I am running Debian 7.8 (wheezy) which is installed on a Windows Hyper-V server (not managed by me). However, the server frequently goes into 'read only' mode and I am not sure why. I have looked in dmesg but, to be honest, I do not know what I am looking at or for. I ran fsck after reboot and there were errors e.g.
fsck died with exit status 4 ... Inotes that were part of a corrupted orphan linked list found. Fix Inode <number> was part of the orphaned inode list. FIXED ... Block bitmap differences: .... Free blocks count wrong for group ...
After the reboot everything is ok.
Here is the output from dmesg after I ran fsck:
[ 5.951324] scsi scan: INQUIRY result too short (5), using 36 [ 5.951735] scsi scan: INQUIRY result too short (5), using 36 [ 5.951933] input: Microsoft Vmbus HID-compliant Mouse as /devices/virtual/input/input1 [ 5.952228] hid 0006:045E:0621.0001: input: <UNKNOWN> HID v0.01 Mouse [Microsoft Vmbus HID-compliant Mouse] on [ 5.953338] hv_netvsc: hv_netvsc channel opened successfully [ 6.057589] hv_netvsc vmbus_0_14: Device MAC 00:15:5d:00:fa:01 link state up [ 10.954244] sd 2:0:0:0: [sda] 1006632960 512-byte logical blocks: (515 GB/480 GiB) [ 10.954325] sd 2:0:0:0: [sda] Write Protect is off [ 10.954330] sd 2:0:0:0: [sda] Mode Sense: 0f 00 00 00 [ 10.954539] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 10.956129] sda: sda1 sda2 < sda5 > [ 10.957221] sd 2:0:0:0: [sda] Attached SCSI disk [ 11.311017] PM: Starting manual resume from disk [ 11.311022] PM: Hibernation image partition 8:5 present [ 11.311024] PM: Looking for hibernation image. [ 11.311494] PM: Image not found (code -22) [ 11.311497] PM: Hibernation image not present or could not be loaded. [ 11.404052] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) [ 12.562030] udevd: starting version 175 [ 12.959687] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input2 [ 12.959696] ACPI: Power Button [PWRF] [ 12.977694] hv_utils: Registering HyperV Utility Driver [ 12.977698] hv_vmbus: registering driver hv_util [ 13.080426] piix4_smbus 0000:00:07.3: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr [ 13.083881] input: PC Speaker as /devices/platform/pcspkr/input/input3 [ 13.170434] alg: No test for __gcm-aes-aesni (__driver-gcm-aes-aesni) [ 13.507475] trackpoint.c: failed to get extended button data [ 16.708356] IBM TrackPoint firmware: 0x01, buttons: 0/0 [ 16.710497] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/input/input4 [ 19.075083] Adding 16773116k swap on /dev/sda5. Priority:-1 extents:1 across:16773116k [ 19.099050] EXT4-fs (sda1): re-mounted. Opts: (null) [ 19.335774] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro [ 19.412413] loop: module loaded [ 20.685798] RPC: Registered named UNIX socket transport module. [ 20.685802] RPC: Registered udp transport module. [ 20.685811] RPC: Registered tcp transport module. [ 20.685813] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 20.721997] FS-Cache: Loaded [ 20.754261] FS-Cache: Netfs 'nfs' registered for caching [ 20.763161] Installing knfsd (copyright (C) 1996 email@example.com). [ 23.477630] Bluetooth: Core ver 2.16 [ 23.477651] NET: Registered protocol family 31 [ 23.477653] Bluetooth: HCI device and connection manager initialized [ 23.477656] Bluetooth: HCI socket layer initialized [ 23.477658] Bluetooth: L2CAP socket layer initialized [ 23.477849] Bluetooth: SCO socket layer initialized [ 23.488920] Bluetooth: RFCOMM TTY layer initialized [ 23.488926] Bluetooth: RFCOMM socket layer initialized [ 23.488928] Bluetooth: RFCOMM ver 1.11 [ 23.496819] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 23.496822] Bluetooth: BNEP filters: protocol multicast [ 28.716625] postgres (3298): /proc/3298/oom_adj is deprecated, please use /proc/3298/oom_score_adj instead. [ 41.096759] mtrr: type mismatch for f8000000,400000 old: write-back new: write-combining [ 56.353460] hv_storvsc vmbus_0_1: cmd 0x85 scsi status 0x2 srb status 0x86 [ 56.353465] hv_storvsc vmbus_0_1: stor pkt ffff8801fbb0e2c0 autosense data valid - len 18 [ 56.353468] storvsc: Sense Key : Illegal Request [current] [ 56.353472] storvsc: Add. Sense: Invalid command operation code
Any pointers to log files that I could look in would be greatly appreciated.