[Lustre-discuss] Client and OST on Same Blade

[Kevin Fox]

FUSE did it some how, didn't they?

On Mon, 2008-07-07 at 14:12 -0700, Brian J. Murrell wrote:
> On Mon, 2008-07-07 at 17:00 -0400, Roger Spellman wrote:
> > Is there any problem having a Client and OST on the same blade?
> 
> If by "same blade" you mean on the same kernel sharing the same memory
> pool, yes, the problems that there were still are.  They are inherent
> problems in which the client and OST share the same memory pool and an
> effort to relieve memory pressure (by the client) requires memory be
> available to the OST.  Of course if the client is experiencing memory
> pressure so is the OST and the OST might not get the memory it needs
> to
> help the client get the memory it needs since it's all one pool of
> memory.  Indeed it's a deadlock.
> 
> I've discussed this with one of the more VM knowledgeable engineers
> than
> I and IIRC his feeling that here really is no fool-proof fix for this.
> Perhaps somebody more expert in the VM wants to explain further.
> 
> b.
> 
> 
> 
> 
> plain text document attachment (ATT1031826.txt), "ATT1031826.txt"
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