On Tuesday 21 Mar 2017 22:50:04 Kai Krakow wrote: ---<8
> I'm combining this with bcache. That's a cache between kernel and > filesystem that you put on SSD. Apparently, it requires repartitioning > to map your filesystem through bcache (it has to add a protective > superblock in front of your FS). So, a small SSD + bcache can make your > complete 500GB spinning rust act mostly like SSD perfomance-wise. > > I think there's a script that can move your FS 8 kB forward on HDD to > add that bcache superblock. But I wouldn't try that without backup and > some spare time. But it is a performance wonder. > > Using 3x 1TB btrfs RAID + 500GB bcache here. The system feels like an > SSD system but I don't have to decide what to put on a small SSD and > what to put on big slow storage. Is just automagic. ;-) You have me thinking now. I have a couple of spare 1TB SSDs here, and my workstation is a 12-core i7 running on a 256GB NVMe drive with 32 GB RAM. Maybe I should put the SSDs into a RAID-1 to contain the system (the same as they were in the old, now defunct box), then use the NVMe for bcache. What do you think of that idea? I'm not desperately short of space, but I've none spare either. The workstation's full time is spent running physics BOINC projects. That's all other than the usual desktop tasks. -- Regards Peter
