On 08/04/2009 01:27 PM, mcclnx mcc wrote: ... > 1. is this disk really "degrade" or not? Disks aren't in degraded mode. The RAID system will run in degraded mode when the disk eventually fails. > > 2. how O.S. can predicate disk going to failure? The disk's SMART feature tells it so. > > 3. do I need replace this disk now? That would be a good idea, the disk could fail in 5 minutes or in 5 month, you can't tell. Mogens -- Mogens Kjaer, Carlsberg A/S, Computer Department Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark Phone: +45 33 27 53 25, Mobile: +45 22 12 53 25 Email: mk at crc.dk Homepage: http://www.crc.dk