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 b
Lizette,
Can I use ibm tools(BADBLKSZ) to check my tape dsn block size using EREP
history file?
regards
Victor
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The strange thing is someone helped me find from GTF trace when dumpping an
extended format PS dataset, 56062 is used as tape dsn block size, however when
reading the same tape dsn, 262144 is used.It is very confusing, and at the same
time, the block size specified in JCL matched what's recorded
If block size specified in JCL is max block size the program can use when
writing to tape, then I think I can' chage the block dize dss use to write to
tape dsn. From GTF trace, someone helped me find dss was using 56062 as the
block size to write, however when read, from SMF , we found dss use
Hello,
First I need thank you who replied to my question.
I should introduce my problem's background and my concern.
The tape is virutal tape of oralce, vsm5.
I am backing up extended format PS dataset to VSM5 using ADRDSSU.
I tested using dss to backup, no matter what block size I specified in JCL
Lizette,
Here it is:
For PS dataset:
DUMP -
OUTDDNAME(ODD) -
DATASET(INCLUDE(TEST.DATA)) -
TOL(ENQF) SPHERE
Radoslaw,
Thank you very much.
Your method of showing dsn block size is very good.
I got:
ICE802I 0 BLOCKSET TECHNIQUE IN CONTROL
ICE905I 0 I : RF=192,LR=0,BLK=229376,BCT=26
Regards
Victor
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Hello experts,
First thank you for your kind reply and patience.
On same system, when I backup PS dataset to tape, dss will use roughly 256KB
block size, however, when backing up SMS compacted extended format dataset(DB2
image copy),dss will use around 56KB block size, is it normal?Can I change a
In RMM, I checked the block size = 262144, which is 256KB in size.
And if we can't trust it, and does dss program record block size in SMF 21
record?
Or Is there another method to check tape block size, ie using DITTO?
Regards
Victor
--
I just tested backup from both SMS compact dataset and non-sms normal PS
dataset to tape.
The data are same, the normal PS dataset was created by ICEGENER.
I got speed of about 39.24MB/s from normal PS dataset to tape, but 21MB/s from
compact dataset.
By using DAF, I got :
21 VOL=AB0539
What I am facing a problem is :
When I tried to backup compressed dataset that have compression set to be on in
its data class, the backup speed will slow down dramatically.
For example, when I backup z/os 1.13 sysres volume, I got speed of about
40MB/s, however, when backup data that have its da
Hello experts,
I use DAT format SMF reocrd, but have difficulty understanding its meaning, can
you explain:
021 VOL=M01621 CA=081E DEVTYPE=3490 SIO=3238 BR=1 BW=3197120 LST=199846
LBS=65536
021 VOL=M10992 CA=0B3F DEVTYPE=3490 SIO=56633 BLS=28672 BR=1 BW=3515420
LST=56633
I want to know
Hello experts,
I am trying to determine the tape dataset block size, can I trust what recorded
in TMS's catalog? Is the block size accurate?
If the answer is YES, then I will not bother to dump SMF 21.
regards
Victor
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If without SAS, can I format SMF 21 to get block size written to tape?
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To check the result blksize, can I trust what's recorded in TMS?
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Hello all,
Is there a way to centrally change default tape block size?
Can TAPEBLKSZLIMIT in DEVSUPxx do this?
Regards
Victor
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Hello,
I am going to test maximum backup speed using adrdssu to virutal tape storage,
I want to memory/virtual storage as source and is it possible to create a temp
dataset in VIO, then write it to the virtual tape storage via adrdssu?
regards
Victor
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Thank you all for your kind help.
Regards
Victor
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Hello all,
I am using RMM as tape management software, and how can I determine tape data
set blksize, is blksize recorded by RMM correct?
Regards
Victor
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Previously I thought that DSS has short chain length I/O while DB2 image copy
have long chain length I/O,so DB2 will use more channel resource than DSS
backup, is it true?
If the workload cause slow down of virtual tape storage, ie, saturating vitual
tape storage front end channel,can I observe
yes, opt(4) is used.
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The db2 image backup is backing db2 data file online, while dss backups
different datasets that are not part of db2 managed. But when they both write
to same vritual tape devices, dss backup job slowed down by db2 image backup.
