raid device problem

bharatlalgupta · 03-16-2009, 08:00 AM

hello
i'm newer for linux,
i used RHEL4.0 in this redhat version i created multiple raid device at a time such as raid0 raid1 raid5 on /dev/md0 /dev/md1 /dev/md2 means many raid md devices availabel.
but now in RHEL5.0 with kernel-2.6.18-8.el5 i create only one raid device any one such as raid0 raid1 raid5,means only one md device availabel in /dev directory the device address is /dev/md0
but now i want more raid (md) device on my RHEL5.0
so plz tell me how it is possible...
as soon as possible

Quote:

Quote:

NOTE:- i'm asking about after installation implementatin of many raid on one working PC....

my kernel version is kernel-2.6.18-8.el5

SORRY, fo my bad english....

anaspk · 03-17-2009, 02:05 AM

Quote:

Originally Posted by bharatlalgupta

hello
i'm newer for linux,
i used RHEL4.0 in this redhat version i created multiple raid device at a time such as raid0 raid1 raid5 on /dev/md0 /dev/md1 /dev/md2 means many raid md devices availabel.
but now in RHEL5.0 with kernel-2.6.18-8.el5 i create only one raid device any one such as raid0 raid1 raid5,means only one md device availabel in /dev directory the device address is /dev/md0
but now i want more raid (md) device on my RHEL5.0
so plz tell me how it is possible...
as soon as possible

SORRY, fo my bad english....

You have to understand what is RAID 1 2 5 and why u need all in one is there any use. You also dont mention about soft/hard RAID any way i am giving a link to look threw

http://www.linuxtopia.org/online_boo...id-config.html

bharatlalgupta · 03-17-2009, 02:54 AM

hello
your link is work on installation time (raid implimentation)
but i'm asking about after installation of redhat5.0 when i run this follow ing command..
#mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hdc{6,7}
now array created on md0 device, but now i want add more raid md device
such as
#mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/hdc{8,9,10}
now giving one error
md1 device is not availabel
but this problem was not with RHEL4.0
in RHEL5.0 only one md0 device is availabel
NOTE:- I'm using soft raid with kernel-2.6.18-8.el5

chrism01 · 03-17-2009, 04:22 AM

Have read this : http://www.linuxtopia.org/online_boo...id-config.html
Also, its not clear whether you are trying to extend md0 or add a new raid device, in which case it should be md1, not md0.