My survival notes... : 2012

mercredi 19 décembre 2012

apply command (in AIX only?)

Here is a fast way to do function loop :

apply "ssh server%1_pers date" 2 3 5 6 7 8

Replaces %1 with following parameters

same as :

for i in 2 3 5 6 7 8
do
ssh server${i}_pers date
done

Exclude files or directories from commands

An easy way to remove elements from command line :

root:/# rm !(*.c|*.h) => remove every files except *.c or *.h)

another syntax :

root:/# rm !(*.@(c|h)) => same thing ...

Can be used with grep, for directories exlusion. :

root:/# grep P770_P7_1_A30 !(www|logs)/* => grep P770_P7_1_A30 from every underlying directories, except www and logs

jeudi 18 octobre 2012

Be sure to be on different switchs !

It's good to have more than one fcs adapter... but it's better to be sure they are connected on different switchs !
Each id is different, if it is on another switch

in this case we have two adapters (or 2 ports on the same card):

root:/# lsdev -c adapter | grep fcs
fcs0   Available 30-T1 Virtual Fibre Channel Client Adapter
fcs1   Available 31-T1 Virtual Fibre Channel Client Adapter

but on the same vio server ! ....

root:/# echo "vfcs" | kdb
           START              END
0000000000001000 0000000005770000 start+000FD8
F00000002FF47600 F00000002FFDF9C0 __ublock+000000
000000002FF22FF4 000000002FF22FF8 environ+000000
000000002FF22FF8 000000002FF22FFC errno+000000
F1000F0A00000000 F1000F0A10000000 pvproc+000000
F1000F0A10000000 F1000F0A18000000 pvthread+000000
read vscsi_scsi_ptrs OK, ptr = 0xF1000000C01A9380
(0)> vfcs
NAME      ADDRESS             STATE   HOST      HOST_ADAP OPENED NUM_ACTIVE
fcs0      0xF10001019999A000 0x0008 vioprex1vfchost2 0x01    0x0000
fcs1      0xF10001019A3AC000 0x0008 vioprex1vfchost3 0x01    0x0000and on the same swicth !!!

root:/# lsattr -El fscsi0
attach       switch    How this adapter is CONNECTED         False
dyntrk       yes       Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0x340206 Adapter SCSI ID                       False
sw_fc_class 3         FC Class for Fabric                   True
root:/# lsattr -El fscsi1
attach       switch    How this adapter is CONNECTED         False
dyntrk       yes       Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0x340501 Adapter SCSI ID                       False
sw_fc_class 3         FC Class for Fabric                   True

this other partition is ok :

# lsattr -El fscsi0
attach       switch    How this adapter is CONNECTED         False
dyntrk       yes       Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0x1db40   Adapter SCSI ID                       False
sw_fc_class 3         FC Class for Fabric                   True
# lsattr -El fscsi1
attach       switch    How this adapter is CONNECTED         False
dyntrk       yes       Dynamic Tracking of FC Devices        True
fc_err_recov fast_fail FC Fabric Event Error RECOVERY Policy True
scsi_id      0x20db40 Adapter SCSI ID                       False
sw_fc_class 3         FC Class for Fabric                   True

Merci Patrice, pour l'info !

patch alt_disk install image

create disk copy :

alt_disk_copy -O -B -d "hdisk25 hdisk26"

wake up disk copy :

alt_rootvg_op -W -d hdisk25

update alternate disk copy :

alt_rootvg_op -C -b update_all -l /updates/5300-12-04

close alternate disk copy, and bosboot it:

alt_rootvg_op -St

how to find the underlying vio server

I need to know, from a partition, how to find which vio server it relies on :

