Actually if you have a decent tape drive, using virtual tape may SLOW down the save. Unless you have your image catalogs on different disk arms, etc.
Using a DD2500 VTL.
Full system save using BRMS.
SYSTEM1:
% of Size in
Description Disk 1,000,000 bytes
User libraries 78.35 5929624.98
User directories 1.45 109477.48
Folders and documents .00 .94
QSYS .07 5293.17
Other IBM libraries .75 56549.56
Licensed Internal Code .52 39087.72
Temporary space 3.75 283452.15
Unused space 14.87 1125228.38
System internal objects .28 20979.37
Objects not in a library .00 .00
TOTAL 100.04 7569693.75
Four hours 27 minutes
SYSTEM2:
% of Size in
Description Disk 1,000,000 bytes
User libraries 2.81 132094.79
User directories 79.64 3741403.98
Folders and documents .00 .11
QSYS .05 2480.81
Other IBM libraries .44 20723.65
Licensed Internal Code .18 8241.15
Temporary space .73 34170.61
Unused space 16.12 757352.04
System internal objects .02 780.66
Objects not in a library .00 .00
TOTAL 99.99 4697247.80
Three hours 17 minutes.
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Justin Taylor
Sent: Monday, March 4, 2019 1:14 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Full save to virtual tape?
IBM i virtual tape
https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/rzam4/rzam4virtualtape.htm
It looks like a full save doesn't do SAVSTG, so we should be good.
We'd immediately DUPTAP to a physical tape. The use of virtual tape would be to shorten the system downtime. The question remains whether the time gain would be significant enough to bother.
Thanks
-----Original Message-----
From: Rob Berendt [mailto:rob@xxxxxxxxx]
Sent: Monday, March 04, 2019 8:54 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Full save to virtual tape?
I assume by "virtual tape" you are not talking about a VTL, or Virtual Tape Library. But, instead you are talking about CRTDEVTAP DEVD(TAPVRT01) RSRCNAME(*VRT) ASSIGN(*YES)
With VTL, I do it all the time. With the TAPVRT01 thing, I've not tried a full system save.
I assume you know the downfall of this thing, like, how would you restore from that, etc. And you plan on FTPing that to another system and doing a DUPTAP to other tape. Like before we had VTL and we wanted to do a remote save, FTP it over to another system and do a DUPMEDBRM there. Yes, BRMS recognizes these virtual tapes, and plays well with them. We normally used them for less than full system saves though.
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