On Sat, 29 Jun 2013, Martin <m_bt...@ml1.co.uk> wrote: > Mmmm... I'm not sure trying to balance historical read/write counts is > the way to go... What happens for the use case of an SSD paired up with > a HDD? (For example an SSD and a similarly sized Raptor or enterprise > SCSI?...) Or even just JBODs of a mishmash of different speeds? > > Rather than trying to balance io counts, can a realtime utilisation > check be made and go for the least busy?
It would also be nice to be able to tune this. For example I've got a RAID-1 array that's mounted noatime, hardly ever written, and accessed via NFS on 100baseT. It would be nice if one disk could be spun down for most of the time and save 7W of system power. Something like the --write-mostly option of mdadm would be good here. Also it should be possible for a RAID-1 array to allow faster reads for a single process reading a single file if the file in question is fragmented. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