We need to use kdb :

on Npiv servers

root @test # echo "vfcs" | kdb
           START              END
0000000000001000 0000000004090000 start+000FD8
F00000002FF47600 F00000002FFDF9C0 __ublock+000000
000000002FF22FF4 000000002FF22FF8 environ+000000
000000002FF22FF8 000000002FF22FFC errno+000000
F1000F0A00000000 F1000F0A10000000 pvproc+000000
F1000F0A10000000 F1000F0A18000000 pvthread+000000
read vscsi_scsi_ptrs OK, ptr = 0x0
(0)> vfcs
NAME      ADDRESS             STATE   HOST      HOST_ADAP OPENED NUM_ACTIVE
fcs0      0xF1000A0000156000 0x0008 vioserver1vfchost0 0x01    0x0000
root @test #

on vscsi servers

root @test # echo "cvai" | kdb | grep vscsi

Preserving 30612 bytes of symbol table [./usr/lib/drivers/vscsi_initdd]

read vscsi_scsi_ptrs OK, ptr = 0xF1000000A0138378

vscsi0 0x000007 0x0000000000 0x0 vio73->vhost7

vscsi1 0x000007 0x0000000000 0x0 vio74->vhost7

Some stuff....

SED : (merci nico)

to remove, with a sed command, every thing before the dot :

echo " aaa.bbb" | sed 's/^.*\.//g'
bbb

^ = from the line beginning
. = one caracter

.* (dot with *) every caracters

Python :

I have the following file, which contains server names, and dates.

root@test # cat file
server_a
09192012
09292012
09302012
server_b
04022012
04082012
04262012
10072012
...

The date is american format, so i need to convert it in europeen format, so
reverse chain 2 by 2 (convert date from mmddyyyy to ddmmyyyy)

the simplest python command to do that is :

>>> x=06242012
>>>x=x[2:4:]+x[0:2:]+x[4:8::]
>>> x
'24062012'

As i need to use it on the command line, to process a verrryy large file, i built a simple python file :

root@test #cat conv.py

#!/bin/python
# -*-coding:utf-8 -*

import sys
for line in sys.stdin:
        line=line.strip("\r\n") # need to remove trailing \n because my var is not numbers if there is a \n
        if line.isdigit():          # we only rework lines that are numbers
                line=line[2:4:]+line[0:2:]+line[4:8:]
        print line

root@test #cat file | ./conv.py

server_a
19092012
29092012
30092012
server_b
22022012
18042012
26042012
07102012
...
job's done...

same stuff with perl (one liner!) (merci Guigui)

root@test #echo 09192012 | perl -ne "s/(\d\d)(\d\d)(\d\d\d\d)/\2\/\1\/\3/;print"
19/09/2012

mardi 10 avril 2012

How to find the devices in pre defined subclass

root @ test # lsdev -P -H

PCM            iscsiother      friend         SCSI/FCP Disk Path Control Module
PCM            sasother        friend         SCSI/FCP Disk Path Control Module
PCM            scsiscsd        friend         SCSI/FCP Disk Path Control Module
PCM            sisarray        friend         SCSI/FCP Disk Path Control Module
adapter        df1000fa        pci            FC Adapter
adapter        df1000fd        pci            FC Adapter
adapter        df1000f114108a0 pciex          8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
cdrom          oscd            fcp            Other FC SCSI CD-ROM Drive

mardi 20 mars 2012

TTL et cache DNS

Si on interroge un dns cache, et qu'aucun des primaires ne connait l'adresse demandée, il y aura un TTL avant de pouvoir vraiment redécouvrir l'adresse, une fois que celle ci sera connue dans un DNS. Ce TTL se déclenche à la premiere interrogation (ici il est de 3600 secondes):

darkstar:root:# dig +nocmd toto.titi.zzz.fr +answer

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 1094

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:

;toto.titi.zzz.fr. IN A

;; AUTHORITY SECTION:

Titi.zzz.fr. 3600 IN SOA toto.titi.zzz.fr. admin. 2913617 900 600 86400 3600

;; Query time: 14 msec

;; SERVER: 192.168.0.244#53(192.168.0.244)

;; WHEN: Tue Mar 20 07:21:54 2012

;; MSG SIZE rcvd: 99