On Sat, 14 Jan 2012 16:02:23 +0100 (GMT+01:00) lu...@plaintext.sk wrote: > I am using for my workspace btrfs filesystem on ssd disk. I do not thrust to > my ssd and I want to have backup of all data on rotational hdd (raid5 of 5 > disks). If I am not wrong, this can be done when I use btrfs on top of two > phycical media (one ssd and second md device). This I think would work fine. > > My question is, does btrfs recognize poor latency of md device and will > preform most reads from ssd? (I want to set raid1 for metadata and also to > data). (side question, should be ssd in parameters of mount?) > > PS: Is this crazy idea, or normal (planned) usecase?
Hello, This is not a crazy idea, and it's already possible in MD-based RAID. Run 'man md' and 'man mdadm' and do a search for 'write-mostly' to read more about it. However I don't think the same feature has been implemented in BTRFS yet. -- With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free."
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