[Lustre-discuss] Hardware upgrade routes

daniel.hagon at stfc.ac.uk daniel.hagon at stfc.ac.uk
Mon Nov 16 06:17:30 PST 2009


Hi,

 

I'm interested to find out what possible solutions there are for
upgrading storage hardware within a cluster over time, either following
a failure or just through nodes coming to the end of their normal
working life. We would expect a cluster to exist for many years whereas
the individual nodes may only last a few years each. Ideally it should
be possible to migrate data off an OST as required but there doesn't
appear to be anything in the manual which covers this use case
specifically.

 
The closest thing seems to be in section 4.3.11 of the manual "Removing
and Restoring OSTs"
(http://manual.lustre.org/manual/LustreManual18_HTML/ConfiguringLustre.h
tml#50532400_57420):

 

"OSTs can be removed from and restored to a Lustre file system.
Currently in Lustre, removing an OST really means that the OST is
'deactivated' in the file system, not permanently removed. A removed OST
still appears in the file system; do not create a new OST with the same
name."

 

Thus one route to migration to new hardware could be to remove an OST
(making sure the name is not reused) then use step 2.5 in section
4.3.11.1 to copy to the _new_ hardware, rather than recovering to the
same hardware.

 

Does anyone have experience with this type of use case or knowledge of
alternative ways of handling this which they could describe for me?

 

Many thanks,

Daniel.

 

*******************************************************

British Atmospheric Data Centre

STFC Rutherford Appleton Laboratory

Chilton, Didcot, Oxfordshire, OX11 0QX

*******************************************************

 


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