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Re: Increasing Space in Software Raid



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 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
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