[Info-vax] Processes hang on USB-access

[Joukj]

Volker Halle wrote:

> 
> You may consider to start IO tracing ( see http://de.openvms.org/Spring2009/05-sda_extensions.html#IO ) in the runn9ing system, wait for the next hang, force a dump and then look at the IO trace in the dump...
> 

I tried to switch on tracing again after the last restart of the 
machine. But when I did, I saw no traces of operations on DNA2, while 
I'm sure it is functioning. Then I did:


SDA> sh dev dna2

I/O data structures
-------------------
HOPAK$DNA2                                     WD My Passport 2626 UCB: 
82706D80

Device status:   00021810 online,valid,unload,lcl_valid
Characteristics: 1C4D4008 dir,fod,shr,avl,mnt,elg,idv,odv,rnd
                  20010281 clu,srv,nnm,nlt,dtn
SUD Status       00000000

Owner UIC [000001,000004]   Operation count     135411   ORB address 
82707180
       PID        00000000   Error count              0   DDB address 
  82706C80
Alloc. lock ID   150007EE   Reference count          3   DDT address 
81E331A0
Alloc. class            0   Online count             1   SUD address 
826EE740
Class/Type          01/B6   BOFF              00000110   VCB address 
828B3480
Def. buf. size        512   Byte count        00007C00   CRB address 
82706D00
DEVDEPEND        88000101   SVAPTE            829A3CE0   I/O wait queue 
82706E38
DEVDEPND2        00000000   SVPN              00006998
DEVDEPND3        00000000   DEVSTS            00000004
FLCK index             3A
DLCK address     82626700

I/O data structures
-------------------
         *** I/O request queue is empty ***

                 --- Volume Control Block (VCB) 828B3480 ---

Volume: HOPAK3           Lock name: HOPAK3
Status:        A0 extfid,system
Status2:       06 nocache,mountver
Status3: 00000032 struc_ods5,special_files,noxfccache

Mount count            1    Rel. volume            0    AQB address 
826A6D00
Transactions           2    Max. files      16711679    RVT address 
82706D80
Free blocks   2204107920    Rsvd. files           10    FCB queue 
828B3080
Window size            7    Cluster size          16    Cache blk. 
828B2580
Vol. lock ID    3C000908    Def. extend sz.        5
Block. lock ID  3D0005B6    Record size            0

I/O data structures
-------------------

                     --- ACP Queue Block (AQB) 826A6D00 ---

ACP requests are serviced by the eXtended Qio Processor (XQP)

Status: 14 defsys,xqioproc

Mount count           19    ACP type           f11v2    Request queue 
00000000
                             ACP class              0

         *** ACP request queue is empty ***



So no IPR now?????? no I/O operations listed?????
I'm sure the USB-disk is working. I'm performing BACKUP and the 
backup-save-set is still growing.






Then I checked the USB-DRIVE on the boot-member of the failing one. This 
one is already working over 200 days without a hang. It shows in SDA the 
same sort of output as shown above. So also no IPR and no I/O operations.


What is going on?????

At least I will let the backup run for now to see if it also hangs in 
this "setup".


               Jouk