81 573 2.6 5.7 da9
0 89 0 0 0.0 84 573 3.0 6.7 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:28 CET 2014
dT: 1.032s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 91 0 0 0.0 85 590 4.9 9.5 da11
0 92 0 0 0.0 86 590 5.1 10.3 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:30 CET 2014
dT: 1.020s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:32 CET 2014
dT: 1.058s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 81 0 0 0.0 76 576 1.8 4.1 da7
0 82 0 0 0.0 77 576 2.0 4.8 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:34 CET 2014
dT: 1.024s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 91 0 0 0.0 85 595 1.4 3.8 da3
0 91 0 0 0.0 85 595 1.5 3.6 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 92 0 0 0.0 86 595 2.0 5.3 da13
0 93 0 0 0.0 87 595 2.0 5.0 da14
Fri Jan 10 08:22:36 CET 2014
dT: 1.073s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 81 0 0 0.0 76 568 2.2 4.4 da1
0 82 0 0 0.0 76 568 2.2 4.5 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 88 0 0 0.0 82 568 2.1 5.7 da5
0 90 0 0 0.0 85 568 2.5 7.0 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 47 0 0 0.0 42 488 2.1 3.9 da9
0 48 0 0 0.0 43 488 2.3 4.0 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:38 CET 2014
dT: 1.010s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 94 0 0 0.0 88 603 1.7 4.6 da11
0 92 0 0 0.0 86 603 1.8 4.5 da12
3 59 0 0 0.0 55 541 3.1 4.5 da13
4 60 0 0 0.0 56 541 3.2 4.5 da14
Fri Jan 10 08:22:40 CET 2014
dT: 1.073s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 88 0 0 0.0 82 568 2.0 4.6 da5
0 87 0 0 0.0 81 568 2.0 4.5 da6
0 0 0 0 0.0 0 0 0.0 0.0 da7
0 0 0 0 0.0 0 0 0.0 0.0 da8
0 86 0 0 0.0 80 568 2.1 4.7 da9
0 86 0 0 0.0 80 568 2.5 5.3 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
Fri Jan 10 08:22:43 CET 2014
dT: 1.035s w: 1.000s filter: da[0-9]+$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0 da0
0 0 0 0 0.0 0 0 0.0 0.0 da1
0 0 0 0 0.0 0 0 0.0 0.0 da2
0 0 0 0 0.0 0 0 0.0 0.0 da3
0 0 0 0 0.0 0 0 0.0 0.0 da4
0 0 0 0 0.0 0 0 0.0 0.0 da5
0 0 0 0 0.0 0 0 0.0 0.0 da6
0 86 0 0 0.0 80 588 3.4 7.3 da7
0 85 0 0 0.0 79 588 3.5 7.6 da8
0 0 0 0 0.0 0 0 0.0 0.0 da9
0 0 0 0 0.0 0 0 0.0 0.0 da10
0 0 0 0 0.0 0 0 0.0 0.0 da11
0 0 0 0 0.0 0 0 0.0 0.0 da12
0 0 0 0 0.0 0 0 0.0 0.0 da13
0 0 0 0 0.0 0 0 0.0 0.0 da14
^C
FreeBSD 10.0-BETA1 #5 r256751
# zpool status
pool: data1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data1 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
errors: No known data errors
pool: data2
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data2 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
errors: No known data errors
pool: data3
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data3 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da5 ONLINE 0 0 0
da6 ONLINE 0 0 0
errors: No known data errors
pool: data4
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data4 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da7 ONLINE 0 0 0
da8 ONLINE 0 0 0
errors: No known data errors
pool: data5
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data5 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da9 ONLINE 0 0 0
da10 ONLINE 0 0 0
errors: No known data errors
pool: data6
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data6 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da11 ONLINE 0 0 0
da12 ONLINE 0 0 0
errors: No known data errors
pool: data7
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data7 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da13 ONLINE 0 0 0
da14 ONLINE 0 0 0
errors: No known data errors
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