Is there a method to prevent this while allow both jobs ran concurre
Hello experts,
Occasionally in my shop, DSS dataset backup will run concurrently with DB2
image backup, the targe devices are Oracle virtual tape storage, however, it is
noticed that DSS backup will be slowed down by DB2 backup. For example, if DSS
backup run indepently, it may run about 10 min
For a given cartridge, I want to know how much space is used, how much left(or
how much data can I stack, or calculate compression ration if the data is
compressable and tape drive has compresstion turned on).
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I use both IBM 3590 and ORACLE T10K tape drive.
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Hello all,
I am using physical tape drive with high capacity which connect via FICON
director with CPU,there is no virtual tape storage used, data is directly
backed to physical tape drive,my question is how can I determine how much space
used for a given physical cartridge? Does TMS software re
Hello,
There are two files:
file 1: 1-44 contans dsn names, sorted in ascending order,no duplicate names
file 2:
1-44 contains dsn names
45 is ,
46-49 is 4 digits chars
50 is ,
51-54 is 4 digits chars
the files is sorted in ascedning order, keys are multiple keys:1-44,51-54,46-49
Can I use sort t
Hello,
I have a 8 byte TOD string,generated by STCK marco, and want to use following
ICETOOL control statements to convert to readable format,is it correct?
HEADER('START DATE') ON(1,8,DC1,E'/99/99') -
HEADER('START TIME') ON(1,8,TC1,E'99:99:99')
The TOD string is CA91AE07.
Regards
Vict
Hello Mike,
Could you point out how to do this in OAM manual:
---
For OAM, the TCDB cannot be shared, and what I normally recommend is that the
system from which you want to read the data you have a specific volcat for the
range in question, and pre-define all the volumes you plan to allo
Hello experts,
One dumb question:
For a Storagetek VSM product or IBM TS7700 product, I can have multiple
channels connecting with them, I also know that a tape I/O must complete on
the path where it is initiated. Please correct me if I am wrong.
Based on this assumption, if there is a need to u
Hello,
I have a request to sharing TS7700 across lpars belonging to different sms
plex, one lpar created data and the other lpar,away from 2000km+ need restore
the data, how to accomplish this? How to maintain TCDB?
Regards
Victor
Can I interpret this to get non-vsam used or allocated size?
DSCBTTR TTR of format-1 DSCB for non-VSAM data set
Regards
Victor
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Hi,
Already got to know how to retrieve DEVTYP using IGGCSI interface.
Another question is:
Is it possible to retrieve information regarding non-vsam dataset size, vsam
dataset size?
I found following records for non-vsam dataset:
NOBYTAU Bytes/allocation unit
NOBYTTRK Bytes/track
NOEXTNT Numbe
For a non-vsam dataset, how can I determine if it is a dasd dataset or a tape
dataset? What's the criteria to check if a dataset reside on tape?
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Hello,
Is it possible to retrieve a tape dataset's volser via iggcsi? what's the type
of a tape data set?
Regards
Victor
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Thanks Mike, after checking master or user status volume, I created my own
customized report.
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Hello Mike,
Is the field XVMDMVID or XVVOLCNT existing for multi-volume tape dataset?
I found some entries in rmm extended dataset has neither filed.
I guess only staring from a specific rmm version , above two filed began to
show up in RMM CDS.
I want to find a common method to calculate multi-v
Hello,
I always use following control statement to add scratch volumes for
non-system-managed library:
RMM ADDVOLUME D1 -
STATUS(SCRATCH) -
DENSITY(*) -
INITIALIZE(N) -
LABEL(SL) -
LOCATION(SHELF) -
MEDIANAME(3490) -
MEDIATYPE(*) -
POO
Hello,
I always use following control statement to add scratch volumes for
non-system-managed library:
RMM ADDVOLUME D1 -
STATUS(SCRATCH) -
DENSITY(*) -
INITIALIZE(N) -
LABEL(SL) -
LOCATION(SHELF) -
MEDIANAME(3490) -
MEDIATYPE(*) -
POO
Hello Mike,
Can I use XDVOLSEQ & XVMDMVID to calculate volcnt for multi-volume dataset?
Regards
Victor
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Hello,
I am trying to create a rmm report to include:
dsn, volser,volseq, volcnt
can I use RVUSE as volcnt?
regards
Victor
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