Date: Sat, 28 Jan 2012 17:36:15 -0500 From: Lee Dilkie <lee@dilkie.com> To: freebsd-geom <freebsd-geom@freebsd.org> Subject: gmirror question, drive missing Message-ID: <4F24785F.20607@dilkie.com>
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Hi Folks,
I'm hoping freebsd-goem is the correct place for this question.
I had a server crash that had a gmirror array of two drives. It was my
bootable disk and it failed in such a way that it wouldn't recover
without swapping cables.
So the original gmirror, gm0, had /dev/ad10 and /dev/ad11 as providers.
Now, gmirror shows.
$ gmirror status gm0
Name Status Components
mirror/gm0 DEGRADED ad10
$ gmirror list gm0
Geom name: gm0
State: DEGRADED
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 1
SyncID: 2
ID: 1837199655
Providers:
1. Name: mirror/gm0
Mediasize: 1000204885504 (931G)
Sectorsize: 512
Mode: r5w5e6
Consumers:
1. Name: ad10
Mediasize: 1000204886016 (931G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: DIRTY
GenID: 1
SyncID: 2
ID: 3835414526
no mention of /dev/ad11 at all.
however, I can dump the metadata and it's there, as far as I can tell.
$ gmirror dump /dev/ad11
Metadata on /dev/ad11:
magic: GEOM::MIRROR
version: 4
name: gm0
mid: 1837199655
did: 1856327785
all: 2
genid: 0
syncid: 2
priority: 0
slice: 4096
balance: round-robin
mediasize: 1000204885504
sectorsize: 512
syncoffset: 0
mflags: NONE
dflags: DIRTY
hcprovider:
provsize: 1000204886016
MD5 hash: 5ac5a19c7e0b99b4852ba535297d413a
and the working, ad10...
$ gmirror dump /dev/ad10
Metadata on /dev/ad10:
magic: GEOM::MIRROR
version: 4
name: gm0
mid: 1837199655
did: 3835414526
all: 2
genid: 1
syncid: 2
priority: 0
slice: 4096
balance: round-robin
mediasize: 1000204885504
sectorsize: 512
syncoffset: 0
mflags: NONE
dflags: DIRTY
hcprovider:
provsize: 1000204886016
MD5 hash: 13cc9220591eb360cbdaea72edbe87d9
so what's happened? Do I simply perform a "gmirror insert gmo /dev/ad11"
to re-setup the mirror or should something else be done?
BTW, when I performed all my failure mode tests before, I never saw a
provider disappear, gmirror simply rebuilt the array when the disk was
plugged in. And I did move disks around the sata cables so they were
both masters instead of the master/slave I had originally used with the
mirror was set up, so I don't *think* swapping the sata cables did this
but....
TIA,
-lee
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