'for' cycle

berndbausch · 11-20-2015, 07:25 AM

Quote:

Originally Posted by applehalf

awk '/MY_STORAGE_NAME/{print gensub(/[()]/,"","g")}' is very nice decision.
Ok once more time.
For example command iostat -kNx result is:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm util
sdc 0.00 0.00 0.00 0.00 0.00 0.00 10.77 0.00 1.80 1.78 0.00
sdt 0.00 0.00 0.00 0.00 0.00 0.00 10.98 0.00 0.56 0.54 0.00
sdg 0.00 0.00 0.00 0.00 0.00 0.00 10.56 0.00 1.19 1.18 0.00
sdx 0.00 0.00 0.00 0.00 0.00 0.00 11.12 0.00 20.51 0.51 0.00
sdk 0.00 0.00 0.00 0.00 0.00 0.00 11.31 0.00 0.73 0.73 0.00
sdab 0.00 0.00 0.00 0.00 0.00 0.00 11.00 0.00 30.66 0.64 0.00
sdo 0.00 0.00 0.00 0.00 0.00 0.00 11.38 0.00 0.87 0.86 0.00
sdaf 0.00 0.00 0.00 0.00 0.00 0.00 10.52 0.00 0.78 0.78 0.00

DISK5 (UUID_OF_DISK5) dm-1 FUJITSU,ETERNUS_DX8000
size=4.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=130 status=active
|- 2:0:15:2 sdc 8:32 active ready running
|- 3:0:12:2 sdt 65:48 active ready running
|- 2:0:16:2 sdg 8:96 active ready running
|- 3:0:15:2 sdx 65:112 active ready running
|- 2:0:17:2 sdk 8:160 active ready running
|- 3:0:20:2 sdab 65:176 active ready running
|- 2:0:18:2 sdo 8:224 active ready running
`- 3:0:21:2 sdaf 65:240 active ready running

I see that 2 pathes of one disk have await more than 10, so I want to recieve information about DISK5 (but only once, because if I have 20 disks with 16 paths each, and 10 disks have await much then 10 in all pathes, then I want to recieve 10 rows instead of 160).

A single line solution (not tested at all):

Code:

iostat 1 2 $(multipath -ll dm-1|grep running|cut -d' ' -f3) | awk '$10>0 { print "path",$1,"wait time",$10 }'

Disadvantage: It takes 2 secs per device.

berndbausch · 11-20-2015, 07:31 AM

Quote:

Originally Posted by berndbausch

A single line solution (not tested at all):

Code:

iostat 1 2 $(multipath -ll dm-1|grep running|cut -d' ' -f3) | awk '$10>0 { print "path",$1,"wait time",$10 }'

Oops I understand now that you only want one line for dm-1. Then just feed the name of dm-1 into awk. When awk finds a line with await>10, it will print "dm-1" and stop processing.

applehalf · 11-23-2015, 12:53 AM

iostat for each path of each disk?
I think it will take more time, than 5 sec.

berndbausch · 11-23-2015, 01:18 AM

Quote:

Originally Posted by applehalf

iostat for each path of each disk?
I think it will take more time, than 5 sec.

Run iostat 1 2 once for all disks, saving its output to a file, then modify my one-liner, e.g.

Code:

grep $(multipath -ll dm-1|grep running|cut -d' ' -f3) iostat.output | awk '$10>0 { print "path",$1,"wait time",$10 }'

applehalf · 11-23-2015, 02:06 AM

awk is better than cut:
-bash-4.1$ sudo multipath -a DISK_UUID -ll
DISK1 (DISK1_UUID) dm-3 MY_STORAGE_NAME
size=4.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=130 status=active
|- 2:0:18:3 sdd 8:48 active ready running
|- 3:0:6:3 sdy 65:128 active ready running
|- 2:0:20:3 sdi 8:128 active ready running
|- 3:0:13:3 sdad 65:208 active ready running
|- 2:0:21:3 sdn 8:208 active ready running
|- 3:0:27:3 sdai 66:32 active ready running
|- 2:0:22:3 sds 65:32 active ready running
`- 3:0:29:3 sdan 66:112 active ready running
-bash-4.1$ sudo multipath -a DISK1_UUID -ll |grep running |awk '{print $3}'
sdd
sdy
sdi
sdad
sdn
sdai
sds
sdan
-bash-4.1$ sudo multipath -a DISK1_UUID -ll |grep running|cut -d' ' -f5
sdd

sdi
sdad
sdn
sdai
sds
sdan
-bash-4.1$ sudo multipath -a DISK1_UUID -ll |grep running|cut -d' ' -f6

sdy

65:208

66:32

66:112

berndbausch · 11-23-2015, 06:07 AM

It looks like you're on the way to success, great!

I had not taken the successive blanks into account, which cut considers separate fields. While you could have used sed to compress sequences of blanks into a single blank, the awk solution looks more natural to me. Good job!