-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02/27/2014 11:38 PM, Dave Chinner wrote: > On Thu, Feb 27, 2014 at 04:07:06PM -0500, Josef Bacik wrote: >> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> >> On 02/27/2014 04:05 PM, Chris Murphy wrote: >>> User reports successfully formatting and using an ~18TB Btrfs >>> volume on hardware raid5 using i686 kernel for over a year, >>> and then suddenly the file system starts behaving weirdly: >>> >>> https://urldefense.proofpoint.com/v1/url?u=http://www.mail-archive.com/linux-btrfs%40vger.kernel.org/msg31856.html&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=6eUt5RgBggFh930oFrH19iR4z%2BFVzT%2F0%2F4dYPt3g48U%3D%0A&s=5ac126734d7fa1d3238ab09a2ddc021a8dcc8fff7b022560a4d068be2de37c00 >>> >>> >>> >>> >>> I think this is due to the kernel page cache address space being >>> 16TB limited on 32-bit kernels, as mentioned by Dave Chinner >>> in this thread: >>> >>> https://urldefense.proofpoint.com/v1/url?u=http://oss.sgi.com/pipermail/xfs/2014-February/034588.html&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=6eUt5RgBggFh930oFrH19iR4z%2BFVzT%2F0%2F4dYPt3g48U%3D%0A&s=3e45f9288e6a77bc1a24dded368802c2ab46b812bf59953f74d4ee1d4141f7d2 >>> >>> >>> So it sounds like it shouldn't be possible to mount a Btrfs volume >>> larger than 16TB on 32-bit kernels. This is consistent with >>> ext4 and XFS which refuse to mount large file systems. >>> >>> >> >> Well that's not good, I'll fix this up. Thanks, > > Well, don't go assuming there's a problem just because I made an > off-hand comment. i.e my comment was simply "maybe it hasn't been > tested", and not an assertion that there is a bug or a problem.... > If I can't take your word as gospel then my whole life has been a lie! I'll look into it some more then but I seem to remember this being a real problem, like we'd wrap around in pagecache once we went above 16tb, which would cause problems for metadata since our btree inode is mapped logically to the entire fs. Thanks, Josef -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJTEImAAAoJEANb+wAKly3BtrwP/jChKmHL74UNkeKytwRtbKn9 MxudB5MxzaAzYcXpwVXOxhDAYy870htbzyePddhEjMCubY5Hnb10klGx3QztxV1z G7qnoJp0FchpLSMSAhQE0B8steRTPbawKBIYqb1Kj7p39j+HmQ4K6fafcajtA929 rgFcNIa61rTjurknI9N9Lf2palReycl1Ee3psiH+mXN+RvPBAZ13sFp1sVJWJvoE qHDB0g1vC47MbsvrADMeI/W6MUS8hXaZ31xS5PVOBTQiabH2ycw2853fAJsVdSsZ 0oh4E8AwnWf5+/V0wqFXFE0zMoEpWOc5JScbWMB1kZYQbBLCWUue5olLoPyOv2M6 WUS89IpTrspQ80KvWIGN1Bg4p7BAJ2h74zWWrEyGLtt3ujoKffcycGI19i7ln9cq glLf8ofCiOCGs5VSTQMdSl6Eu0XYPQQViq0autpcBhkit0DV7A/caK+b351+t3c7 SI+Xx8LsvUVVATo11nSI/Z9lRol/XEX08G2XrDI+YiSOaW1qjDueNDBrpai/8gRt dN8qbooDPArf82maNfCXsuEkKQIvkICxhRc3BWFvKeS/UTw5T9Y20UWAwanJfRfD bLE357shUKimRtunr0MplQU9GVyCD/0tTtm3BPzOcWlG5QX7fugAobJPRqpQTD6b d6PAQswquwuEfcqr38nk =+lP6 -----END PGP SIGNATURE----- -- 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
