Increasing Space in Software Raid

[nilesh vaghela]

Hi,

can use

Grow   Grow (or shrink) an array, or otherwise reshape it in some way.
 Currently supported  growth  options  including  changing  the
              active size of component devices in RAID level 1/4/5/6
and changing the number of active devices in RAID1.

Try to add two hdd with grow , once if you feel everything ok just
remove the old partition with mdadm.


Or manual method.
create /dev/mdN

with your new two hdd and boot with rescue mode and try something like
tar , dump etc to copy all the data to new raid device.
Change your mounting device in fstab and grub.
Reboot and check.

Thanx



On Jan 30, 2008 8:07 AM,  <culkinj3 at scranton.edu> wrote:
> Hello
>
> I have a server running RHEL 4 and it has a software Raid (1) of 2 250
> gb Sata disks. I want to upgrade this to two 750 gb disks in a Raid 1
> configuration. There is not another SATA slot available.
>
> Here is some more information
>
> # df -ah
> /dev/md1              229G  196G   21G  91% /
> none                     0     0     0   -  /proc
> none                     0     0     0   -  /sys
> none                     0     0     0   -  /dev/pts
> usbfs                    0     0     0   -  /proc/bus/usb
> /dev/md0               99M   11M   83M  12% /boot
> none                  505M     0  505M   0% /dev/shm
> none                     0     0     0   -  /proc/sys/fs/binfmt_misc
> automount(pid2042)       0     0     0   -  /var/autofs/bacula
> /dev/sdc1             451G  340G   88G  80% /mnt/usb
> #
> cat /proc/mdstat
> Personalities : [raid1]
> md1 : active raid1 sda3[0]
>       242983040 blocks [2/1] [U_]
>
> md0 : active raid1 sda1[0]
>       104320 blocks [2/1] [U_]
>
> unused devices: <none>
>
>
> # cat /etc/fstab
> /dev/md1                /                       ext3    defaults        1 1
> /dev/md0                /boot                   ext3    defaults        1 2
> none                    /dev/pts                devpts  gid=5,mode=620  0 0
> none                    /dev/shm                tmpfs   defaults        0 0
> none                    /proc                   proc    defaults        0 0
> none                    /sys                    sysfs   defaults        0 0
> LABEL=SWAP-sdb2         swap                    swap    defaults        0 0
> LABEL=SWAP-sda2         swap                    swap    defaults        0 0
> /dev/sdc1               /mnt/usb                ext3    defaults        0 0
>
>
> Any suggestions/tips?
>
> -- John C.
>
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-- 
Nilesh Vaghela
ElectroMech
Redhat Channel Partner and Training Partner
74, Nalanda Complex, Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info