Lnux LVM problem

[s_hcl]

I had installed 2 hdds-IDE ,40 gb on red hat linux enterprise 4.I used LVM to combine both the hdds.I had configured it as

below

/boot /dev/hdc1 200 mb -- This was not a part of LVM

/dev/hdc2 LVMPV 37966 mb
/dev/hdd1 LVPM 38162 mb --both hdds created as physical vol

volgropu00 free space 76.32.00mb

logvol01 /var ext3 8384
logvolo3 swap 512
logvol02 / ext3 8512
logvol00 .home ext3 54016

rest partition ,i had kept free ,for future expansion.


When i created swap partition in the volgroup00 ,it didnt showup as Swap.
I created a grub bootloader and installed the packages.

I could boot into linux GUI mode ,and then changed it to runlevel 3.

I faced the following problems
***
1)When i tried to mount a cdrom ,it gave an error as check /etc/fstab and /etc/mtab
Normally i think,it should have been added

2)When i was in the text mode ,sometimes the sytem used to crash and reboot.

Where am i going wrong .kindly help.

[Outlaw]

Where are you trying to view the swap? Try this:

sudo /sbin/swapon -s
Filename Type Size Used Priority/dev/mapper/sys-swap partition 2031608 0 -1

Also in the GUI under system tools you can use the LVM tool to view what you have set up.

For the CDROM issue, post your fstab. Other than those, it's really hard to blame the problems on LVM, but can't rule it out I suppose.

[s_hcl]

hi
i had again reformatted the system ,but the prob was not with the swap space ,It was with the cdrom drive.Due to bad cdrom drive the system was crashing with an error "buffer i/o error on device hda ,sector 0"

Thks for telling me to look in the fstab ,since from there i found out that in rhel 4
to mount cdrom ,it is

mount /media/cdrom

Reg the command which u gave me for swap space is good ,the o/p is as below

/dev/mapper/volgroup000 -logvol03 partition 688120 0 -1

The only problem is that ,there would be no redundancy if one of the hdd crashes.

Any ideas of implementing software raid1 or raid5 on lvm.repectively.

Also ,i read thru some articles which mentioned that /boot can only be a member of raid 1 .Is it the same for hardware raid .

[Schotty]

You can do sofware raid, but I wouldnt rely on it.

Have you looked at the following sites for a decent solution?

http://www.linux-backup.net/
http://www.mondorescue.org/

[s_hcl]

I will check the sites.

Bur ithink i should go for some form of raid ,as data redundacy is a must ,since if any one hdd fails ,it will be a prob.

[Schotty]

Redundancy isnt needed if you can copy it over to another working system (or reformat).

What I do is backup the data and setup a kickstart disk that does an install off of the dvd of just what I need, and then I can run a yum upgrade. Eventually I will get to the point where I am making a yum server that doles the updates to the servers, and I can generate a new install update dvd while the kickstart is going on each server.

In due time I suppose ....

[s_hcl]

Thks for the info.


Have u configured software raid on linux as i have gone thru some articles which suggests that it supports hot swapping ,as currently due to budget constraints we can't opt for hw raid.

Another question ,is the .boot partition only possible in raid 1 and not in raid 5.
Else does hw raid support /boot to be a part of raid in raid 5.