Increasing Space in Software Raid
Broekman, Maarten
Maarten.Broekman at FMR.COM
Wed Jan 30 13:51:09 UTC 2008
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.
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