[Linuxha-users] Re: LinuxHA failover problems

[James MacLean]

Simon Edwards wrote:

>On Mon, 2005-01-24 at 21:42 -0400, James MacLean wrote:
>  
>
>>Looks like it's completely resyncing. On the plus side, no errors in 
>>clstat that I could see ;) :
>>    
>>
>
>Ok ... after more testing - below is the resync of a failed node joining
>the cluster ;
>
>[root at rserver2 ~]# head /proc/drbd
>version: 0.7.6 (api:77/proto:74)
>SVN Revision: 1663 build by root at rserver2, 2005-01-22 22:50:56
> 0: cs:SyncSource st:Primary/Secondary ld:Consistent
>    ns:13420 nr:116 dw:11824 dr:14580 al:12 bm:3 lo:83 pe:74 ua:106 ap:0
>        [========>...........] sync'ed: 44.5% (20508/33636)K
>        finish: 0:00:01 speed: 13,128 (13,128) K/sec
> 1: cs:Unconfigured
> 2: cs:Unconfigured
> 3: cs:Unconfigured
> 4: cs:Unconfigured
>
>Notice that is is only having to sync 33636Kb - the file system size is
>2Gb - so it is performing a partial resync.
>
>[root at rserver2 ~]# df /apache
>Filesystem           1K-blocks      Used Available Use% Mounted on
>/dev/drbd0             2088692     12812   2075880   1% /apache
>
>Now - for testing if you wish to simulate a node failure then doing a
>"reboot" or similar, or even pushing the off button if configured for a
>"soft reset" will cause a complete resync to take place...
>
>This is because unless you drop the power to the node it will still
>attempt to close files etc - which will update drbd on that node - now
>both nodes will have different generation counters ... and hence a full
>sync must be performed for the sake of sanity.
>
>Hence if you've not done so please re-try the tests - this time pulling
>the power cable or switching of the PSU at the rear of the machine ...
>you get the idea! Let me know if this works for you.
>
>Regards,
>Simon.
>
>  
>
Much much better. This time it rebooted and synced before I could even 
look at the sync log :). Now that's performance.

Thanks for all the help. I'm off to do more testing :).

later,
JES
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