Re: Performance for DFDSS with ORACLE Tape Drives VSM5 ( was Change tape block size)
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_TIMEbackup source data type VOLSER VTV size(mb)VTV size(comp)(mb) tape block size(KB) Total block count reported by DSS 11:31:4111:33:12Extended format compressed PT3968 1854.15 647.77 128 33879 11:33:1211:34:42Extended format compressed PT3974 1854.15 647.77 64 33879 11:34:4211:36:17Extended format compressed PT3976 1854.15 647.77 256 33879 12:22:5012:31:20Extended format PT4034 6280.18 371.56 128 223678 12:31:2012:39:35Extended format PT4043 6280.18 371.56 64 223678 12:39:3512:47:58Extended format PT4053 6280.18 371.56 256 223678 12:55:0912:58:34Basic PS,compressed PT4065 6273.86 360.15 128 49115 12:58:3413:03:06Basic PS,compressed PT4067 6274.57 367.9 64 98428 13:03:0613:05:59Basic PS,compressed PT4072 6273.51 355.32 256 24527 13:08:0713:11:37Basic PSPT4075 6273.86 360.15 128 49117 13:11:3713:16:00Basic PSPT4078 6274.57 367.9 64 98426 13:16:0013:19:04Basic PSPT4082 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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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, ADRDSSU will report same number of blocks in message IEC205I. And the backup speed will also be same no matter what block size I specified in JCL. Here is my testing result: st_TIME end_TIMEbackup source data type VOLSER VTV size(mb)VTV size(comp)(mb) tape block size(KB) Total block count reported by DSS backup speed(MB/S) 11:31:4111:33:12Extended format compressed AB3968 1854.15 647.77 128 33879 20.38 11:33:1211:34:42Extended format compressed AB3974 1854.15 647.77 64 33879 20.60 11:34:4211:36:17Extended format compressed AB3976 1854.15 647.77 256 33879 19.52 But this is not true for BASIC PS dataset, for basic PS dataset, I did a similar testing: st_TIME end_TIMEbackup source data type VOLSER VTV size(mb)VTV size(comp)(mb) tape block size(KB) Total block count reported by DSS backup speed(MB/S) 13:08:0713:11:37Basic PSAB4075 6273.86 360.15 128 49117 29.88 13:11:3713:16:00Basic PSAB4078 6274.57 367.9 64 98426 23.86 13:16:0013:19:04Basic PSAB4082 6273.51 355.52 256 24528 34.10 Please note the total block count reported by DSS is different when specifying different tape block size. My goal was: To improve backup performance for extended format PS dataset(DB2 image copy on dasd)using ADRDSSU,I am trying to use 256KB to improve performace,but I can't. Do you have any ideas? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 262144. Is that ok for a program to write in 56062, but read in 262144? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: RMM and tape dataset block size
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 in RMM, the z/OS is 1.13. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
Lizette, Can I use ibm tools(BADBLKSZ) to check my tape dsn block size using EREP history file? regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 CA=6110 DEVTYPE=3490SIO=156 BR=1 BW=898352 LST=65692 21 VOL=AB0540 CA=6110 DEVTYPE=3490SIO=12161 BR=1 BW=774929 LST=12161 015 VOL=AB0539 DD=ODD OPE=15.23.04.71 CRTDT=14125 EXPDT=14126 DISP=New DSORG=PS RECFM=U NVOL=1 VOL=AB0539 DEVTYPE=3490 EXCP=65653 LTYP=SL FLSQ=1 DEBVL=1 DCBBL=65653 DSSNO=PT0539 STEP=BACKUP PGM=ADRDSSU 14XF1=128 14CIS=18092639 14TKL=49878 015 VOL=AB0540 DD=ODD OPE=15.28.37.31 CRTDT=14125 EXPDT=14126 DISP=New DSORG=PS RECFM=U NVOL=1 VOL=AB0540 DEVTYPE=3490 EXCP=12122 LTYP=SL FLSQ=1 DEBVL=1 DCBBL=12122 DSSNO=PT0541 STEP=BACKUP PGM=ADRDSSU 14XF1=128 14CIS=18092639 14TKL=49878 The backup program was ADRDSSU, but it seems no block size was reported by ADRDSSU. The OS is z/OS 1.13. Why can't I have tape block size reported? The only source I can find tape block size is in IBM RMM. Both jobs are using 256KB tape block. Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 any paramter to allow dss to use 256KB block size? However in both case, RMM will record 262144 as block size, that's the reason I ask if I can trust RMM. regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
Lizette, Here it is: For PS dataset: DUMP - OUTDDNAME(ODD) - DATASET(INCLUDE(TEST.DATA)) - TOL(ENQF) SPHERE For SMS compact extended format dataset: DUMP - OUTDDNAME(ODD) - DATASET(INCLUDE(TEST.AB2F.**)) - TOL(ENQF) SPHERE -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
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 the blksize of tape data set, does LBS or BLS show this? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: RMM and tape dataset block size
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 data class with compression set to be on, the speed dropped to 20MB/s, the backup program is ADRDSSU. In RMM, I can see the tape block size is 262144 bytes, however from DAT, I can't see 262144, which is very strange.That's the reason I am asking this question again. I am trying to copy the compressed data to be an uncompressed one, however, I failed to do that, can anyone give me suggstion on how to uncompress a dataset and copy it to a new loacation, so that I can backup the uncompressed data? Regards Victorh -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
RMM and tape dataset block size
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Change tape block size
If without SAS, can I format SMF 21 to get block size written to tape? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Testing maximum adrdssu backup speed
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: How to determine tape dataset blksize
Thank you all for your kind help. Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: DB2 image backup and DFSMSdss dataset backup
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 this via RMF? Can I observe DB2 use more channel resource than DSS via RMF? regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: DB2 image backup and DFSMSdss dataset backup
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 concurrently? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: DB2 image backup and DFSMSdss dataset backup
yes, opt(4) is used. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Method to measure usage of a physical tape
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 record this? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Method to measure usage of a physical tape
I use both IBM 3590 and ORACLE T10K tape drive. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Method to measure usage of a physical tape
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). -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
DB2 image backup and DFSMSdss dataset backup
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 minutes, however if run concurrently with DB2 image backup, it may take about one hour to finish. Is there a method to allow DSS backup run more smoothly even if it is running concurrently with DB2 image copy? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Converting STCK(tod) to readable format
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
Victor
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Re: Sharing TS7700 across sms plex
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 allow to be read as PRIVATE volumes. -- Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Varying off path while it is in use
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 upgrade code in interface cards of virtual tape products, I may need offline path to the interface card I need service, is it OK to offline path to one of the interface card while it may be in use? Will z/OS protect the path while there are any outstanding I/O that don't complete? The bottom question is: Is it safe to offline path or will it cause backup job(for example ADRDSSU) job to abend? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Sharing TS7700 across sms plex
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: IGGCSI to retrieve tape volume serial
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 Number of extents But I can't find how to locate number of extents for a non-vsam dataset.Do you have an idea? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: IGGCSI to retrieve tape volume serial
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Rmm extended dataset
Thanks Mike, after checking master or user status volume, I created my own customized report. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
IGGCSI to retrieve tape volume serial
Hello, Is it possible to retrieve a tape dataset's volser via iggcsi? what's the type of a tape data set? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: IGGCSI to retrieve tape volume serial
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? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Rmm extended dataset
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-volume tape dataset's volcnt, could you help? Regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Rmm extended dataset
Hello, I am trying to create a rmm report to include: dsn, volser,volseq, volcnt can I use RVUSE as volcnt? regards Victor -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
