How to reset the error count of disk.

[kumar sanjay_1]

There is general Problem with disk error in VMS. if i analyze the error it will show me the type of errors, As I know the error count is stored in Badblk.sys in root directory. can I reset the error count without rebooting the system? Is there any way to reset the error count to make it zero?



$ sh dev dsa6012:

Device Device Error Volume Free Trans Mnt
Name Status Count Label Blocks Count Cnt
DSA6012: Mounted 0 VAX_app12 32 2 2
$4$DUA3300: (UKMH4D) ShadowSetMember 46 (member of DSA6012:)
$4$DUA3200: (UKMH3F) ShadowSetMember 2 (member of DSA6012:)


If I analyze the error log i will get this error.

DEVICE SUMMARY LOGGED BY SID 17000201

ERRORS TIMEOUTS UCB ERROR UCB OPERATION
[HARD] [SOFT] [HARD] [SOFT] COUNT COUNT

_$4$DUA3200:
""
0. 2. 0. 0. 0. 0.
------- ------- ------- ------- ------------ -------------
TOTALS 0. 2. 0. 0. 0. 0.

_$4$DUA3300:
""
0. 30. 0. 0. 0. 0.
------- ------- ------- ------- ------------ -------------
TOTALS 0. 30. 0. 0. 0. 0.

[Karl Rohwedder]

If your VMS version is not too old you may use the SET DEVICE/RESET=(ERROR,OPERATION) command.
For older versions (and for VAXen) you may use the ZDEC utility (found on the Freeware V8).

regards Kalle

[labadie_1]

$set device dsa200:/reset=error
will reset the error counter on recent Vms versions. For older versions, various hacks can be found on comp.os.vms for example.

Use with caution
:-)

[kumar sanjay_1]

currently I am using the Open VMS 6.2

[Karl Rohwedder]

The ZDEC utility works fine on V6,2, used it a lot before VMS was enhanced.
You find it here:
http://h71000.www7.hp.com/freeware/freeware80/zdec/

regards Kalle

[Volker Halle]

Please note that the error count is NOT stored in any file on disk, but in the UCB (Unit Control Block) in memory.

You should analyze the errors with $ ANAL/ERROR without using /SUMMARY. Then decide based upon the error detail information, what should be done. Resetting the error count does not make the underlying HW problems go away.

Volker.

[Guy Peleg]

Sanjay,

If you feel adventurous, you may write
a program to reset the error count.

A quick (and dirty) approach would be:

* assign a channel to the device.
* Call ioc$chan_to_ccb to get the CCB
* Get the address of the UCB from CCB$L_UCB
* set UCB$L_ERRCNT to 0

Guy Peleg
BRUDEN-OSSG
http://www.brudenossg.com

[Volker Halle]

.. and don't forget to call $CMKRNL first and make real sure, you do not make any programming mistakes leading to exceptions ! That would also clear the error count - by a crash and reboot ;-)

Volker.

[Guy Peleg]

The call to sys$cmkrnl is required
before accessing the UCB. IOC$CHAN_TO_CCB
can be called from user mode.

fwiw,

Guy Peleg
BRUDEN-OSSG
http://www.brudenossg.com

[Ian Miller.]

Really adventurous people use XDELTA to clear device error counts :-)

However using zdec or clear_errors is a better idea.

http://h71000.www7.hp.com/freeware/freeware80/clear_errors/