Journaling no protection against power drop

Posted Sep 5, 2009 0:10 UTC (Sat) by giraffedata (guest, #1954)
In reply to: Journaling no protection against power drop by ncm
Parent article: Ext3 and RAID: silent data killers?

If you provide a few seconds' battery backup for the drive but not the host, then the blocks in the buffer that the drive said were on the disk get a chance to actually get there.

But then you also get the garbage that the host writes in its death throes (e.g. update of a random sector) while the drive is still up.

To really solve the problem, you need much more sophisticated shutdown sequencing.