Arkadiusz> 4.3.0 kernel, raid6 array: I think there's a bug in the 4.3.x and 4.4-rc3 and lower with block merges. I ran into these over the weekend, where v4.2.6 was stable, but anything higher would lock up and crash on me. So first step would be to make sure you get and test v4.4-rc4. Arkadiusz> md7 : active raid6 sdg[10] sdad1[9] sdac1[8] sdag1[7] sdaf1[6] sdae1[5] sdaj1[4] sdai1[3] sdah1[2] sdn1[1] Arkadiusz> 31255089152 blocks super 1.2 level 6, 512k chunk, algorithm 2 [10/10] [UUUUUUUUUU] Arkadiusz> bitmap: 1/30 pages [4KB], 65536KB chunk Arkadiusz> array had weird failure where many disks went into failed state but Arkadiusz> remove && adding these disks "fixed" it (turns out not really fixed it). Arkadiusz> Unfortunately now some reads fail: Arkadiusz> pread(4, 0x1483a00, 4096, 16003680464896) = -1 EIO (Input/output error) Arkadiusz> To reproduce used xfs_io Arkadiusz> xfs_io -d -c "pread 16003680464896 4096" /dev/md7 Arkadiusz> pread64: Input/output error Arkadiusz> which does pread exactly as shown above. Arkadiusz> write also fails for that area: Arkadiusz> xfs_io -d -c "pwrite 16003680464896 4096" /dev/md7 Arkadiusz> pwrite64: Input/output error Arkadiusz> Note that nothing is written in dmesg when that happens. Arkadiusz> I've tried various offsets and sizes of pread and at some point that was logged: Arkadiusz> [ 848.988518] Buffer I/O error on dev md7, logical block 3907148544, async page read Arkadiusz> but no error from underlying devices. Arkadiusz> List of bad blocks: Arkadiusz> http://sprunge.us/XSWI Arkadiusz> What can I do now? Arkadiusz> (loosing data from that few sectors is acceptable if the rest will be readable) Arkadiusz> Thanks, Arkadiusz> -- Arkadiusz> Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org ) Arkadiusz> -- Arkadiusz> To unsubscribe from this list: send the line "unsubscribe linux-raid" in Arkadiusz> the body of a message to majordomo@xxxxxxxxxxxxxxx Arkadiusz> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
