| Title: | VAX and Alpha VMS |
| Notice: | This is a new VMSnotes, please read note 2.1 |
| Moderator: | VAXAXP::BERNARDO |
| Created: | Wed Jan 22 1997 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 703 |
| Total number of notes: | 3722 |
In the following output from ANAL/SYS using the SHOW DEVICE DSA6000 command,
apparently the non-empty values of Master FL and Restart FL is unexpected, can
someone explain?
I/O data structures
-------------------
----- Shadow Descriptor Block (SHAD) 815602C0 -----
Virtual Unit status: 0001 normal
Members 1 Act user IRPs 0 VU UCB 8115A480
Devices 1 SCB LBN 00000060 Master FL 815605D0
Fcpy Targets 0 Generation Num 66872549 Restart FL 815605D8
Mcpy Targets 0 009B18C9
Last Read Index 0 Virtual Unit Id 00000000
Master Index 0 12611770
----- SHAD Device summary for DSA6000 -----
Device $2$DKB100
Index 0 Device Status A8 master,src,valid
UCB 81211B80 VCB 81326F80 Unit Id. 11620064 00000002
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 359.1 | EVMS::MORONEY | Thu Mar 20 1997 17:00 | 7 | ||
The offsets are 310 and 318 hex from the SHAD address, which sounds like they're likely to be empty queues, as these addresses are within the SHAD structure. Not enough info to help further. -Mike | |||||
| 359.2 | empty queues, likely | CSC32::M_DIFABIO | MOVL #OPINION,EXE$GL_BLAKHOLE | Tue Mar 25 1997 15:14 | 5 |
Always validate the queue to make sure. These queue's do look empty,
so that would indicate there are no I/O's queued to the DSA device.
Was a process hung indicating an incomplete I/O?
Mark d.
| |||||
| 359.3 | AMCFAC::RABAHY | dtn 471-5160, outside 1-810-347-5160 | Wed Mar 26 1997 15:27 | 7 | |
Ah, yes, the VALIDATE QUEUE command confirms it is empty. No process was hung. No process even has a channel assigned. On VAX an empty Restart FL is displayed differently than Alpha -- it shows up as the word empty. A customer might be getting into a situation where they do loose an I/O. I was just trying to reproduce the conditions on my workstation. | |||||