Re: [Bug-tar] Issue with GNU Tar and HP-UX LVM v2.2 filesystems

[Michael White]

Hi Nathan,

Thanks for the reply.  Yes, it should have said "directory".
You're going to have help me out a bit as I don't understand what you're asking 
for re. "stat <path-to-volume>/cghbck".
I do not see a OS stat command, there is a programmable stat (5) but I'm not a 
programmer that would know how to use it.
Are you asking for the path to the disk or the VG ID?
The path to the disk in both LVM v1 & v2 is the same LUN H/W Path 
64000/0xfa00/0x22
I think the VG ID you're looking for and it is quite different.

LVM 1:
# cat /cghbck/disk35.map
VGID 792e94cf50649f50

LVM 2.2:
# cat /cghbck/disk35.map2
MAPFILE02
VGID A0000000000000017Fri Sep 28 02:40:28 
2012792e94cf-f555-11dd-b66b-e1cbc018d4fd

I obtained this info by vgexport to a map file.  I know for LVM 1 the VG ID hex 
first 8 = machine ID (uname -i) and the 2nd 8 hex is time stamp.  For LVM 2 I 
do not know the format, still researching.
I did fine this info that may be helpful.
In volume groups version 1.0, LVM metadata is required to fit into a single 
physical extent. In volume
groups version 2.0 and higher, metadata is not restricted to an extent.

So I'm assuming GNU Tar doesn't know how to handle the HP-UX LVM 2.2 metadata 
since it is not restricted to a single extent.  Would that be a fair assumption?


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Nathan Stratton 
Treadway
Sent: Thursday, September 27, 2012 4:49 PM
To: address@hidden
Subject: Re: [Bug-tar] Issue with GNU Tar and HP-UX LVM v2.2 filesystems

On Thu, Sep 27, 2012 at 20:05:38 +0000, Michael White wrote:
> I got the tar-snapshot-edit utility and it calls out this file system.
>
> Director: /cghbck
>                 Dev value too high: "18446744071562076161" >
> 4294967295

(I assume this is a cut-and-paste error and the actual output said
"Directory:")

> From some old posts it appears this may be due to LVM issues so I ran
> a test and for HP-UX LVM version 1 type volume group the incremental
> works as advertised.  But when I create a HP-UX LVM 2.2 version volume
> group I get the above error.

I don't know anything about HP-UX LVM devices specifically, but it might 
provide some useful information to know what "stat <path-to-volume>/cghbck"
reports (for both LVM type 1 and type 2.2 volumes).

                                                        Nathan

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