Re: getting the changed objects to a cloud partition

Hi Wim,

I think this is a nice approach when changes are not that big. You could also use Gavi’s approach, but let me suggest to avoid compression on the virtual tape, compress the image catalog once you finish your backup using ZSTD or PIGZ, omit the SAV part, because you don’t need to create a SAVF from an Image Catalog to transfer to a different system, increase the TCP Send and Receive buffers to 1MB or 2MB and use FTP to transfer the IMAGEXX.zst from IFS on System A to System B


Diego E. Kesselman

El 17 jul 2023, a las 9:37, Wim Jongman via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> escribió:

Ok, this is what I did in the end.

Scenario:

Did a complete restore from SYS A to SYS B
Started conversion to 7.5 on SYS B
Kept on working on SYS A

The question was how to synchronize A to B for the changes that happened in the mean time.

The solution I used was the following:

* Do a DSPOBJD of all objects in an outfile.
* Find all the objects that changed after date X
* Collected all the libraries that needed to be synced
* Used SAVRSTCHG for each library to sync the changes (with print output)
* Transferred the printed output of all jobs to a file
* Used some regex scanning for issues
* Fixed the issues that arose

* For the IFS I used SAVRST for the directories that we change. E.g. /home

In the end, it could all be handled by the object connect function and some elbow grease:

https://www.ibm.com/docs/en/i/7.4?topic=system-objectconnect-function

Cheers, Wim

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Gavin Inman
Sent: Wednesday, June 28, 2023 1:46 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: getting the changed objects to a cloud partition

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Yes, that would work, however, the image catalog object is not compressed.

To save FTP time, after you save the objects to the Virtual Tape, save the virtual tape file to a standard *SAVF with compression Medium. We have found Medium is the best bang for the time spent compressing and we have seen as good as 70% compression rates.

Example - if you have a virtual catalog as created below:

|CRTIMGCLG IMGCLG(MYCATALOG) DIR('/MYCATALOGDIRECTORY') CRTDIR(*YES)
ADDVRTVOL(1) PREFIX(ABC) IMGSIZ(100000) TEXT(catalog-description) TYPE(*TAP)|


CRTSAVF QGPL/MYCATALOG TEXT('MY COMPRESSED SAVE')

SAV DEV('/QSYS.LIB/QGPL.LIB/MYCATALOG.FILE')
OBJ('/MYCATALOGDIRECTORY/ABC01') DTACPR(*MEDIUM)

(FTP QGPL/MYCATALOG to the new system)
(Un-compress)

RST ('QSYS.LIB/QGPL.LIB/MYCATALOG.FILE) OBJ('/MYCATALOGDIRECTORY/ABC01')

Gavin.

On 6/16/2023 1:35 PM, Wim Jongman via MIDRANGE-L wrote:

Hi,

Two weeks ago, we did a complete system save and restore on our new cloud partition. The thing is configure and now I want to get the changed objects there.

Since I have no tape device there, I was thinking of creating a virtual tape as described herehttps://www.ibm.com/docs/en/i/7.3?topic=media-virtual-tape

Then do a savchgobj *allusr to that tape, get the image catalog to the other machine, and restore the objects.

Is this the correct workflow?

Cheers, Wim


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