====== Cluster ======



  ***Cluster maintenance update** (see //"Storage in HA: manutenzione ordinaria e straordinaria."//, RT N.41, febbraio 2012, Ceris-CNR([[http://www2.ceris.cnr.it/ceris/rapportitecnici/2012/RT_41_12_BIRELLO.pdf|PDF]]))


* SystemRescue 3.1.1 changes **disk naming** from /dev/cciss/c0dx to /dev/sdy (e.g. /dev/cciss/c0d0p2 -> /dev/sda2).
\\
Node backup:

<WRAP prewrap center>
<code>
root@uclu2:~# crm node standby uclu2
root@uclu2:~# reboot [insert SystemRescue USB]
</code>
</WRAP>
From SystemRescue:
<WRAP prewrap center>
<code>
# mount /dev/sdc2 /mnt/backup
# fsarchiver -vo savefs /mnt/backup/uclu2.fsa /dev/sda1
# umount /mnt/backup
# reboot [remove SystemRescue USB]
</code>
</WRAP>

* After DRBD package update:

It is very important to **remove startup script BEFORE reboot** to avoid cluster re-sync and/or spli-brain:

<WRAP prewrap center>
<code>
# update-rc.d -f drbd remove
</code>
</WRAP>