Ext3 behavior on power failure
armangau_philippe at emc.com
armangau_philippe at emc.com
Wed Mar 21 17:18:10 UTC 2007
Hi all,
We are building a new system which is going to use ext3 FS. We would like to know more about the behavior of ext3 in the case of failure. But before I procede, I would like to share more information about our future system.
* Our application always does an fsync on files
* When symbolic links (more specifically fast symlink) are created, the host directory is also fsync'ed.
* Our application is also going to front an EMC disk array configured using RAID5 or RAID6.
* We will be using multipathing so that we can assume that no disk errors will be reported.
In this context , we would like to know the following for recovery after a power outage:
1. When will an fsck have to be run (not counting the scheduled fsck every N-mounts)?
2. In the case of a crash, are the fsync-ed file contents and symbolic links safe no matter what?
Thanks,
Philippe Armangau
Centera Software Group
Consultant Software Engineer
EMC² <http://www.emc.com/>
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