Recently I ran the Disaster Recovery restores using FDR DRP. The parameters
used follow:
RESTORE TYPE=DRP,CONFMESS=NO,MAXTAPES=12,COPY=2,
CPYVOLID=YES,VOLRESET=YES,SMSPROT=NONE
SELECT VOL=HSMBC1,NVOL=SG70E7,GEN=CURRENT,CYCLE=00
SELECT VOL=HSMBC2,NVOL=SG70E8,GEN=CURRENT,CYCLE=00
SELECT VOL=HSMJRL,NVOL=SG70E9,GEN=CURRENT,CYCLE=00
SELECT VOL=HSMMCD,NVOL=SG7800,GEN=CURRENT,CYCLE=00
plus some 400 additional select statements follow.
Initially there were 12 tapes spinning concurrently but this number gradually reduced to 1 which when that tape had restored its' last volume, a new set of 12 tapes were mounted. I watched this process repeat several times during the course of the night.
Anyone have any idea how or if I can keep 12 tasks running concurrently?
I posed this question to Innovation Tech Support some time ago, but got no response.
Dave, sorry that you got no response but we have no record of getting a
question from you. If you emailed the question, it was probably
misaddressed or something. The proper email address is
[EMAIL PROTECTED]
After sorting the disk volumes by backup tape volser and file sequence,
FDRDRP selects the first 100 disks in the list. Those 100 disks are
completely restored before we start the next set of 100. This explains
the behavior you saw.
Some customers submit multiple FDRDRP jobs, with no more than 100
SELECTs each, to get more concurrency. If multiple jobs need the same
tapes, FDRDRP can pass tapes back and forth between then without
dismounting, just like it does in a single FDRDRP step. However, we
don't attempt to optimize tape usage between jobs, so a given tape may
be mounted more than once, depending on when it is needed in each job.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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