537650f54d
New ZFS property volmode and sysctl vfs.zfs.vol.mode allow switching ZVOL between three modes: geom -- existing fully functional behavior (default); dev -- exposing volumes only as raw disk device file in devfs; none -- not exposing volumes outside ZFS. The "dev" mode is less functional (can't be partitioned, mounted, etc), but it is faster, and in some scenarios with untrusted consumers safer. It can be useful for NAS, VM block storages, etc. The "none" mode may be convenient for backup servers, etc. that don't need direct data access. Due to the way ZVOL is integrated with main ZFS code, those property and sysctl are checked only during pool import and volume creation. MFC after: 1 month Sponsored by: iXsystems, Inc. |
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