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тАО07-24-2003 06:30 PM
тАО07-24-2003 06:30 PM
Using analyze to repair sys$sysdevice
I find that there is some data inconsistency in my VMS system disk.
Is it safe if i just do a "ANAYZE /DISK/REPAIR SYS$SYSDEVICE" to my sys$sysdevice ?
Regards,
Patrick.
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тАО07-26-2003 01:10 AM
тАО07-26-2003 01:10 AM
Re: Using analyze to repair sys$sysdevice
It depend if you have a good backup prior to the inconsistency ? and if this is a critical system you are the only juge of that, but why dont you attach the analyze/disk sys$sysdevice output onto a reply to this message perhaps with a littel more informations some could tell you if it is harmless or not...
Also what do you mean by inconsitency ?
What ever I would take a system disk backup now !
just to be sure.
Jean-Pierre
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тАО07-26-2003 05:09 AM
тАО07-26-2003 05:09 AM
Re: Using analyze to repair sys$sysdevice
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тАО07-28-2003 10:28 AM
тАО07-28-2003 10:28 AM
Re: Using analyze to repair sys$sysdevice
But unfortunately, the system disk is the oddball of the lot. (You can't dismount it and still analyze it.)
One of the factors you have to look at is whether the count of index bitmaps that are in error is the same as the size of the SYSGEN parameter ACP_FIDCACHE (I think). Also, I don't know if this potential for disagreement has been fixed. But I know that if you look at the stuff already written to the disk, it does not ALWAYS match the content reported through the F11ACP calls. This is because some data structures have been cached and are not yet written to the disk.
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тАО07-29-2003 12:54 PM
тАО07-29-2003 12:54 PM
Re: Using analyze to repair sys$sysdevice
HTH
Marty
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тАО07-30-2003 01:52 AM
тАО07-30-2003 01:52 AM
Re: Using analyze to repair sys$sysdevice
another possibility is to use Ton Dorland's DFU Verify. You find this on the OpenVMS freeware CD. DFU verify is safe, very fast, has very handy features and it does not lock the disk as Analyze does (with repair option). The /Rebuild has been very useful to me. Here's the help text:
" The Verify option provides a function equivalent to ANALYZE/DISK, but many times faster. Verify will report files with invalid backlinks, lost files, and blocks which are allocated by more than 1 file. Also the BITMAP and QUOTA files are checked. The /FIX qualifier allows some basic repair actions without locking the disk. The /REBUILD qualifier will rebuild INDEXF.SYS, BITMAP.SYS and QUOTA.SYS if necessary. Note that /REBUILD will lock teh disk for a short period of time.
"
Just give it a try!
Cheers,
Henk
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тАО08-30-2005 12:27 AM
тАО08-30-2005 12:27 AM
Re: Using analyze to repair sys$sysdevice
Pointer to help on points:
http://forums1.itrc.hp.com/service/forums/helptips.do?#33
Thanks in advance.
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тАО08-31-2005 11:32 PM
тАО08-31-2005 11:32 PM
Re: Using analyze to repair sys$sysdevice
as Martin Johnson have sugested, boot from another disk before dooing analyze. This command will cause system to hang, while doing analysis. Not suitable behavior for mission critical system ;o).
Michal