Submitted by Anonymous (not verified) on Thu, 07/03/2014 - 5:41pm
It may be necessary to deactivate (down) an Xsan data storage pool in a volume, but retain access to data on other storage pools within the volume. You may need to do this if there is a LUN issue in an Xsan storage pool and Xsan clients are unable to mount the Xsan volume, for example.
Submitted by Apple Knowledge Base on Fri, 05/23/2014 - 4:15pm
The horizontal and vertical scroll bars might intermittently disappear in the Event Browser and Timeline in Final Cut Pro X 10.1.x. This can occur after you pair a mouse or trackpad with your MacBook Pro (Retina, Late 2013) or Mac Pro (Late 2013).
For the sake of brevity, I've leave out the 3 months of background information trying to resolve the problems we've had.
We have a SAN that used to have 450-550 MG/s read/write speeds. It preformed this way for 4.5 years. Now it's writing and reading at much lower speeds, like 40-150 MG/s write speeds and 250-300 read speeds. YES, we've investigated all the likely things: SFPs, fibre cables, thoroughly investigated the fibre switch, checked the RAID controller, etc.
My question is simply this: Does anyone know if it's possible for a degraded/corrupted/buggy Xsan filesystem to cause such heavily reduced speeds? To our knowledge, we have never run a cvfsck on this Xsan volume and it's been in heavy use for almost 5 years. I'm going to do run this tomorrow. Could the Xsan filesystem be the cause of our degraded drive speeds?
Submitted by Apple Knowledge Base on Tue, 04/22/2014 - 1:32pm
The following is an overview of the startup sequence, error conditions, and behaviors for all Intel-based Macintosh systems.
Note that some newer Macintosh models only use tones to indicate error conditions. See this article for more information.