Why everyone should be using ZFS
By user12625760 on May 26, 2009
It is at times like these that I'm glad I use ZFS at home.
pool: tank state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-9P scrub: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 mirror ONLINE 0 0 0 c20t0d0s7 ONLINE 6 0 4 c21t0d0s7 ONLINE 0 0 0 mirror ONLINE 0 0 0 c21t1d0 ONLINE 0 0 0 c20t1d0 ONLINE 0 0 0 errors: No known data errors : pearson FSS 14 $;
The drive with the errors was also throwing up errors that iostat could report and from it's performance was trying heroicially to give me back data. However it had failed. It's performance was terrible and then it failed to give the right data on 4 occasions. Anyother file system would, if that was user data, just had deliviered it to the user without warning. That bad data could then propergate from there on, probably into my backups. There is certainly no good that could come from that. However ZFS detected and corrected the errors.
Now I have offlined the disk the performance of the system is better but I have no redundancy until the new disk I have just ordered arriaves. Now time to check out Seagate's warranty return system.