File Server and Raid

[ruscook]

Hi Richard,
I'm not an expert and the installer did the next step for me so we'll
need to get help on that from this list (hey folks????)

Basically as I understand it you have to have the partition marked as a
Raid partition (which you do). You also have to put a file system on it
(I'm using XFS where I can and ext2/3 where I must). You now need to use
the mdadm command to make raidsets of the corresponding raid partitions.
"man mdadm" will help, but as I said, maybe someone here can provide the
correct syntax to make this painless (ie. no errors :-)).

The following is what needs correct/validation from an expert. It is my
current understanding of the process, but as I said, I've not done it as
it worked from the installer for me.

a) format each partition (not already formatted with a file system, but
not swap of course)
b) do a) for each drive
c) use sudo mdadm command to create a raidset
d) add the source partition from sda (as I assume this is the one you've
been using todate) to each set. This is a "degraded" raid as it only has
one drive/partition in it.
e) add the mirror from the corresponding partition on sdb and allow to
raid set to resync

Then when formatted and set up as a raidset you mount the partitions as
devices and make sure (for example) /dev/md2 (counting starts from 0)
is /dev/sda3 and /dev/sdb3 and mounted as /home. Then edit /etc/fstab to
ensure it is automounted.
entry for this would be something like:

/dev/md0        /           xfs     defaults        0       1
/dev/md1        /boot       ext3    defaults        0       2
/dev/md2        none        swap    sw              0       0
/dev/md3        /home       xfs     defaults        0       2


I note you don't have a separate /boot partition. It is advisable to
have to one, simply and non-technically it helps minimise the risk of
grub getting confused and is relatively easy to repair if you get a
problem without destroying your other settings (which can happen
if /boot is part of /).


On Wed, 2006-11-15 at 06:57 +0000, Richard Brown wrote:

> Hi Russell
> 
> 
> On 15/11/06, ruscook <ruscook_oz at yahoo.com.au> wrote:
> 
>         On Tue, 2006-11-14 at 18:23 +0000, Richard Brown wrote:
>         
>         Yes don't use /home from the first  disk, edit /etc/fstab to
>         ensure that whatever partition is you want for /home is
>         mounted.
>         Please post the results of your fdisk -l command
>         
>         
>         
>         
>         Hopefully these will help.
>         
> 
> Thank you so much - yes they do help. Here is the output from fdisk
> -l:
> Disk /dev/sda: 250.0 GB, 250059350016 bytes
> 255 heads, 63 sectors/track, 30401 cylinders 
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1        1216     9767488+  83  Linux
> /dev/sda2            1217        1338      979965   82  Linux swap /
> Solaris 
> /dev/sda3            1339       30401   233448547+  fd  Linux RAID
> autodetect
> 
> Disk /dev/sdb: 250.0 GB, 250059350016 bytes
> 255 heads, 63 sectors/track, 30401 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes 
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdb1               1        1216     9767488+  83  Linux
> /dev/sdb2            1217        1338      979965   82  Linux swap /
> Solaris
> /dev/sdb3            1339       30401   233448547+  fd  Linux RAID
> autodetect 
> 
> Disk /dev/md0: 239.0 GB, 239051210752 bytes
> 2 heads, 4 sectors/track, 58362112 cylinders
> Units = cylinders of 8 * 512 = 4096 bytes
> 
> Disk /dev/md0 doesn't contain a valid partition table
> 
> I can see that /dev/sda3 is the /home partition and that it is running
> as raid. How do I mount this as /home please and then get it to stay
> mounted as /home when I boot up? I'll then need to work out how to add
> shares!
> 
> Many thanks once again for your invaluable help.
> -- 
> Rich
> http://www.cregy.co.uk
> Embracing what God does for you is the best thing you can do for him.
> Romans 12 v 1

Kind Regards Russell
==================
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sales at windsorcycles.com.au
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