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Re: Increasing Space in Software Raid

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 redhat com
[mailto:redhat-list-bounces redhat com] On Behalf Of
culkinj3 scranton edu
Sent: Tuesday, January 29, 2008 9:38 PM
To: redhat-list redhat com
Subject: Increasing Space in Software Raid


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 Scranton edu	The University of Scranton
Phone: (570) 941-7665

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