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Resizing GFS

In order to resize GFS some requirements need to be meat.


The new or resized partitions need to be seen at any node. This can eigher be done via a SCSI/FC-Rescan script (HP: hp_rescan) or if an existing partition has been resized with sfdisk -R. Be sure that any node in the cluster sees the same partitions with the same sizes.


If LVM is used be sure the clusterlocking is enabled. Check /etc/lvm/lvm.conf for locking_type=3 or locking_type=2. Next check if clvmd is running (/etc/init.d/clvmd status) and start if appropriate labeling new pvs then resize the volume group and then the logical volume. Check that all nodes see the same volumegroup configuration (*vgdisplay -v *).


Now if you have resized all dependencies execute *gfs_grow * on ONE node and everything should be fine.


You will only see problems if I/Os go behind the old device - that means if your filesystem access the new devices. Then unmount the filesystem on all nodes, deactivate the volumegroup (*vgchange -an ), vgscan and activate the volumegroup again (vgchange -ay volumegroup). Now you can savly remount the filesystem on all nodes.

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