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passphrase

I'm using dm-crypt based transparent disk encryption subsystem in Linux. The cryptsetup command is used deal with the Linux Unified Key Setup (LUKS) on-disk format and mount the partition. My setup includes RAID-10 with an LVM physical volume. How do I run fsck ("file system check") on dm-crypt / LUKS based LVM physical volume under Linux operating systems?
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OpenSSH Change a Passphrase With ssh-keygen command

How do I change OpenSSH passphrase for one of my private keys under Linux, OpenBSD, FreeBSD, Apple OS X or Unix like operating systems?
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