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I figured it out. Modify the EBS volume to increase the size. Create partition, format, mount /var in the new partition and reboot. You must use partprobe command if any issue occurs (in the new partition doesn't show up) with partitioning.
answered a year ago
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Do you want a separate partition on the same /dev/xvda disk or partitions for /var and /home on separate disks (/dev/xvdb and /dev/xvdc)?
on the same /dev/xvda disk
Know that the only benefit is this will prevent one partition filling up from effecting the others. So if the /var partition is at 100% full, the root partition and /home are not effected. This was an old way of managing space when disks were expensive or difficult to expand. Having separate disks will cost a little bit more but will improve performance in addition to the resilience that you are looking for. Do you have enough space on /dev/xvda to create the partitions of a size that you want? If your disk is at less than 50% full, you can proceed. Otherwise you will need to expand /dev/xvda first.
Thanks for your response. It's more than 60% free space. Please let me know how to move /var directory into separate partition?