Fernando Costa

How to recover a LV after mirror failure.

Way 1 – If you don’t have another devide to recover the mirror
*** always remember to check /etc/lvm/backup directory. ***

Try to activate all lvs:

# vgchange -ay

you’ll receive some errors like this:

Couldn’t find device with uuid ‘4bpgtD-txaN-rL2o-Mlii-0zx3-aGJB-DMTxco‘.

you can try to activate the lv in read-only mode. For example to do a backup of files into the lv:

# lvchange -ay /dev/vg00/testlv –partial
# mount /dev/vg00/testlv /mountpoint

and them you have to umount, deactivate the lv and remove missing pvs:

# umount /mountpoint

#lvchange -an /dev/vg00/testlv

#vgreduce –removemissing –force vg00

check if that errors are gone:

[root@localhost test]# pvs
PV         VG     Fmt  Attr PSize PFree
/dev/hdb   vg00   lvm2 a-   2.00G 1.96G
[root@localhost test]#

activate the lv and be happy:

# lvchange -ay /dev/vg00/testlv
# mount /dev/vg00/testlv /mountpoint

Way 2 – If you have another device to recover the mirror

find the UUID for the physical volume that are missing:

[root@localhost lvm]# pvs
Couldn’t find device with uuid ‘Bm8kJh-GJjL-aYbr-HI3K-EqnX-xOJA-wX3NbD‘.
.

.

[root@localhost lvm]#

Look into the diretory /etc/lvm/archive for the last known valid archived LVM metadata for that volume group.

Use the –uuid and –restorefile arguments of the pvcreate command to restore the physical volume:

[root@localhost lvm]# pvcreate –uuid “Bm8kJh-GJjL-aYbr-HI3K-EqnX-xOJA-wX3NbD” –restorefile /etc/lvm/archive/vg00_00017.vg /dev/hdd
Couldn’t find device with uuid ‘Bm8kJh-GJjL-aYbr-HI3K-EqnX-xOJA-wX3NbD’.
Physical volume “/dev/hdd” successfully created

[root@localhost lvm]#

Restore the VG configuration:

[root@localhost lvm]# vgcfgrestore vg00
Restored volume group vg00
[root@localhost lvm]#

Check if everything is ok:

[root@localhost test]# lvs -a -o +devices | grep testlv
testlv            vg00   mwi-ao  32.00M                        100.00         testlv_mimage_0(0),testlv_mimage_1(0)
[testlv_mimage_0] vg00   iwi-ao  32.00M                                       /dev/hdb(0)
[testlv_mimage_1] vg00   iwi-ao  32.00M                                       /dev/hdd(0)
[root@localhost test]#

Activate the volumes and mount:

[root@localhost test]# lvchange -ay /dev/vg00/testlv
[root@localhost test]# mount /dev/vg00/testlv /mountpoint

bye

On AIX 4.3 you have to calculate how many blocks it will be necessary.

If you want to increase 64M you have to do:

64 x 2048 = 131072 blocks

The final command would be:

chfs -a size=+131072 /FILESYSTEM

Very simple and useful.

To get wwpn on RHEL (Red Hat) 5.3 just run this command:

# cat /sys/class/fc_host/host*/port_name

Output :

[root@xxxx ~]# cat /sys/class/fc_host/host*/port_name
0x10000000c985e038
0x10000000c985e03a
[root@xxxx ~]#

In this case I have 2 HBA’s. The wwpn numbers are:

10:00:00:00:c9:85:e0:38

10:00:00:00:c9:85:e0:3a

regards,

Fernando Costa

On Solaris you sometimes get this error in vi:

Terminal too wide

One solution is to increase the number of the columns. Just run this command:

# stty columns 120

Or you can install vim (i think it’s better).

good luck!

Fernando Costa

A small but very usefull tip:

1 ) Get informations about the eth0:

# ethtool eth0

output:

[root@xxxx ~]# ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes:   10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes:  Not reported
Advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Half
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Link detected: yes
[root@xxxx ~]#

Read more…

Procedure to replace a mirrored disk on AIX

ps: Just for example I will use rootvg and hdisk1

1 ) Remove the disk from the mirror

# unmirrorvg -c1 rootvg hdisk1

2 ) Remove the boot area from hdisk1

# chpv -c hdisk1

3 ) Verify the unmirrored data

# lspv -l hdisk1

4 ) Move all that remained in hdisk1 to hdisk0

# migratepv hdisk1 hdisk0

Read more…

Introdução:

Este tutorial apresenta uma forma de conectar a VPN Check-Point utilizando uma ferramenta Opersource. Como exemplo de conexão podemos citar a VPN solicitada pela CCEE para auditoria no mercado de energia.

Pré-requisitos:

Instale alguma distribuição Linux (ou até um UNIX) de sua preferência. Para o tutorial foi utilizado o debian etch.

Instalando os Softwares necessários:

# apt-get install racoon ipsec-tools

Read more…

Introdução:
pkg-get é um sistema de gerenciamento de pacotes bem parecido com o APT (debian) para Solaris. Seu objetivo principal é facilitar a nossa vida, tornando as tarefas de instalação, atualização e remoção de pacotes menos árdua.

Instalando o software:
Vamos baixá-lo em http://www.blastwave.org/

# pkgadd -d http://www.blastwave.org/pkg_get.pkg

Será mostrada a seguinte tela (siga os exemplos):

1 – Select package(s) you wish to process (or ‘all’ to process all packages). (default: all) [?,??,q]: all

2 – Do you want this directory created now [y,n,?,q] y

3 – Do you want to continue with the installation of <CSWpkgget> [y,n,?] y

Instale o wget

# /opt/csw/bin/pkg-get -i wget

Editanto o PATH:
Edite os arquivos /etc/default/login e /etc/default/su alterando adicionando /opt/csw/bin ao PATH.

Pronto, agora basta utilizar pkg-get -i PACOTE para instalar, de maneira simples, o que precisar.

Bom dessa vez vou ser direto (sem introdução) pois o tempo está muito curto.

Instalando o Banco:

# apt-get install firebird2-super-server firebird2-utils-super firebird2-dev

Alterando a senha do sysdba:

Para alterar a senha do usuário sysdba utilizaremos um utilitário chamado gsec:

# /usr/lib/firebird2/bin/gsec -user sysdba -password masterkey

GSEC> modify sysdba -pw novasenha

GSEC> quit

Read more…

Seguem alguns comandos para configuração de LVM

Instalando o LVM:

# apt-get install lvm2

Scaneando os discos, a procura de PV’s e VG’s:

# vgscan

Read more…