Preparing for transition of FC or FCoE SAN boot LUNs on RHEL hosts
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PDF of this doc site
- Copy-based transition
- Copy-free transition
Collection of separate PDF docs
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Before you transition an FC or FCoE SAN boot LUN, you must perform specific steps on your Red Hat Enterprise Linux (RHEL) host.
You must have the following information from the Inventory Assessment Workbook:
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7-Mode LUN name on which RHEL 5 or RHEL 6 is installed
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SCSI device name for the transition LUN
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DMMP device name for the transition LUN
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Mount directory
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File system configured on the DMMP device
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UUID number of the /boot partition
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Name of the
initrid
image
This procedure applies to copy-based transitions and copy-free transitions.
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Verify that the DMMP device exists in the /dev/mapper directory:
ls /dev/mapper/ DMMP_device_name
If you cannot locate the DMMP device, then it might be using an alias or user-friendly name.
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Identify the DMMP devices and Logical Volume Manager (LVM) names on which the RHEL 5 or RHEL 6 operating system /boot and root (/) directories are installed:
df - h
By default, RHEL 5 and RHEL 6 are installed on the root (/) partition on the logical volume. If the root partition is installed on the logical volume, then no pretransition changes to the configuration are required.
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If the /boot partition is installed on the DMMP device, confirm how the /boot partition is referenced to mount in
/etc/fstab
at boot time. -
If the /boot partition is referenced in
/etc/fstab
by its DMMP device name, replace the DMMP device name with the file system UUID name. -
Make a backup of the
/etc/fstab
file:cp /etc/fstab /etc/fstab_pre_transition_file_name
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Edit the
/etc/fstab
file to replace the DMMP device name with its respective file system UUID number. -
Make a backup of the
initrd
image file:cp /boot/initrd_image_file_nameinitrd_image_file_name.bak
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For RHEL 5 only:
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In the
/etc/mutipath.conf
file, identify the SWAP partition device.In the following example,
/dev/VolGroup00/LogVol01
is the SWAP partition device:/dev/VolGroup00/LogVol01 swap swap defaults 0 0
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Create a label for mounting the swap partition:
swapoff swap-partition_device
mkswap -L label-for-swapswap-partition-device
swapon swap-partition_device
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Replace the SWAP partition device name in the
/etc/fstab
file with THE SWAP label.The updated line in the
/etc/fstab
file should be as follows:LABEL=SwapPartition swap swap defaults 0 0
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Re-create the initrd image.
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For RHEL5:
mkinitrd -f/boot/ initrd-"'uname-r'".img 'uname-r' --with multipath
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For RHEL 6:
dracut --force --add multipath --verbose
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Restart the host to boot from the new
initrd
image.
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