zfs discuss - Feb 2009 - failmode= continue prevents zpool processes from hanging and being unkillable?

> Dear ZFS experts,
> somehow one of my zpools got corrupted. Symptom is that I cannot 
> import it any more. To me it is of lesser interest why that happened.
> What is really challenging is the following.
>
> Any effort to import the zpool hangs and is unkillable. E.g. if I 
> issue a "zpool import test2-app" the process hangs and cannot be 
> killed. As this originally happened on a Sun Cluster node, this 
> finally panic''ed the node, the storage resource failover to the
other
> node, hung again, panic''ed this node as well ..... Not a good
scenario
> for a production system.
>
> I now have 2 questions:
> 1. Could the hang and the unkillable process be avoided by setting the 
> zpool''s failmode to continue? It is currently set to
"wait" which I
> think is the default.
> 2. Is it true that I can only set the failmode property while the 
> zpool is imported? As trying to set it hangs and is unkillable.
>
>
> If I do a "zpool import" the following shows up:
>
> pool: test2-app
> state: ONLINE
> scrub: none requested
> config:
>
>        NAME        STATE     READ WRITE CKSUM
>        test2-app   ONLINE       0     0     0
>          c1t1d7    ONLINE       0     0     0
>
> errors: No known data errors
> If I truss "zpool import test2-app" the last lines are:
> open("/dev/dsk/c1t1d7s0", O_RDONLY)             = 6
> fstat(6, 0xFFBFB404)                            = 0
> modctl(MODSIZEOF_DEVID, 0x01D80038, 0xFFBFB48C, 0x0008CC24, 
> 0xFF21B480) = 0
> modctl(MODGETDEVID, 0x01D80038, 0x0000001C, 0x000E9F90, 0xFF21B480) = 0
> fstat(6, 0xFFBFB404)                            = 0
> modctl(MODSIZEOF_MINORNAME, 0x01D80038, 0x00006000, 0xFFBFB48C, 
> 0xFF21B480) = 0
> modctl(MODGETMINORNAME, 0x01D80038, 0x00006000, 0x00000002, 
> 0x000F1FC8) = 0
> close(6)                                        = 0
> ioctl(3, ZFS_IOC_POOL_STATS, 0xFFBFA4F0)        Err#2 ENOENT
> ioctl(3, ZFS_IOC_POOL_TRYIMPORT, 0xFFBFA5C8)    = 0
>
>
> Thanks
> Hartmut
>
-- 
Sun Microsystems GmbH           Hartmut Streppel		
Sonnenallee 1                   Systems Practice
D-85551 Kirchheim-Heimstetten	Phone:  +49 (0)89 46008 2563 
Germany                         Mobile: +49 (0)172 8919711	
http://www.sun.de		FAX:    +49 (0)89 46008 2572
mailto: hartmut.streppel at sun.com
Amtsgericht M?nchen: HRB 161028
Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten
Gesch?ftsf?hrer: Thomas Schr?der, Wolfgang Engels, Dr. Roland B?mer
Vorsitzender des Aufsichtsrates: Martin H?ring




-- 
Sun Microsystems GmbH           Hartmut Streppel
Sonnenallee 1                   Systems Practice
D-85551 Kirchheim-Heimstetten   Phone:  +49 (0)89 46008 2563 
Germany                         Mobile: +49 (0)172 8919711
http://www.sun.de               FAX:    +49 (0)89 46008 2572
mailto: hartmut.streppel at sun.com
Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten
Amtsgericht M?nchen: HRB 161028
Gesch?ftsf?hrer: Thomas Schr?der, Wolfgang Engels, Dr. Roland B?mer
Vorsitzender des Aufsichtsrates: Martin H?ring