Date: Fri, 13 Mar 2009 19:57:39 +0200 From: Andriy Gapon <avg@freebsd.org> To: freebsd-geom@freebsd.org, freebsd-fs@freebsd.org Subject: Re: zfs: affected by geom_(mbr|bsd) => geom_part_(mbr|bsd) ? Message-ID: <49BA9E93.4060609@freebsd.org> In-Reply-To: <4922FB81.50608@icyb.net.ua> References: <4911C3E9.405@icyb.net.ua> <49198A1A.3080600@icyb.net.ua> <B6997A5A-1B56-4325-A24A-EF90AF8C6A6A@mac.com> <49227875.6090902@icyb.net.ua> <93FC5F5D-91CD-450B-B08D-5C5EC5A1C880@mac.com> <4922FB81.50608@icyb.net.ua>
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Very belated but somebody reading archives might find this useful.
Only today I discovered zdb command and its -C option:
$ zdb -C
tank
version=6
name='tank'
state=0
txg=1997530
pool_guid=15723282379537418671
hostid=714261228
hostname=''
vdev_tree
type='root'
id=0
guid=15723282379537418671
children[0]
type='disk'
id=0
guid=1732303387090405178
path='/dev/ad6s2d'
devid='ad:GEA534RF0TK35A'
whole_disk=0
metaslab_array=14
metaslab_shift=32
ashift=9
asize=493659881472
DTL=182
on 18/11/2008 19:29 Andriy Gapon said the following:
> I just remembered that I saved old zpool.cache file before "migrating"
> the pool.
> I looked at the diff of hexdumps and there are a number of differences,
> it's hard to understand them because the file is binary (actually it
> seems to contain serialized name-value pairs), but one difference is
> prominent:
> ...
> 00000260 64 65 76 69 64 00 00 00 00 00 00 09 00 00 00 01
> |devid...........|
> ...
> -00000270 00 00 00 15 61 64 3a 47 45 41 35 33 34 52 46 30
> |....ad:GEA534RF0|
> -00000280 54 4b 33 35 41 73 31 73 33 00 00 00 00 00 00 28
> |TK35As1s3......(|
> ...
> +00000270 00 00 00 11 61 64 3a 47 45 41 35 33 34 52 46 30
> |....ad:GEA534RF0|
> +00000280 54 4b 33 35 41 00 00 00 00 00 00 28 00 00 00 28
> |TK35A......(...(|
> ...
>
> It looks like old "devid" value is "ad:GEA534RF0TK35As1s3" and new one
> is "ad:GEA534RF0TK35A". Just a reminder: actual zpool device is ad6s2d.
>
> The new value is what is reported by diskinfo:
> $ diskinfo -v ad6
> ad6
> ...
> ad:GEA534RF0TK35A # Disk ident.
>
> $ diskinfo -v ad6s2
> ad6s2
> ...
> ad:GEA534RF0TK35A # Disk ident.
>
> $ diskinfo -v ad6s2d
> ad6s2d
> ...
> ad:GEA534RF0TK35A # Disk ident.
>
> Hmm, "indent" is reported to be the same for all three entities.
>
> I don't remember what diskinfo reported with pre-gpart kernel, but I
> suspect that it was something different.
> Could anybody please check this? (on 7.X machine without GEOM_PART).
>
> I quickly glimpsed through sources and it seems that this comes from
> DIOCGIDENT GEOM ioctl i.e. "GEOM::ident" attribute. It seems that
> geom_slice.c code has some special handling for that.
>
--
Andriy Gapon
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