I have a RAID6 array consisting of 10x2TB drives that I will be using as a NAS device. The server enclosure has 6 additional bays that I may use for future expansion. The storage will all be 500G-1T sparse files served up as iSCSI disks to various servers, with the disk images residing on an XFS partition.
My question is: given this setup, is it more efficient to install the XFS partition directly on the /dev/md device? I would prefer to create a volume group, and use LVM to manage the space, but not if is going to incur much of a performance penalty.
Thinking forward to eventually creating a second RAID array with the additional 6 slots, adding that to the volume group would be fairly trivial if I started out with LVM, but can you have an XFS filesystem run on two different devices without putting it on LVM to begin with? Two separate XFS mounts, while not ideal would probably work, but again only if there is some performance boost to compensate.