[dm-devel] mirrored device with thousand of mappingtableentries

[Martin K. Petersen]

>>>>> "Zdenek" == Zdenek Kabelac <zkabelac at redhat.com> writes:

Zdenek> If you really need that many devices - be also sure you have
Zdenek> disabled this kernel config option:

Zdenek> CONFIG_BLK_DEV_INTEGRITY

Zdenek> For some reason it consumes massive amount of memory.  Other
Zdenek> than that - you should count with 64KB per device usually.

Care to qualify that?

Unless your HBA indicates that it supports data integrity the only
penalty should be that each bio grows a pointer.

-- 
Martin K. Petersen	Oracle Linux Engineering