> On 09/05/19 00:19, Roy Sigurd Karlsbakk wrote: >>> On 9/5/19 7:41 am, Roy Sigurd Karlsbakk wrote: >>>> Hi >>>> >>>> I'm monitoring this box and it seems ID 5 Reallocated Sectors Count (from SMART) >>>> is climbing frantically on one disk. It's a r6 so it shouldn't be much of an >>>> issue once the disk eventually fails, but does anyone out there know how many >>>> reallocated sectors you can have on a drive? This is an older 1TB ST31000524NS >>> >>> My rule, and what is often suggested in raid documents, is that once the number >>> start to visibly climb (you say 'frantically') I replace the disk. >> >> That's more or less my understanding of it as well. The question was more of a >> theoretical question: How many sectors can it reallocate before theey start to >> go "pending"? >> > I'm not sure of the exact meaning of "pending sectors", but I'm pretty > certain your question doesn't make sense. Sectors go "pending" BEFORE > they are re-allocated, not after. 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 > > I suspect that if a read fails, the sector goes pending. If a "write > then verify" fails, the sector is re-allocated. And if the disk runs out > of space to re-allocate, it commits suicide. > > So you can have thousands of "pendings", and it's independent of > "reallocated". But if there's a real problem (like surface damage) any > attempt to rewrite those pendings will result in a rapidly climbing > reallocated count - like you've just seen - and as others have said, it > looks like your drive is on the way out ... AFAICS "pending" means "I know htese are bad, but I haven't reallocated them (yet). Sometimes they never even get reallocated. Vennlig hilsen roy -- Roy Sigurd Karlsbakk (+47) 98013356 http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- Hið góða skaltu í stein höggva, hið illa í snjó rita.
