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I had a 20TB LUN in one of my systems named maptha. I created two 10TB partitions out of it, mapathap1 and mpathap2.

When I ran the command

mkfs.ext3 /dev/mapper/mpathap1

another completely different and non-related system IO got slow so I had to stop formatting immediately because the second system was really important. Is the partition damaged? How may I find out if it is damaged or I can rely on it?

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    It's probably not damaged, but since the filesystem was not allowed to be created properly it's probably unusable until you let mkfs run to completion. – Kusalananda Oct 27 '18 at 10:03
  • is there any command, log or utility that i can use to check partition or lun status? or run a test? – BlackCrystal Oct 27 '18 at 10:06
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    Utilities that deal with file systems should have no reason to write to the partition table. Nor they write outside the partition you specify when you invoke them. Your partition should be safe, and commands like sudo fdisk -l /dev/mapper/mpathap1 or sudo parted /dev/mapper/mpathap1 print should tell you if something is not ok. – fra-san Oct 27 '18 at 10:23
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Does your device support S.M.A.R.T.? If so, you can take a look if there were any errors at hardware level (this may not be partition-specific). As was pointed out above, terminating the process of filesystem creation should not cause any damage, and you can restart it. Once mkfs finishes, you can check the available filesystem with e2fsck.

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