Hi, is there any project or plans to integrate a readcache in qemu either for iscsi or for the whole block layer?
I was thinking of 2 options: a) assign (up to) a fixed amount of ram for readcaching of a VMs disk I/O. Without SG_IO this seems to be quite easy as there are only a handful of operations to intercept. b) add SSDs to a Node and allow a VM to use up to X MB of that SSD as read-cache. This should still be a benefit if the storage for the VMs is on a NAS. I would like to do that independent of the OS for 2 reasons. First with iSCSI the OS is not involved. And second I would like to be able to add a memory limit for the cache. Peter
