Hi All,
We have two AWs with mirrored concatenated drives.
I got curious yesterday and ran "dft show_status" & was amazed and
embarrassed to find one of the AWs had been un-mirrored for quite some time.
I read HH745 and HH835, the entire section on mirrored drives in the
Foxboro System Admin Guide (BO193ND rev F), and was still a bit mystified.
I then went to the Sun documentation web site at docs.sun.com and found a
few manuals on the DiskSuite software. I'm not sure what version of
DiskSuite we have but the manual for 4.0 looked pretty good. The main thing
I was looking for was an explanation of "Needs Maintenance", and I found the
following:
************************************************************
"Okay" - The component is operating properly.
"Resyncing" - The component is actively being resync'ed.
"Maintenance" - The component has encountered an I/O error or an open error.
All reads and writes to and from this component have been discontinued. See
"Replacing and Enabling Submirror Components" on page 96 for information on
component replacement.
"Last Erred" - The component has encountered an I/O error or an open error,
however, the data is not replicated elsewhere due to another component
failure. I/O is still performed on the component. If I/O errors result, the
mirror I/O will fail. See "Replacing and Enabling Submirror Components" on
page 96 for information on component replacement.
************************************************************
The entire manual can be viewed online or apparently downloaded as a pdf
file and is chock-full of information.
On our AW "metastat -t" showed one submirror needing maintenance on each
metamirror, and I tracked the date down to a day when we did a dump 0 on the
AW.
I used the procedure in HH835 to metadetach each "Nds_Maint" submirror
from its metamirror, and then metattach it back. The entire procedure took
about 45 minutes because I waited until each submirror was resynced before
doing the next one.
Everything seemed to go well and the different status checks ("dft
show_status", "metastat -t", "metadb -i") indicate everything is mirrored
and okay.
I guess mirroring will be added to my list of "gotchas" to monitor from
now on!
Thanks for tipping me off to a problem I had,
Steve Murray
Asarco
-----Original Message-----
From: Warren Brown [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 03, 2001 11:16 AM
To: [EMAIL PROTECTED]
Subject: Re: AW: AW: Problems with concatenated and mirrored disks on
AW51B
I am surprised that Foxboro support did not tell you to do
a dft replace_sys ESPx SCSI3
this is a front end command to the metareplace command that is
mentioned in the output.
wb
>From: "Weiss, Andreas" <[EMAIL PROTECTED]>
>
>Thanks a lot!!!
>
>E5511U# metastat d0
>d0: Mirror
> Submirror 0: d10
> State: Needs maintenance
> Pass: 1
> Read option: roundrobin (default)
> Write option: parallel (default)
> Size: 76000 blocks
>
>d10: Submirror of d0
> State: Needs maintenance
> Invoke: after replacing "Maintenance" components:
> metareplace d0 c0t3d0s0 <new device>
> Size: 76000 blocks
> Stripe 0:
> Device Start Block Dbase State Hot Spare
> c0t3d0s0 0 No Last Erred
>
>
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