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Linux QA: 101

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1
unable to handle kernel paging request at ffff8803980dcc70

Before, you read can you guess what above kernel message say? Above line suggests, kernel code tried to read some memory that isn’t loaded into RAM, which resulted in a page fault.

1
What does a superblock error mean?

In general, superblock errors would indicate some data corruption in the sector. It can either be due to faulty hardware or power failures.

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Do we need fragmentation for ext filesystems?

ext filesystems are pretty fragmentation resistant and defragging isn’t really needed except in few cases like transferring large files while the disk was nearly full.

1
What is the equivalent command for chkdsk in Linux world?

fsck (easy to remember ;))

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How to set immutable attribute to a file?

chattr +i filename

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Which command displays whether the file has immutable attribute or not?

lsattr

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Explain what /sbin/udevadm control --reload-rules command do?

Command reloads the rules from disk, and they will then apply to any new device that is added after that.

1
How to verify the semaphores limits?

ipcs -sul

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