Saturday, January 19, 2008

secure add more space to server to store stuff

ok a standard process.

1 added 2 new drives and moved out old one
have now
mdo-md6 thus 7 raids = 8 sata drives + 1 pata drive
i used up all 8 places on the sata300 cards (4+4).

then when i put in new drives and booted up it did not find /dev/md5 (1 drive in place).
why not because it was now the device /dev/sdh1 while the
/etc/mdadm/mdadm.conf file did not have /dev/sdh1 in the first line.
so when i added it in to fix the line to say
DEVICES /dev/sd[abcdefgh]1
then we were ok and
all the old raids were found and created on bootup.

next we needed to create new raid /dev/md6.
so steps
fdisk -l
found the two new drives that did not have any formating

fdisk /dev/sde
and selected p 1 whole drive type fd
fdisk /dev/sdg
and selected p 1 whole drive type fd

then i did
mdadm -C /dev/md6 --level=1 --raid-devices=2 /dev/sd[eg]1

error device /dev/md6 not found
so i did
mknod b 9 6 /dev/md6

and then i did
mdadm -C /dev/md6 --level=1 --raid-devices=2 /dev/sd[eg]1
and it worked fine to start creating it
mkfs.ext3 /dev/md6
then we wait for the sync of the raid and the formating to happen

then we do the
creation of the new
we need the new UUID for the raid...

so i did
cp /etc/mdadm/mdadm.conf /root/mdadm.conf

mdadm -E /dev/sde1 |grep UUI >>mdadm.conf

edit the mdadm.conf so that we now use the UUID to build the raid1 for /dev/md6
made sure that the devices line had /dev/sd[abcdefgh]1 so we can build all of them
then I edited the
/etc/init.d/raid_build_mount line to assemble and mount the new raid as
`mount /dev/md6 /home/big6 `
and then we are done.

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