【问题定位】设备强制断电重启后引起的磁盘I/O错误，并且无法读写 |
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背景：
设备正常运行阶段，做了电源硬性OFF->ON操作，设备启动后，发现磁盘分区无法读写。 过程描述：问题出现启动日志中磁盘I/O相关操作已经报异常： [ 3894.018424][ 26] EXT4-fs warning (device sda10): ext4_end_bio:323: I/O error 10 writing to inode 12324 (offset 0 size 0 starting block 342551) [ 3894.031145][ 26] Buffer I/O error on device sda10, logical block 54806 [ 3894.054810][ 26] print_req_error: I/O error, dev sda, sector 685098 [ 3894.061047][ 26] EXT4-fs warning (device sda10): ext4_end_bio:323: I/O error 10 writing to inode 12323 (offset 0 size 0 starting block 342550) [ 3894.073768][ 26] Buffer I/O error on device sda10, logical block 54805 [ 3894.080271][ 26] JBD2: Detected IO errors while flushing file data on sda10-8 [ 3894.104521][ 26] print_req_error: I/O error, dev sda, sector 576944 [ 3894.134412][ 26] print_req_error: I/O error, dev sdb, sector 3507621328 [ 3894.134416][ 26] EXT4-fs warning (device sdb5): ext4_end_bio:323: I/O error 10 writing to inode 109576257 (offset 0 size 4096 starting block 438452667) [ 3894.140131][ 26] print_req_error: I/O error, dev sda, sector 576550 [ 3894.146714][ 26] Buffer I/O error on device sdb5, logical block 438451386 [ 3894.160209][ 26] Buffer I/O error on dev sda10, logical block 531, lost sync page write [ 3894.171469][ 26] print_req_error: I/O error, dev sdb, sector 4966066328 [ 3894.171487][ 26] EXT4-fs error (device sdb5): ext4_read_inode_bitmap:199: comm MergeMutate: Cannot read inode bitmap - block_group = 18947, inode_bitmap = 620757011 [ 3894.171490][ 26] print_req_error: I/O error, dev sdb, sector 721430784 [ 3894.171499][ 26] print_req_error: I/O error, dev sdb, sector 3905818656 [ 3894.171502][ 26] Buffer I/O error on dev sdb5, logical block 488226052, lost sync page write [ 3894.171554][ 26] print_req_error: I/O error, dev sdb, sector 4966066328 [ 3894.171584][ 26] print_req_error: I/O error, dev sdb, sector 4966066328进入系统后，查看磁盘情况发现无显示，dmesg信息里出现大量错误信息： root@localhost:/# fdisk -l root@localhost:/# dmesg |tail [ 5491.208098][ 24] EXT4-fs error (device sdb5): __ext4_get_inode_loc:4730: inode #23855845: block 95420494: comm gbased: unable to read itable block [ 5491.208106][ 46] EXT4-fs error (device sdb5) in ext4_do_update_inode:5393: Journal has aborted [ 5491.208231][ 46] EXT4-fs error (device sdb5) in ext4_reserve_inode_write:5945: Journal has aborted [ 5491.208416][ 46] EXT4-fs error (device sdb5) in __ext4_new_inode:940: Journal has aborted [ 5491.208426][ 46] EXT4-fs error (device sdb5) in __ext4_new_inode:940: Journal has aborted [ 5491.255094][ 42] EXT4-fs error (device sdb5): ext4_journal_check_start:61: Detected aborted journal [ 5491.255482][ 41] EXT4-fs error (device sdb5) in __ext4_new_inode:940: Journal has aborted root@localhost:/[ 5491.255497][ 42] EXT4-fs error (device sdb5) in ext4_reserve_inode_write:5945: Journal has aborted # [ 5491.264101][ 41] EXT4-fs (sdb5): Remounting filesystem read-only [ 5491.317475][ 41] EXT4-fs error (device sda10): ext4_journal_check_start:61: Detected aborted journal [ 5491.317476][ 41] EXT4-fs (sda10): Remounting filesystem read-only root@localhost:/[ 5491.350394][ 41] EXT4-fs error (device sdb5): ext4_journal_check_start:61: Detected aborted journal # [ 5491.360789][ 25] EXT4-fs error (device sdb5): mpage_map_and_submit_extent:2607: comm kworker/u134:0: Failed to mark inode 155451465 dirty [ 5491.405774][ 42] EXT4-fs error (device sdb5) in ext4_do_update_inode:5393: Journal has aborted root@localhost:/[ 5491.414582][ 27] EXT4-fs error (device sdb5): __ext4_get_inode_loc:4730: inode #23855845: block 95420494: comm gbased: unable to read itable block使用df可以看到映射，但是无法进行读取操作。 复现验证：1.通过磁盘修复操作将磁盘修复正常，读写正常，命令参考：fsck.ext4 -a /dev/sdb？ 2.做了demo反复对磁盘读写操作中，对设备硬重启。 基于上述3次操作后，又复现了问题; PS：这里感觉还是跟磁盘品牌有关，因为设备上不止一个磁盘，其中出复现出来的依旧是同一个（没错，是个GC的！） 原因分析：这里只基于复测情况下进行的问题分析： a.磁盘在进行读写操作时，需要进行一系列的操作，如寻找磁头、读写磁道、校验数据等等，如果直接断电，磁盘无法正常完成这些操作，可能会导致数据损坏或磁盘损坏。 b.在进行文件写入操作时，数据通常首先被缓存在计算机的RAM中，然后再被写入磁盘，如果在这个过程中强制断电，这可能会导致磁盘上的文件和目录损坏，甚至可能无法访问。 查找资料有个说法： 硬件故障和写入数据丢失是导致磁盘无法访问的常见原因… |
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