Thank you all for your replies. This list is very creative with solutions to problems. Thanks you all again.
Tom. I reviewed the Red Book on the TS7700 and found the EXPORT feature very interesting. It sounds like it is a standalone feature and doesn't require z/OS unless you .... Need to review this in more detail. Hans -----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Tom Duerbusch Sent: June 3, 2009 1:13 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: IBM VTS in a VM/VSE environment. It can be a problem. Most smaller shops are happy just getting an IBM VTS (or any VTS) and wouldn't consider the extra cost of the full VTS system with offsite capabilities. In the newer VTS systems (TS whatever), there is an option, that is kind of neat. You can export VTS tapes, the physical tape (which is made of multiple virtual tapes) to another VTS unit. There is also a dual tape feature, in which certain virtual tapes, will be put on two physical tapes. Well, for those tapes, create a small pool of physical tapes that are used for these copies. Then export these copies (they are physically ejected from the VTS and can only be used by importing them into another VTS. This is great if your disaster recovery plans also include a newer VTS. But for the rest of us...... Produce physical tapes for offsite, by copying. Hopefully, you are encrypting the tapes to be sent offsite. Well, producing physical copies comes with its own set of problems. Your VTS was defined with a virtual tape volume size of XX GB. When the VTS virtual tape hits this size, and End of Volume signal is generated and an new virtual volume is obtained. Copying these tapes can be expensive. Let's say that the virtual tape volume size is 2 GB. You need at least a 3590 tape (any size) to hold the data. They are relatively cheap, when compare to a TS1120 tape (that has hardware encryption). 1:1 is easy at the disaster recovery site, but expensive to buy and a real pain to produce these tapes. (Operator mounts and tracking all these tapes) I stack the tapes. You can get a lot of virtual tapes on a physical tape. For most, but not all tapes (I'll get to that later).... I have another Dynam catalog DSN name, starting with a "V" (for vault), that is file X on a tape. Then I just do a TDYNCOPY of the tape DSN from the VTS to the physical tape. And I just run along with that process. Note that a DSN that was a multi volume DSN of 2 GB volumes, will be combined by TDYNCOPY to a signal volume. In most cases, this is ok. For some DSNs, you can't combine volumes that way. For example VMBACKUP, senses EOV and puts trailing information at the end of the tape, which includes the volser of the next tape that will be used. It also puts information at the front of each tape, of the volser of the previous tape, and some info on what should be on this tape. Any backup product that, for restores, allow you to bypass the first xx tapes, have something like that encoded. For these tapes, you have to do a physical tape copy (like DITTO), recording the internal VOLSER. Now, do you create physical tapes for each of these? Or do you still stack them, and unstack them if and when a disaster recovery is needed? Do you buy some older 3590 drives so you don't waste your expensive TS1120 tapes? However, recently I've been playing around with another option. External dasd. Once you get a VSE system up (via tape), you have VSE Virtual Tape available. You can use that with the IP flavor (instead of the VSAM flavor) to store VSE Virtual Tapes. Now, you can get a TB USB drive for around $1,500 and they are portable. How about buying 3, (Grandfather, father, son), and copy the offsite data tapes, this way? I'm still concerned about IP performance. Another variant is to use a laptop with the extra hard drive. Use the extra hard drive as your VSE Virtual Tape storage area, and send the extra drive off site. In both cases, encryption is also a transparent option. These options might not work well in the larger shops, but they can afford the hardware for proper duplication. But for us smaller shops.....(I'm in the 2 TB size now) (Sorry Hans, I didn't get out of meetings until lunch time, so no 10:30 call today.) Tom Duerbusch THD Consulting >>> Hans Rempel <h...@hmrconsultants.com> 6/3/2009 9:38 AM >>> I have been reviewing entries in both lists and it appears that VM and VSE neither have a easy way of move virtual tape volumes from the VTS to and external tape media for offsite storage. I have been told that MVS has a facility (copy extract) to do this. For VSE I guess we could use Ditto tape copy to move virtual tapes to real one would be an option. One would need to write a rexx program to read a tape catalog/tape report and build the job to stack the tapes on one real tape. Is this the only option in VSE. Is there anything in VM. I guess I also find it hard to believe that the VTS itself has no internal/ backend process to do this. I have dual posted this query Thanks for your comments Hans
