Nasty CRC backup restore failure.Probably cPanel needs a feature to prevent this.

Hi everyone,

yesterday I needed to restore an account from a daily legacy backup, on a server which had "use pigz" option enabled during backup and during restore.

I terminated the account and ran legacy backup restore from WHM. And to my surprise, restoration failed with tar CRC error message. Tried again, failed again: unable to unpack archive. CRC error mesage. HDD had enough space.

I successfully restored the same account on the same box many times before, restoration never failed in past.

To test tar.gz archive in question, I copied it to a Windows machine, unpacked it with WinRar -- no errors found.
Then tested the archive on the server via shell by unpacking it with gunzip to dev/null - no errors found.

How is this possible? Is this preventable? Can we have a feature in cPanel that checks created .tar.gz archives after backup complete for integrity (for CRC errors)?

Also, some archive software, for example, WiinRar have a "recovery record" feature, description from Wikipedia:

they can add extra bytes to archive to improve its "durability". Can we have a feature in cPanel that creates backup archives with extra recovery record?

 

Michael, already restored site from an earlier backup and deleted the archive in question, my fault. I'll open a ticket if this happens again. Sorry for the rant