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  3. October 2017

Re: Mount from Linux to asp02

Don, the link you posted made sense to me, it contrasts with what you
posted to the list.

In the linked document, the MOUNT happens *before* the creation of the
subdirectory /asp02/backup, which means it is created in the ASP2 tree
grafted onto the root file system by the MOUNT.

The way you described it earlier, the MOUNT happened *after* the creation
of the subdirectory /asp02/backup, which doesn't make Unix filesystem/mount
sense.

So I'm all good now :) Thanks for clarifying!

On Thu, Oct 19, 2017 at 7:33 PM, Don Brown <DBrown@xxxxxxxxxx> wrote:

I reached out to a colleague who assisted with this interpretation ...


The command
CRTDIR DIR('/asp02')
is creating a directory in SYSBAS onto which the used defined file system
(which is the IFS in ASP2) will be mounted.

The command
MOUNT TYPE(*UDFS) IFS('/dev/qasp02/qasp02.udfs') MNTOVRDIR('/asp02')



makes the IFS contents of ASP2 visible/usable by putting them inside the
/asp02 directory

The following command creates the first play directory inside asp02
CRTDIR DIR('/asp02/backup')

The IFS data in ASP2 will always be there but it isn't visible until a
mount is issued (hopefully in the startup program).




Don Brown





From: "Don Brown" <DBrown@xxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 20/10/2017 08:32 AM
Subject: Re: Mount from Linux to asp02
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Not sure Jack but it did work.

I used this link for the initial UDFS creation;
http://www-01.ibm.com/support/docview.wss?uid=nas8N1013504

If I do a wrklnk '/asp02'
then option 8=Display attributes
I can see the the object is in auxiliary pool 2 ...

Display Attributes

Object . . . . . . : /asp02

Type . . . . . . . . . . . . . . . . . : DIR

Owner . . . . . . . . . . . . . . . . : QSECOFR
System object is on . . . . . . . . . : Local
Auxiliary storage pool . . . . . . . . : 2
Object overflowed . . . . . . . . . : No

The same applies to the directory /asp02/backup

Now I did not check this before doing the MOUNT

If I get some time over the weekend I will try and test further.

Cheers


Don Brown





From: "Jack Woehr" <jwoehr@xxxxxxxxxxxxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 20/10/2017 05:07 AM
Subject: Re: Mount from Linux to asp02
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>




CRTUDFS UDFS('/dev/QASP02/qasp02.udfs')

Create the directories in ASP02

CRTDIR DIR('/asp02/')
CRTDIR DIR('/asp02/backup')

Mount the file system

MOUNT TYPE(*UDFS) MFS('/dev/qasp02/qasp02.udfs') MNTOVRDIR('/asp02')


Hmm, does this really work?!

If I did the equivalent in Unix this would:

1. Create the file system on QASP02
2. Create a mount point /asp02/ *in the root file system*
3. Create /asp02/backup below that /asp02 mountpoint *in the root file
system*
4. Mount the qasp02.udfs file system on root mountpoint /asp02 *leaving
the local subdirectory /asp02/backup in place*
- *(Actually this wouldn't work on Unix because you can't mount to a
mount point that has a subdirectory.)*

I don't quite get the magic by which /asp02/backup is created on the
mounted qasp02.udfs file system instead of in the root filesystem, if you
care to explain and enlighten me :)

On Wed, Oct 18, 2017 at 11:16 PM, Don Brown <DBrown@xxxxxxxxxx> wrote:

Update for archive.

Recently I asked a question on this group for setting up ASP02 and using
it for backups that are subsequently saved to external storage by
mounting
a NFS directory to the IFS from an Linux backup server.

This is now all working but had a few issues along the way.

This may assist someone else doing the same or similar.

We used a second ASP (2) that had been previously created.

Create the file system

CRTUDFS UDFS('/dev/QASP02/qasp02.udfs')

Create the directories in ASP02

CRTDIR DIR('/asp02/')
CRTDIR DIR('/asp02/backup')

Mount the file system

MOUNT TYPE(*UDFS) MFS('/dev/qasp02/qasp02.udfs') MNTOVRDIR('/asp02')

Note: Mount is not preserved across IPLs. Therefore, you must mount
after
every IPL. I would suggest adding the MOUNT command in the system
start-up
program.

Create the Image Catalogue, add an entry and load it.

CRTIMGCLG IMGCLG(BACKUP) DIR('/asp02/backup') TYPE(*TAP) CRTDIR(*NO)
ADDIMGCLGE IMGCLG(BACKUP) FROMFILE(*new) TOFILE(VOL001) VOLNAM(VOL001)
LODIMGCLGE IMGCLG(BACKUP) IMGCLGIDX(1) OPTION(*MOUNT)

Create a virtual tape and vary it on

CRTDEVTAP DEVD(TAPVRT01) RSRCNAME(*VRT)
VRYCFG CFGOBJ(TAPVRT01) CFGTYPE(*DEV) STATUS(*ON)
LODIMGCLG IMGCLG(BACKUP) DEV(TAPVRT01)

Save a library for a test
SAVLIB LIB(TESTLIB) DEV(TAPVRT01) CLEAR(*ALL)

Export the IFS Directory in ASP02

CHGNFSEXP OPTIONS('-I -F -O VERS=4:3:2,ROOT=192.168.126.4')
DIR('/asp02')

This is allowing NFS versions 4, 3 and 2 to be available. The default
is
versions 3 and 2 Only which is where we initially had authority
problems.

ROOT access is specified for the connection.

The above command is using the ip address but that SHOULD be replaced
with
the hostname to avoid future issues if IP addresses change. (Just ask
Rob!)

On the Linux box mount the drive

mount -t nfs 192.168.126.12:/asp02/backup testDirectory

Running the mount command without any options shows

192.168.126.12:/asp02/backup on /root/testDirectory type nfs
(rw,vers=4,addr=192.168.126.12,clientaddr=192.168.126.4)

Listing the directory contents shows the image catalogue and the saved
volume

ls /root/testDirectory

And the results show the files

QIMGCLG VOL001




Don Brown
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