How to calculate used rate of a OST ?

Hello!

    In our service,  we use lustre for a huge storage. we don't need high performance,
but we need easy storage expansibility. In current lustre version(1.5.97) , wo noticed
that if OSTs have different 
capacity, or OSTs were added to system in different time
(e.g when some OSTs used rate up to 90%, we add some new OSTs), in these condition,
lustre  may  prompt storage is full, but actually some OSTs still have free capacity while
some OSTs if full. 
    We hope that if an OST's used rate up to 90% or 95%, it can be marked FULL, and 
avoid to use this OST. we plan to add a state FULL in structure lov_tgt_desc, when the
OST  used  rate up to   90% or 95%, set its state to FULL, and when create new object,
don't use these FULL OST.
    We want to know how to calculate used rate of a  OST,  is it like this:
        used rate = lov->lov_tgts[i]->ltd_exp->exp_obd->obd_osfs.os_bavail / ov->lov_tgts[i]->ltd_exp->exp_obd->obd_osfs.os_blocks
  ??

Thanks!
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