Warning - this is an advanced topic. Always backup your data first. |
Preparation
Increase the size of the existing disk on both machines by EXACTLY the same size in the virtual environment.
The commands below assume that DRBD is running on /dev/sdb.
Make sure parted is current
# Update parted
yum update parted |
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Rescan the SCSI Bus to display the drive
Sometimes the system will not see the new disk immediately. To achieve this without a reboot, run the following command to rescan the SCSI bus.
# Check the size of the partition
fdisk -l /dev/sdb
# Expected output - should show the increased size of the disk in the first line
Disk /dev/sdb: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00000000
# If not, rescan SCSI and repeat above
echo 1 > /sys/block/sdb/device/rescan
# If the above command does not work, rescan SCSI busses individually
echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -" > /sys/class/scsi_host/host1/scan
echo "- - -" > /sys/class/scsi_host/host2/scan |
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Make one node Secondary
Determine which node is servicing the SMB share with pcs status, and then on the non sevicing node:
# Determine which node is servicing the share
pcs status
# Standby the server on which the resources are NOT running
pcs cluster standby acd-store2
# Run this command on the STANDBY machine
drbdadm secondary jtelshared |
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Increase Partition Size and verify - on the secondary node
# Increase partition size
# Enter "Fix" then "Fix" after entering the command below
parted /dev/sdb print
# Make sure this has worked
parted /dev/sdb print free
################################################
# DO NOT CONTINUE UNLESS THE FREE SPACE IS SHOWN
################################################
# Increase the partition size
parted /dev/sdb resizepart 1 100%
# Check
parted /dev/sdb print free |
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Increase Partition Size and verify - on the primary node
Repeat all steps above on the primary node, to increase the partition on the primary node.
Resize DRBD
On the PRIMARY node:
# Resize DRBD
drbdadm resize jtelshared |
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Check, and speed up sync
# Make sure sync is happening
cat /proc/drbd
# Speed up sync
drbdadm disk-options --c-plan-ahead=0 --resync-rate=110M jtelshared |
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When sync finished, resize the file system
This assumes, the DRBD was created with XFS, and is mounted at /dev/drbd1
# Grow file system
xfs_growfs /dev/drbd1 |
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Check the Results
Untune sync and make secondary primary again
# Untune sync
drbdadm adjust jtelshared
# Make secondary primary again
drbdadm primary jtelshared
# Unstandby the server on which the resources are NOT running in the PCS cluster
pcs cluster unstandby acd-store2
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