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Conference decwet::advfs_support

Title:AdvFS Support/Info/Questions Notefile
Notice:note 187 is Freq Asked Questions;note 7 is support policy
Moderator:DECWET::DADDAMIO
Created:Wed Jun 02 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1077
Total number of notes:4417

998.0. "ADVFS HW-fault -> panic immediately?" by ATZIS1::PUTZENLECHNE () Wed Feb 05 1997 14:15

    Hi!
    Is it possible that in a domain which ist built up with more
    than one physical partition (using the addvol-command), a write
    operation may complete, even if one of the disk (partitions) is
    offline?
    
    for example:
    
    i have a domain with two physical partitons named "test_domain"
    
    # ls -l /etc/fdmns/test_domain
    
    lrwxr-xr-x   1 root     system        10 Jan 29 21:31 rz8c ->
    /dev/rz8c
    lrwxr-xr-x   1 root     system        10 Jan 29 21:31 rz9c ->
    /dev/rz9c
    
    lets imagine my operating system writes to a file which is
    perhaps only located on rz8c. Now the disk rz9c fails for some reason
    (hardware fault). Will the actual write operation of my file complete
    since it only accesses rz8c or will the domain panic immediately?
    
    Helmut 
T.RTitleUserPersonal
Name
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998.1Should succeed...NETRIX::"arti@oleum.zso.dec.com"Arti KumarWed Feb 05 1997 18:3611
The write to a file that is located entirely on one
disk should succeed. If the other (failing) disk is offline,
an access to files on that disk will return an error.
If the failing disk is still online then the next metadata
access to it will cause a domain_panic, and the next user
access to it will return an error.

If you notice that one of the disks in a multi-volume
domain is returning errors or is failing you should backup
the domain, and then remove the offending disk using rmvol.
[Posted by WWW Notes gateway]
998.2thanksVNABRW::PUTZENLECHNEThu Feb 06 1997 07:5415
    
    Thank You!
    
    The reason i asked these questions was that we lost a database
    because one disk within a domain went offline and after
    bringing it back online the database (oracle) was inconsistent.
    
    We try to find out the reason for this behaviour together with
    oracle, because normally the database should be able to recover from
    such hardware-failures.
    
    regards,
    
    Helmut