How many TRK are in a cylinder?
And 1 cylinder is 15 tracks. So let us take the accessible bytes in a track which is 55,996.
How many MB is 3390 cylinder?
3390 disk numbers
| Model | Model 1 | Model 2 |
|---|---|---|
| Tracks per Volume | 16,695 | 33,390 |
| Cylinders per Volume | 1,113 | 2,226 |
| Bytes per Volume | 946 MB | 1.89 GB |
How many bytes is a cylinder?
So there are 41943040 bytes in each cylinder.
How many MB are in a cylinder?
For an approximate conversion between cylinders and megabytes, use the formula “1 cylinder = 600 KB” (1 KB = 1024 bytes, 1024 KB = 1 MB). For conversion between cylinders and tracks, use the formula “1 cylinder = 15 tracks”. The megabyte formula will actually provide more UNIX disk space than needed.
How many tracks are in a cylinder mainframe?
Knowing that there are 15 tracks per cylinder on DASD, multiply the number of records per track by 15 to give you the number of records that can be stored on one cylinder.
How many cylinders does a mod 54 have?
* Storage Administrators refer to 3390 mod 9, 27, and 54 as large-volume support 10017 cylinders, 32760 cylinders, and 65520 cylinders respectively. These large volumes are all considered mod 9s with varying number of cylinders.
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 many records does a cylinder have?
Each cylinder could record 1200 to 1500 words. They could be reused 100 to 120 times by putting them in a machine that erased them by shaving off the surface.
How does mainframe calculate file size?
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 much MB is a track?
The average song is 3.5 mins therefore 30.73 MB per average song.
How many cylinders does a 3390 have?
| Disk Type | Data Cylinders | Alternate Cylinders |
|---|---|---|
| 3390-27 (2) | 32760 | 3 |
| 3390-54 | 65520 | 3 |
| 9345-1 | 1440 | 0 |
| 9345-2 | 2156 | 0 |