FAILED SMART self-check

[Robert Canary]

As I said I *removed* the drive in the sda location.
I then put the mirrored drive (on sdb) in its place (into sda).   Now sdb is running in the sda slot.
I appreciate the suggestion, however, I do understand how RAID 1 works I understand what RAID 1 is.
Yes I do have messages that sdb is missing.  I can disregard those messages for the moment.  However, since it is RAID 1 at the bios level, thats probally why I'm not seeing tons of message about it missing.

My concern is I am still getting the same error.  for the device at sda.  However, it is a different device was.  I have never seen RAID 1 transfer bad sector to the mirrored drive. I don't even think that is possible since we are talking about a physical defect.  . . . . .  aren't we?

Robert Canary
OCDirect Electrical-Datacomm
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----- Original Message -----
> Robert Canary wrote:
> > Sorry for the confusion.
> >
> > Two drives sda and sdb are mirrored with RAID 1
> > Getting errors on sda.
> > I removed the sda, and moved sdb into the sda position
> >
> > However, I am still getting the same errors on the sda.
> >
> First, but based on what you've written, you really need to read up
> on
> what RAID 1 *is*.
> 
> Second, when you say you removed /dev/sda, did you take it out of the
> box,
> or just swap positions? If the latter, then a) the system still sees
> it as
> sda: that's not something you've made any changed to - the system
> will
> look for a LABEL or UUID, b) if you did take it out, and replace it
> with
> another, new, physical drive, then there will be RAID messages saying
> it's
> rebuilding, and c) if you just took it out, and there's only the one
> drive, the former /dev/sdb, you will be seeing tons of messages that
> RAID
> is degraded.
> 
>       mark
> 
> >
> > ----- Original Message -----
> >> On 07/25/12 07:18, Robert Canary wrote:
> >> > I have RHEL machine here that becomes so unresponsive the mail
> >> > server
> >> > it is hosting practically stops. It is currently running a
> >> > mirrored
> >> > drive between sda and sdb. I have been getting the following
> >> > errors
> >> > in the log files, so I moved the mirrored drive to sda and
> >> > disabled
> >> > the (old) sda. Currently the system seems to be stable again,
> >> > however, I am still getting these errors.
> >>
> >> I'm sorry, but I don't understand what you did. You mention two
> >> drives,
> >> and then "the (old) sda". ?
> >>
> >> Next, is this RAID 1?
> >> >
> >> > Any ideas where to go to fix it. Could it be bad sectors where
> >> > transferred to the mirrored drive? Running smartmontools-5.3 I
> >>
> >> No. Bad sectors are *physical* errors on the platter.
> >> <snip>
> >> 	mark
> >>
> >> --
> >>   When was the pleistocene?
> >>   Around 1.8 million years ago, til about 10K years ago.
> >>   What era are we in now?
> >>   Trouble.
> >>
> >> --
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