On Tuesday May 22, [EMAIL PROTECTED] wrote:
> Greetings all-
> 
> Quick question.  We've got one of these new Sun x4500's, it is basically 
> a machine with 48 disks in it, no hardware RAID controller, so you have 
> to use software RAID, in our case mdadm because we're running RHEL 4.4.
> 
> When we try to create the raid set (RAID6), we're getting an error: 
> "Invalid number of devices" (47 devices).  We tried lowering the number, 
> and eventually it worked when we brought the number down to 27.  But 
> looking at the source code, it looks like it supports up to 256 devices 
> for RAID6... ?  Any insight would be much appreciated!!

Use "--metadata=1" to mdadm.  The 0.90 superblock has a limit of 27
devices. version 1 has no fixed limit, but the code might not support
more than 384 very well.

> 
> Thanks a million,

That would be a megathank :-?

NeilBrown
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