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Date: Tue, 3 Oct 2006 18:22:16 +0200
From: Jeremie Le Hen <jeremie@le-hen.org>
To: freebsd-geom@FreeBSD.org
Message-ID: <20061003162216.GB1594@obiwan.tataz.chchile.org>
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Cc: jeremie@le-hen.org
Subject: Weird thing with gmirror
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Hi,

(Please Cc: me in your replies, I am not subscribed.)

I am using:
% obiwan:tataz$ uname -mv
% FreeBSD 6.1-STABLE #8: Sun Jun 25 18:27:14 CEST 2006     root@obiwan:/usr/obj/usr/src/sys/OBIWAN  i386

I have set up a mirror gm1 using gmirror(8), with ad1 and ad2 as providers.
This had worked pretty well for weeks, until I got the following error:

% ad1: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=6170832
% GEOM_MIRROR: Request failed (error=5). ad1[READ(offset=3159465984, length=65536)]
% GEOM_MIRROR: Device gm1: provider ad1 disconnected.

Obviously, my hard drive (Maxtor's drives really, really suck) is going
sick.  But as usual, a mere reboot seems to improves the disk state, for
a while at least.


I have rebooted the box, but now the kernel says:

% GEOM_MIRROR: Device gm1 created (id=1340871616).
% GEOM_MIRROR: Device gm1: provider ad1 detected.
% GEOM_MIRROR: Device gm1: provider ad2 detected.
% GEOM_MIRROR: Component ad1 (device gm1) broken, skipping.

And gmirror(8)'s output is:

% Geom name: gm1
% State: DEGRADED
% Components: 2
% Balance: split
% Slice: 4096
% Flags: NONE
% GenID: 1
% SyncID: 1
% ID: 1340871616
% Providers:
% 1. Name: mirror/gm1
%    Mediasize: 81964301824 (76G)
%    Sectorsize: 512
%    Mode: r1w1e2
% Consumers:
% 1. Name: ad2
%    Mediasize: 81964302336 (76G)
%    Sectorsize: 512
%    Mode: r1w1e1
%    State: ACTIVE
%    Priority: 0
%    Flags: NONE
%    GenID: 1
%    SyncID: 1
%    ID: 1733588705

What am I suppose to do from here ?

I've performed the following commands:

% obiwan:root# gmirror forget gm1 ad1
% obiwan:root# gmirror insert gm1 ad1

But the whole disk is then wholly resynchronized.  Is there any faster
way to reconnecte ad1 to gm1 ?

Thank you !
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >