在Hyper-V上安装Ubuntu时，磁盘变为只读

我正在尝试在基于Hyper-V Gen1的VM上的Windows Server 2012 R2上安装Ubuntu 12.04.5服务器（64位） . 安装将随机挂起， dmesg 最终会显示如下错误：

sd 2:0:0:0: rejecting I/O to offline device

我有一个非常相似的VM，一直工作正常 . 两个系统上的 dmesg 输出首先在启动后大约126秒发散（尽管这可能是因为它是安装程序启动，而不是标准启动）：

[  126.482972] NTFS driver 2.1.30 [Flags: R/O MODULE].
xor: measuring software checksum speed
   prefetch64-sse: 16009.000 MB/sec
   generic_sse: 15008.000 MB/sec
xor: using function: prefetch64-sse (16009.000 MB/sec)
raid6: sse2x1    9322 MB/s
raid6: sse2x2   11511 MB/s
raid6: sse2x4   13061 MB/s
raid6: using algorithm sse2x4 (13061 M/s)
raid6: using intx recovery algorithm
bio: create slab <bio-1> at 1
Btrfs loaded
JFS: nTxBlock = 7892, nTxLock = 63140
SGI XFS with ACLs, security attributes, realtime, large block/inode, numbers, no debug enabled
EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities
EXT4-fs (sda1): couldn't mount as ext2 due to feature incompatibilities
EXT4-fs (sda1): INFO: recovery required on readonly filesystem
EXT4-fs (sda1): write access unavailable, cannot proceed
EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities
EXT4-fs (sda1): couldn't mount as ext2 due to feature incompatibilities
EXT4-fs (sda1): INFO: recovery required on readonly filesystem
[  127.334559] EXT4-fs (sda1): write access unavailable, cannot proceed

过了一段时间，

[  182.830804] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: errors=remount-ro
[  230.779000] hv_storvsc vmbus_0_1: cmd 0x2a scsi status 0x2 srb status 0xa
               (repeated x times...)
[  241.151746] hv_storvsc vmbus_0_1: cmd 0x3 scsi status 0x2 srb status 0x8
               (also repeated x times)
[  251.155963] hv_storvsc vmbus_0_1: cmd 0x0 scsi status 0x2 srb status 0x8
[  251.155973] sd 2:0:0:0: Device offlined - not ready after error recovery
               (repeated x times again)
[  251.155987] sd 2:0:0:0: [sda] Unhandled error code
[  251.155988] sd 2:0:0:0: [sda]
[  251.155989] Result: hostbyte=DID_OK driverbyte=DRIVER_OK
[  251.155991] sd 2:0:0:0: [sda] CDB:
[  251.155992] Write(10): 2a 00 04 c1 09 00 00 00 08 00
[  251.155996] end_request: I/O error, dev sda, sector 79759616
[  251.155999] Buffer I/O error on device sda1, logical block 9969696
[  251.156000] lost page write due to I/O error on sda1
[  251.156011] sd 2:0:0:0: rejecting I/O to offline device

最终渗透到EXT4驱动程序 . 使用EXT3，会显示类似的错误消息，但驱动程序从不调用它退出，因此安装只会挂起 .

笔记：

类似的东西似乎发生在Windows Azure-based (cloud) VMs上 . 链接页面建议您停止并启动VM，这意味着将其移动到其他主机 .

This thread提到Hyper-V会在底层磁盘返回错误时停止I / O，并且此停顿会导致奇怪的行为 .

• VHDX磁盘映像位于Windows Storage Space设备（Microsoft RAID-ish技术）上 .

This thread表明它特定于将 storvsc 驱动程序与ext4文件系统一起使用，而不支持SCSI WRITE_SAME 命令 . 这将被检入Linux内核3.9-rc1，并且肯定包含在Ubuntu 12.04.5附带的Linux 3.13内核中 .