* erik quanstrom <[EMAIL PROTECTED]> [081015 18:23]: > > back when i had mirroring via devfs (some three years ago now) i used > > 'cmp' to verify that the disks were being correctly written to and > > that no errors have occurred. i ran cmp from the nigtly log at least > > couple of times a week. > > that's a good idea. > > when using the mirror device, no write error is issued unless all mirrored > copies are unwritable. this would make me nervous since without a > checksum, it's hard to know which copy is good. > > (/n/sources/plan9/sys/src/9/port/devfs.c:697)
Also it means that while the writes may be ok, you will find out that some sectors are corrupt at the wrong time. For this a cmp would not be sufficient would it? An interesting thing in my case is that I got cmp errors from the start, even with freshly nulled partitions and identical partitions and disks. I still cannot figure out why. Cheers, Christian
