Re: raid1 error handling and faulty drives

2008-02-26 Thread Philip Molter
Neil Brown wrote: I've recently become aware that we really need FAILFAST - possibly for all IO from RAID1/5. Modern drives don't need any retry at the OS level - if the retry in the firmware cannot get the data, nothing will. Thanks. I agree that we do need something along these lines. It

Re: raid1 error handling and faulty drives

2007-09-07 Thread Mike Accetta
Neil Brown writes: On Wednesday September 5, [EMAIL PROTECTED] wrote: ... 2) It adds a threshold on the level of recent error acivity which is acceptable in a given interval, all configured through /sys. If a mirror has generated more errors in this interval than the threshold,

Re: raid1 error handling and faulty drives

2007-09-05 Thread Neil Brown
On Wednesday September 5, [EMAIL PROTECTED] wrote: I've been looking at ways to minimize the impact of a faulty drive in a raid1 array. Our major problem is that a faulty drive can absorb lots of wall clock time in error recovery within the device driver (SATA libata error handler in this