>>>>> "Zdenek" == Zdenek Kabelac <zkabelac@xxxxxxxxxx> 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 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel