-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 12/30/2014 06:17 PM, ashf...@whisperpc.com wrote: > I believe that someone who understands the code in depth (and that > may also be one of the people above) determine exactly how BTRFS > implements RAID-10.
I am such a person. I had a similar question a year or two ago ( specifically about raid10 ) so I both experimented and read the code myself to find out. I was disappointed to find that it won't do raid10 on 3 disks since the chunk metadata describes raid10 as a stripe layered on top of a mirror. Jose's point was also a good one though; one chunk may decide to mirror disks A and B, so a failure of A and C it could recover from, but a different chunk could choose to mirror on disks A and C, so that chunk would be lost if A and C fail. It would probably be nice if the chunk allocator tried to be more deterministic about that. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCgAGBQJUo2M8AAoJENRVrw2cjl5RihoH/1ulWpEK6lPaYhBSBbmWQyGu obJZBTbeMgBAfO9VMq9X2laUfmEprwYi8FuKnCwVgA1KyftFsaJngckqMoTtpwdI IXx2X2++MjZBkFBUFRhGlSQcbDgeB/RbBx+Vtxi2dNq3/WgZyHRfIJT1moRrxY0V UTH1kI7JsWg4blpdm+xW4o7UKds7JKHr5Th1PUH9SmJOdsBe2efIFQyC7hyuSQs0 gBUQzxmo3HcRzBtJwJjKRICU16VBN0NW7w3m/y6K1yIlkGi4U7MZgzMSUJw/BiMT tGX48AhBH3D3R2sjmF2aO5suPaHEVYoZuqhKevKZfTGS7izSYA74LqrGHkq5QBk= =ESya -----END PGP SIGNATURE----- -- 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
