Documentation or support for IMSM caching ????

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Hi all, particularly friends from Intel....

Does anyone know anything about the caching support in IMSM soft-raid?

There are reports of mdadm complaining:

  mdadm: (IMSM): Unsupported attributes : 3000000

on some laptops - particularly an HP Spectre which has an SSD and Optane
memory.  Both devices has IMSM metadata, but mdadm cannot handle it.
Presumable the Optane is being used as a fast cache in front of the SSD.

If we had the specs we might be able to get mdadm to handle it.
Even better would be if Intel could provide some code :-)

https://bugzilla.suse.com/show_bug.cgi?id=1194355

NeilBrown



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