[Lustre-discuss] How to bypass failed OST without blocking?

[Robert Olson]

Hi --

Setting up my system that has no OST failover, so would like to set  
for failout. Have the issues in the 1.6 betas been worked out in  
1.6.4.1?

Thanks,
--bob

On Mar 22, 2007, at 4:55 PM, Nathaniel Rutman wrote:

> Well, your question prompted me to try this out.
>
> There are two issues:
> 1. failout mode cannot be set on a live filesystem, and can't be  
> set with lctl conf_param.
> The wiki page has instructions for setting failout mode at mkfs time
> https://mail.clusterfs.com/wikis/lustre/MountConf
> You can also set failout mode with tunefs and writeconf:
>
> tunefs.lustre --writeconf --param="failover.mode=failout" /dev/sda
>
> There can be no Lustre servers or clients running when changing the  
> failover mode.
>
> 2. failout mode is broken in the 1.6 betas.  I have an untested  
> patch in bug 12005
> https://bugzilla.lustre.org/show_bug.cgi?id=12005
> Using failout mode in the betas without this patch will probably  
> lead to an LBUG on the OST.
>
>
> swin wang wrote:
>> In our test, we didn't set the failout mode in mkfs, but set it on  
>> the mdt/mgs
>> with lctl:
>>   lctl conf_param testfs-OST0001.failover.mode=failout
>> but it seem didn't work. when OST0001 is failed, the
>> client operation is still blocked (with 1.5.97).
>>
>> 2007/3/22, Nathaniel Rutman < nathan at clusterfs.com  
>> <mailto:nathan at clusterfs.com>>:
>>
>>     swin wang wrote:
>>     > We current use 1.5.97, we try to set it to failout mode, but it
>>     didn't
>>     > work
>>     > int this version, what we want is:  when read/write  the  
>> failed OST,
>>     > it return
>>     > IO errors, but still can create and read/write new files,  
>> when the
>>     > failed OST
>>     > is ok, we can read/write files on the failed OST.
>>     That's what failout mode it.  How did you try to set it?
>>
>>     > I'm not sure if the 1.4.x version with "failout" mode can
>>     provide what we
>>     > want?
>>     >
>>
>>
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