On 18.01.2022 03:57, NeilBrown wrote: > > 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 Hi Neil, I think that this is Intel SRT, or some derivative of it. Dan Williams did provide code to enable SRT in kernel and mdadm years ago but it seems that it did not get past the RFC stage: https://lore.kernel.org/linux-raid/20140424061756.3187.2633.stgit@xxxxxxxxxxxxxxxxxx/ https://lore.kernel.org/linux-raid/20140424071902.4515.19684.stgit@xxxxxxxxxxxxxxxxxx/ Regards, Artur
