I see two kinds of ECKD DASD in what you're describing: disk with one
partition used as a filesystem, and disk with one partition used as a
"PV" to LVM.
Assuming CDL ("compatible" disk layout) you probably have the device
number prefixed with "0X" as the volser. If you simply DDR from virtual
to physical, you may have duplicates in the complex.
Alternatives to mounting by device number include mounting by Linux
filesystem label or mounting by Linux filesystem UUID. You'll likely
have duplicates with Linux FS labels too, but you almost certainly will
*not* get duplicate UUIDs.
LVM *always* recognizes PVs by UUID and a PV cannot be mounted as a
filesystem. (You have to mount the LV on the other side of the LVM
magic.) The UUID of a filesystem on LV is completely independent of the
UUID of any PVs which provide its backing store.
On 11/17/2015 03:38 PM, Ray Mansell wrote:
> Thank you Mark, and Alan, and Gregory...
>
> I think our problem is going to be more one of boredom rather than
> encountering insurmountable problems, as DDR plods its way through
> several hundred volumes. Originally I thought we were going to have to
> cope with changing device numbers on the new system, which I believe
> would have posed a much more interesting problem, but I think I've
> managed to persuade the storage admin that this simply isn't practical.
> In any case, it looks as though I will have plenty to occupy my time
> between now and the new year.
>
> Thanks again,
> Ray
>
> On 11/17/2015 11:07, Mark Post wrote:
>>>>> On 11/17/2015 at 10:12 AM, Ray Mansell <[email protected]> wrote:
>>> Speaking of disk address changes... how does one cope with that? We
>>> have
>>> a new DS8700 to replace our ancient DS8000s, and I'm wondering what is
>>> the best way to migrate our LPAR Linux servers to the new box? I'm sure
>>> this must have been done before, so I'd be very interested to learn how
>>> others have managed this.
>> How you cope is going to be determined by how the file systems are
>> referenced in /etc/fstab, and whether LVM is being used or not. What
>> does your setup look like?
>>
>>
>> Mark Post
>>
>
> ----------------------------------------------------------------------
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to [email protected] with the message: INFO LINUX-390
> or visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
> ----------------------------------------------------------------------
> For more information on Linux on System z, visit
> http://wiki.linuxvm.org/
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
----------------------------------------------------------------------
For more information on Linux on System z, visit
http://wiki.linuxvm.org/
