topic Re: Internal Disk was configured as RAID 0 in Operating System - Linux

Internal Disk was configured as RAID 0

Md. Minhaz Khan — Wed, 04 Aug 2010 11:01:12 GMT

Dear All,

We have two (HP DL380 G5) Servers. In both servers we have installed RHEL 5.4. But when we run â ./hwraidinfoâ & â hwraidstatusâ commands it shows that internal disk was configured as RAID 0. Please check the attached output with this thread. Please verify & confirm me whether or not is there any possibility of complete data lost if one of the disk faulty

hwraidinfo:
XXXXXXXXXXX

#!/bin/sh
SLOTLIST=$(hpacucli ctrl all show | \
grep Slot | sed -e 's/^.*Slot //g' -e 's/ .*$//g')

for i in $SLOTLIST
do
echo
hpacucli ctrl slot=$i show | grep -v "^$"
echo
hpacucli ctrl slot=$i ld all show | grep -v "^$"
hpacucli ctrl slot=$i pd all show | grep -v "^$"
done
echo

hwraidstatus:
XXXXXXXXXXXXX

#!/bin/sh
SLOTLIST=$(hpacucli ctrl all show | \
grep Slot | sed -e 's/^.*Slot //g' -e 's/ .*$//g')

for i in $SLOTLIST
do
echo
hpacucli ctrl slot=$i show status | grep -v "^$"
echo
hpacucli ctrl slot=$i ld all show status | grep -v "^$"
hpacucli ctrl slot=$i pd all show status | grep -v "^$"
done
echo

Re: Internal Disk was configured as RAID 0

AnthonySN — Wed, 04 Aug 2010 11:15:59 GMT

with RAID 0 there is a always a loss with any disk failure.

you have 2 logical drives with raid 0.
why dont you recreate one logical drive with raid 1 with striping and install the OS on it

Re: Internal Disk was configured as RAID 0

Md. Minhaz Khan — Wed, 04 Aug 2010 11:26:29 GMT

Thanks SASJ. You are right but from system i have only see 146 GB Disk. But from the "hpacucli" command output i have found two logical drive. I am confused. Can any one explain me is actually Each 146GB SAS disk was configured as RAID 0 or they are configured as RAID 1+0 ??

Note: Please check the attachment for more details

Thanks
Minhaz

Re: Internal Disk was configured as RAID 0

AnthonySN — Wed, 04 Aug 2010 12:00:53 GMT

from your attachment

Disk /dev/cciss/c0d0: 146.7 GB, 146778685440 bytes
Disk /dev/cciss/c0d1: 146.7 GB, 146778685440 bytes

there we can see two disks.

Re: Internal Disk was configured as RAID 0

AnthonySN — Wed, 04 Aug 2010 12:02:08 GMT

you need to format the other
Disk /dev/cciss/c0d1: 146.7 GB, 146778685440 bytes

Re: Internal Disk was configured as RAID 0

Md. Minhaz Khan — Wed, 04 Aug 2010 12:28:00 GMT

Dear SASJ

Thanks a lot to guide me. Can you help me how can i mirror disk /dev/cciss/c0d0 with Disk
/dev/cciss/c0d1 (May be soft RAID)

But Disk /dev/cciss/c0d1 is already RAID 0. This RAID is configured with P400 HP Smart controller.We cannot format the disk because this server is now in Production.

Thanks
Minhaz

Re: Internal Disk was configured as RAID 0

AnthonySN — Wed, 04 Aug 2010 13:40:25 GMT

the other disk is a logical drive and just like any other disk,
you can very well format it.
you can use use fdisk -m dev/cciss/c0d1
and yes you can do a software mirror.

the best thing was to create a raid 1+0 initially before installing the OS.
even now if the server is new you should consider doing a HW raid 1+0 and install OS again

Re: Internal Disk was configured as RAID 0

AnthonySN — Wed, 04 Aug 2010 13:46:48 GMT

how to configure software raid
http://web.mit.edu/rhel-doc/5/RHEL-5-manual/Deployment_Guide-en-US/s1-raid-config.html

Re: Internal Disk was configured as RAID 0

Md. Minhaz Khan — Thu, 12 Aug 2010 09:44:25 GMT

Thanks a lot