On Monday, 4 September 2017 2:57:18 PM AEST Stefan Priebe - Profihost AG wrote: > > Then roughly make sure the complete set of metadata blocks fits in the > > cache. For an fs of this size let's say/estimate 150G. Then maybe same > > of double for data, so an SSD of 500G would be a first try. > > I would use 1TB devices for each Raid or a 4TB PCIe card. One thing I've considered is to create a filesystem with a RAID-1 of SSDs and then create lots of files with long names to use up a lot of space on the SSDs. Then delete those files and add disks to the filesystem. Then BTRFS should keep using the allocated metadata blocks on the SSD for all metadata and use disks for just data. I haven't yet tried bcache, but would prefer something simpler with one less layer. -- 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
