Hello,
I've noticed a strange dss behavior and want ask explanation:
After I finished dss backup, I always received a message similar to this:
15.29.56 JOB31114 IEC205I ODD,BKDS,BACKUP,FILESEQ=1, COMPLETE VOLUME LIST,
870
870 DSN=BKUP.D003,VOLS=PT0541,TOTALBLOCKS=12122
Is the block counts reported the real tape blocks written to tape or something
else?
I've noticed that for BASIC PS and extended format PS, it is different,below is
my testing:
st_TIME end_TIME backup source data type VOLSER VTV size(mb) VTV
size(comp)(mb) tape block size(KB) Total block count reported by DSS
11:31:41 11:33:12 Extended format compressed PT3968 1854.15
647.77 128 33879
11:33:12 11:34:42 Extended format compressed PT3974 1854.15
647.77 64 33879
11:34:42 11:36:17 Extended format compressed PT3976 1854.15
647.77 256 33879
12:22:50 12:31:20 Extended format PT4034 6280.18 371.56 128
223678
12:31:20 12:39:35 Extended format PT4043 6280.18 371.56 64
223678
12:39:35 12:47:58 Extended format PT4053 6280.18 371.56 256
223678
12:55:09 12:58:34 Basic PS,compressed PT4065 6273.86 360.15
128 49115
12:58:34 13:03:06 Basic PS,compressed PT4067 6274.57 367.9
64 98428
13:03:06 13:05:59 Basic PS,compressed PT4072 6273.51 355.32
256 24527
13:08:07 13:11:37 Basic PS PT4075 6273.86 360.15 128
49117
13:11:37 13:16:00 Basic PS PT4078 6274.57 367.9 64
98426
13:16:00 13:19:04 Basic PS PT4082 6273.51 355.52 256
24528
That is:
For basic PS backup,I can change block size using BLKSIZE in JCL and the
resulting block count reported by rmm and dss will match, the result is: Bigger
block size, less block count,backup speed is much quicker
But for extended PS backup,no matter what specified in JCL,the block count
reported by dss will be same, and it does not match with what's recorded by
rmm, and speed are same for whatever block size.
Could you explain?
regards
Victor
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