[Lustre-discuss] state of sun x4500 drivers

[Brian Behlendorf]

Recently I have also been doing some linux work with the x4500 and I have been 
using the sata_mv driver (v0.81).  The driver will properly detect all the 
drives and you may access them safely.  However, from what I've seen the 
driver needs some further development work to actually perform well.  I see 
only 30 MB/s write rates to a single disk using a simple streaming dd test.  
Much of this bad performance may simply be due to the fact that the driver 
can not enable the disk write-back cache forcing you to use write-thru mode.

So currently the bottom line is linux will work on the x4500.  But to get it 
working well someone is going to need to invest some development effort to 
improve the linux driver.

Good luck,
Brian


> There was some discussion about the driver/module for the sata
> controlers in the thumper (x4500) in the linux kernel.
>
> My question is if we bought one of these,  would the CFS kernel have
> everything needed to use the thumper in a safe way.
> Thank You.
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