Fsck downtime estimates

 

Hello, some questions for CFS people:

 

I am just fresh from a workshop where one whole day was dedicated to

file systems and Lustre was one of the key solutions. There was one

person attending this workshop who was asking every speaker to

comment on the fsck downtime for each of the file systems discussed,

and we looked at Lustre from this point of view, as well.

 

In case of Lustre, this downtime is estimated as 1-3 hours for 1 TB of ext3

in use on OST (depending on the underlying hardware), and may last of up

to several days per 1 PB for the metadata part.

 

Could someone from CFS suggest a sort of formula to calculate the fsck

downtime in a more accurate manner? This is often important when

planning for service levels. If a file system is spread over multiple OSTs,

which fsck operations run in parallel? May metadata checking be 

parallelized?  

 

Thanks ahead - Andrei.

 

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