On Thu, Jan 21, 2016 at 9:27 AM, Lamar Owen <lowen at pari.edu> wrote: > On 01/20/2016 01:43 PM, Chris Murphy wrote: >> >> On Wed, Jan 20, 2016, 7:17 AM Lamar Owen <lowen at pari.edu> wrote: >> >>> The standard Unix way of refreshing the disk contents is with badblocks' >>> non-destructive read-write test (badblocks -n or as the -cc option to >>> e2fsck, for ext2/3/4 filesystems). >> >> >> This isn't applicable to RAID, which is what this thread is about. For >> RAID, use scrub, that's what is for. > > > The badblocks read/write verification would need to be done on the RAID > member devices, not the aggregate md device, for member device level remap. > It might need to be done with the md offline, not sure. Scrub? There is a > scrub command (and package) in CentOS, but it's meant for secure data > erasure, and is not a non-destructive thing. Ah, you're talking about what > md will do if 'check' or 'repair' is written to the appropriate location in > the sysfs for the md in question. (This info is in the md(4) man page). Correct. -- Chris Murphy