Re: [libvirt] libvirt and Parallels Cloud Storage

Hi! I'd like to develop libvirt integration with Parallels Cloud Storage (Pstorage) which is a new distributed file system from Parallels designed specifically for storing VM images: http://www.parallels.com/products/pcs/cloud-storage/

It's not a POSIX FS but there is a FUSE client for it that can be used to access and manipulate images. It's quite high speed but only when used with O_DIRECT + aio. I tried to setup several KVMs on top of a Pstorage mount using virt-manager. It worked good, but I had to: 1. tune cache and IO settings for every disk 2. disable space allocation by libvirt because it is using sync IO and is therefore slow I tried to find ways to solve the first issue and IMHO this can be done by adding a way to specify per-pool defaults for cache and IO settings. I didn't find any way for this in the current code and UI. I'd like to add a new storage backend also that will be a 'dir' backend with extra ability to manage Pstorage mount points and UI integration. I'd like to merge my work to the main tree when it's finished if possible.