Increasing Space in Software Raid

[John J. Culkin]

Thanks for the replys

Isn't it a little more complicated then that. I would have to make 
partitions on the new device and then I would have to expand then later

Let me see if I can get a little Betty Crocker recipe here so that we 
are all on the same page

#Fail on device
mdadm --fail /dev/sda1
#Remove the failed drive and then replace it with a larger disk
# mount the disk and format it (would I need a restart in there?)
# Here is where it gets a little tricky for me
# I think I need to make matching partitions on the larger device so 
that I can bring it into the RAIDs (one for /boot, one for / root)
#once that is rebuild I will break the raid again so that I can remove 
the remaining smaller disk
#I will then insert the new disk and mout and formate it
# before I bring the new disk into the raid I will want to grow the size 
of the / root raid - this will also mean that I will have to grow its 
partition - any tips on that?

Am I missing anything?

-- John C.

Broekman, Maarten wrote:
> The easiest way would be to break the mirror. Replace the non-live
> device with the new drive.  Make a new metadevice with the new device.
> Copy the data.  Remove the last old device and put in the second new
> device.  Then re-mirror.
>
> To make life easier you might want to use LVM also rather than raw
> metadevices on the new devices.
>
> Maarten Broekman
>
> -----Original Message-----
> From: redhat-list-bounces at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of
> culkinj3 at scranton.edu
> Sent: Tuesday, January 29, 2008 9:38 PM
> To: redhat-list at redhat.com
> Subject: Increasing Space in Software Raid
>
> 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.
>
>   

-- 
John J. Culkin			Systems Administrator
John.Culkin at Scranton.edu	The University of Scranton
Phone: (570) 941-7665