Squeezebox Setup

Mounting the RAID array

The new RAID array will act as a data drive for the new system. To do this I’m going to mount it as /home. There are lots of options here – you could create a /data directory and map to that instead, but my preference is a combination of functional and user accounts in /home for all program and user data. Mounting the drive will involve editing fstab again – so a final performance tweak will be made too. Note that potentially if you lose power this tweak will mean that you may lose a few seconds of data.

First edit the fstab file. Note that we are adding the data=writeback to both the system and the new data drive – so an addition to the system drive line, and a new line underneath to mount /home. So fstab should end up like:

/dev/VolGroup00/LogVol00 / ext3 defaults,noatime,nodiratime,data=writeback 1 1
/dev/raiddata/lvm0 /home ext3 defaults,noatime,nodiratime,data=writeback 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0

In order to use the data writeback option successfully we also need to change the grub (bootloader) options. To do this edit the /boot/grub/menu.lst and add a writeback option. The menu.lst file will look like this:

# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
title CentOS (2.6.18-128.el5)
	root (hd0,0)
	kernel /vmlinuz-2.6.18-128.el5 ro quiet splash rootflags=data=writeback root=/dev/VolGroup00/LogVol00
	initrd /initrd-2.6.18-128.el5.img

After editing the file you need to update the config:

[root@tranquilpc grub]# grub-install /dev/sda
Installation finished. No error reported.
This is the contents of the device map /boot/grub/device.map.
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install’.

# this device map was generated by anaconda
(hd0) /dev/sda

Finally tunefs needs to be run on the two drives. Note that not doing this will probably mean that your filesystem will be mounted read only on a reboot.

[root@tranquilpc home]# tune2fs -o journal_data_writeback /dev/mapper/VolGroup00-LogVol00
tune2fs 1.39 (29-May-2006)
[root@tranquilpc home]# tune2fs -o journal_data_writeback /dev/mapper/raiddata-lvm0
tune2fs 1.39 (29-May-2006)
[root@tranquilpc home]#

At this point when you reboot all should be good. To reboot you can either power off and on, or do:

[root@tranquilpc home]# shutdown -r now

After a reboot you should see everything ok with mount -l, or df -k.

[root@tranquilpc home]# mount -l
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw,noatime,nodiratime,data=writeback)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/mapper/raiddata-lvm0 on /home type ext3 (rw,noatime,nodiratime,data=writeback)
/dev/sda1 on /boot type ext3 (rw) [/boot]
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
[root@tranquilpc home]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
33740528 1024848 30974064 4% /
961428808 204572 961224236 1% /home
/dev/sda1 101086 12015 83852 13% /boot
tmpfs 1032840 0 1032840 0% /dev/shm
[root@tranquilpc home]#


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