At 7:00AM on Friday, December 14th, file systems served by the UFS-11-a and UFS-11-b filers will be unavailable while fault tolerance is restored. Restoration is estimated to take half an hour.
At 7:00AM on Thursday, December 13th, file-systems on ufs-12-a will be unavailable while server redundancy is restored. Restoration is estimated to take approximately 30 minutes.
On Friday, December 7th, we encountered an issue with the ufs-12-a and ufs-12-b filers that affected their availability between 2:30PM and 4:00PM. This issue has been resolved.
See more here