[Tutor] how to grep a word and make a dictionary from multiple lines.

[David Rock]

* Fosiul Alam <fosiul at gmail.com> [2016-01-05 09:46]:
> Hi
> so the logic will be like bellow :-
> 
> a)Start to read the file,
> b)start a line which start with  "3600601"
> c) Iterate through the line till i see another line which starts with
> "3600601"
> d) read the last line before 3600601
> e)cut all the path and create a dictionary which will have one key (LUN ID
> 3600601 ) and multiple values (PATH
> *0:0:0:129,**1:0:0:129,*0:0:2:129,1:0:2:129)
> 
> f) then look up each dictinary by Values(*0:0:0:129) * to get the required
> LUN ID
> 
> does the logic sound right ?
> 
> mpathdz (360060165656565634348a739e511) dm-134 DGC,VRAID
> size=200G features='0' hwhandler='1 alua' wp=rw
> |*-+- policy='round-robin 0' prio=130 status=active
> *|* |- 0:0:0:129 sddz  128:16   active ready running
> *|* `- 1:0:0:129 sdwd  69:656   active ready running
> *`-+- policy='round-robin 0' prio=10 status=enabled
>   |- 0:0:2:129 sdnd  70:496   active ready running
>   `- 1:0:2:129 sdafg 68:864   active ready running
> mpathcu (3600601323h42h2k323asdf33511) dm-103 DGC,VRAID
> size=200G features='0' hwhandler='1 alua' wp=rw
> |*-+- policy='round-robin 0' prio=130 status=active
> *|* |- 1:0:2:98  sdaeb 66:880   active ready running
> *|* `- 0:0:2:98  sdly  69:256   active ready running
> *`-+- policy='round-robin 0' prio=10 status=enabled
>   |- 0:0:0:98  sdcu  70:32    active ready running
>   `- 1:0:0:98  sduy  67:672   active ready running
> mpathbp (36003434343eere8b69e411) dm-36 DGC,RAID 5
> size=100G features='0' hwhandler='1 alua' wp=rw
> |*-+- policy='round-robin 0' prio=130 status=active
> *|* |- 0:0:0:68  sdbq  68:64    active ready running
> *|* `- 1:0:0:68  sdtu  65:704   active ready running
> *`-+- policy='round-robin 0' prio=10 status=enabled
>   |- 0:0:2:68  sdku  67:288   active ready running
>   `- 1:0:2:68  sdacx 8:912    active ready running

If that's what you need, then that would probably work (more or less).
A few issues to make sure you address:

1. not all multipath entries start with "3600601".  mpathbp, for
example, is "3600343".  You would probably be better off looking for
"mpath"

2. looking up by value would work, but maybe you should do it the other
direction.  Your SCSI values will be unique, so use that as the key


a "simpler" logic is probably:

a) read file
b) store the LUN value from your mpath line
c) iterate over lines and find SCSI key, then apply the LUN as the value
for the key
d) when you hit a new mpath line, simply update your LUN value and keep
going

Then you can look up your LUN by SCSI key directly.

-- 
David Rock
david at graniteweb.com