How many bytes is a 3390 cylinder?
| Disk Type | Data Cylinders | Bytes per Cylinder |
|---|---|---|
| 3390-1 | 1113 | 849,960 |
| 3390-2 | 2226 | 849,960 |
| 3390-3 | 3339 | 849,960 |
| 3390-9 | 10017 | 849,960 |
What is DASD space?
CA Allocate DASD (Direct Access Storage Device) Space and Placement delivers allocation control for non-SMS (system-managed storage) data and extends the allocation control provided by IBM`s Data Facility Storage Management Subsystem (DFSMS).
How is space calculated in JCL?
Determine the actual BLKSIZE you will use.
- Determine the blocking factor (number of logical records in 1 physical record) you will use. This is usually considered optimal – 23476/record length. For 80 byte records, 23476 / 80 = 293.
- Determine the BLKSIZE – 293 * 80 = 23440.
How to calculate size of dataset in mainframe?
One easy way for a small file like this is to copy the file to a DD DUMMY output which will give you the record count (without actually creating a new file). Then multiply the recount times the lrecl and you get file size in bytes. Dividing total bytes by 1024 will give how many k/m bytes.
How many GB is a track?
/ 1GB holds roughly 230 songs (at 128kbps). That’s roughly 16 hours of music or 20 albums. / The average 2 hour movie is 1.5GB.
How much MB is a track?
The average song is 3.5 mins therefore 30.73 MB per average song.
Which is the highest storage capacity?
Petabyte (1,024 Terabytes, or 1,048,576 Gigabytes)
Which device has the highest storage capacity?
Samsung Announces 16TB SSD, ‘World’s Largest’ Storage Device for Data Centres. Samsung has announced a new solid-state drive powered by its new 3D vertical-NAND flash memory chips, which it says is the world’s highest capacity computer storage device.
What is space parameter in JCL?
SPACE Parameter in JCL is an Optional Keyword parameter that indicates the OS, the amount of memory allocation needed for a dataset while creating it and indicates the allocation units that the requested memory to be provided in. Instruct the system on the specific tracks that needs to be allocated to a data set.
What is primary and secondary allocation in JCL?
BEST PRACTICE is to allocate primary space as the maximum space required for the dataset, though there are exceptions. Secondary Space is allocated when a program uses up all the Primary space. Rather than abend, a new extent will be allocated on the same volume and the job will continue.
How do I determine the size of a mainframe file?
LRECL x Number of records – is a rough rule of thumb for total bytes. Another way is to view the file in 3.4 and get the number of tracks used, and assuming you’re on 3390 DASD then multiply the number of tracks by 56664 (no of bytes per track).
How many KB is a track?
DEC 8-inch formats
| Category | Drive designation | DEC RX01 |
|---|---|---|
| App. size | 250 KB | |
| Controller | Encoding | FM |
| Media | Track density (tpi) | 48 |
| Bit density (bpi) | 3,200 |
How many tracks are in a 3390 disk?
Every 3390 disk volume contains 56,664 bytes per track, 15 tracks per cylinder and 849,960 Bytes per Cylinder.
What’s the difference between the 3390 and 3380?
The data transfer rate — the speed that data can move to and from the disk surface — was also increased, from 3.0 megabytes per second for the 3380 family to 4.2 megabytes per second for the 3390. The 3390 was designed to maximize reliability and data availability.
When did the IBM 3390 direct access storage device come out?
When the IBM 3390 Direct Access Storage Device (DASD) was rolled out in November 1989, it offered up to 22.7 billion bytes (gigabytes) of storage and allowed customers to store more data in a single DASD than ever before.
How big is a 3390 hard disk in GB?
3390 disk numbers Model Model 1 Model 2 Model 3 EAV Tracks per Volume 16,695 33,390 50,085 up to 3,940,020 Cylinders per Volume 1,113 2,226 3,339 up to 262,668 Bytes per Volume 946 MB 1.89 GB 2.84 GB up to 223 GB