Executing the savlib command twice

Tags:
Automated Tape Library
iSeries
SAVLIB
Tape Backups
It has been propose to have a hot tape backup in our tape library in a reserved slot. we have 22 available slots the 23rd is reserved for the cleaning cartridge. Slots 1 - 7 are used daily. What they want is to execute a second save library command to let say slot 21. This would be used every night. This is so we could have the current backup in house. Normally are daily backup is taken to a secure site. Any opinions will be welcome on this process.
ASKED: February 8, 2011  2:48 PM
UPDATED: February 15, 2011  12:38 PM

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I see no problem in doing this.
What is your concern?
My questions would be these:
Are you running a lot of stuff an night where this would be impacking?
Are you saving just one lib or the entire system?
Do you use SAVACT?
How long does it take?
Is SAVCHGOBJ an option?
*
So if you give us a little more information, we can give better and more specific advise.

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  • AS400PCFileTransfer16
    Managers concern is he need the last backup tape and it had been taken to the secure location, so someone had to go get it. Its the first thing that runs at the end of the nightly shipping prior to running what we call end of day. We are only backing up 15 libraries using the SAVLIB command without SAVACT and it takes 30 min. The backup and end of the day processing must be complete before 7:30 AM. The start time varys depending on the volume of shipping during second shift.
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  • HMSSL2K
    There should not be a problem with that. We do a DUPTAP command and send the originally off site for 14 days. Are you doing a SAVLIB command to perform the save with SAVACT?
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  • AS400PCFileTransfer16
    No we doing the SAVLIB with the SAVACT parm set to *NO. The program that is running the savlib command was written a few years ago and never really changed. With the execption of the hardware.
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  • CharlieBrowne
    The DUPTAP command would seem to be the best option as you can submit that to batch and run with a priority so as to not have much impact on the rest of the system. Also, this would not cause any object lock conflicts by doing a 2nd save.
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  • PGMBOB
    Another, possibly faster option is SAVLIB to a SAVEFILE. The process can submit the SAVSAVF to the tape, and SAVSAVF to another tape. The SAVF can eliminate the need for the second copy and should be faster than the tape backup (no tape wait). There is a copy on the system in the savefile. The TAPE goes to offsite location The tip is to make sure you have enough disk capacity for the savefile. Create a library to save the savefile(s) The savfiles can be named for the library they contain. I run a list of libraries to a file. The CLP reads the file, CRTSAVF or CLRSAVF and does a SAVLIB to *SAVF for each library found. (no new libraries missed) The Tape job makes a file of the SAVEILE(s) in the save library. Read this file to SAVSAVF to the tape. The SAVF can also be saved on another server. We use this for nightly backup where a night operator is not available or needed to swap tapes.
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  • TomLiotta
    ...and should be faster than the tape backup (no tape wait). When streaming tape drives starting taking hold, the advantage started dropping. Nowadays, it's not uncommon to faster saves to tape than to disk. The LTO-4 drives can often outperform disks. But it depends on elements such as DASD capacity, RAID configuration, controller buffer sizes and some other elements. With streaming tape drives, "tape wait" isn't necessarily much of a factor. If the system is capable of supplying data at a rate that keeps the tape occupied (and controller buffers can make a significant difference), waits may disappear. Tom
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  • AS400PCFileTransfer16
    [...] Executing the savlib command twice [...]
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  • pdraebel
    Dupliating the tape would seem the best option, but you should have 2 drives available, so it comes down to the possibilities of your hardware.
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  • DanTheDane
    "This is so we could have the current backup in house. " If you have enough disk-space, I recommend you to do a save to an imagecatalog (a 'virtual tapedrive'). Restore from a virtual tapedrive is lightning fast. We do all backup to virtual tapes, and thereafter we DUPTAPs to physical tapes with low priority during daytime. Thus our nightly backup always finishes since we created multipe virtual tapes for our multi-tapevolume-backup. We thereby have 'released' our system for production in daytime, since we no longer have the morning-message "Insert next tape..". DanF Find more on this solution in the IBM Infomation Center (look for 'virtual backup media').
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  • WoodEngineer
    I noticed that you are using SAVACT(*NO). Have you confirmed that the data you want is indeed being saved to tape?
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  • AS400PCFileTransfer16
    [...] Executing the savlib command twice [...]
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  • AS400PCFileTransfer16
    [...] 8. The community’s consensus is that there is nothing to worry about when executing the savlib command twice. [...]
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