dmesg riporta:
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[44501.734031] sd 0:0:0:0: [sda] tag#4 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.734036] sd 0:0:0:0: [sda] tag#4 CDB: Write(10) 2a 00 12 c6 1a 40 00 25 c0 00
[44501.734038] blk_update_request: I/O error, dev sda, sector 314972736
[44501.734061] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308104)
[44501.734063] Buffer I/O error on device dm-3, logical block 39308104
[44501.734065] Buffer I/O error on device dm-3, logical block 39308105
[44501.734067] Buffer I/O error on device dm-3, logical block 39308106
[44501.734068] Buffer I/O error on device dm-3, logical block 39308107
[44501.734069] Buffer I/O error on device dm-3, logical block 39308108
[44501.734070] Buffer I/O error on device dm-3, logical block 39308109
[44501.734071] Buffer I/O error on device dm-3, logical block 39308110
[44501.734073] Buffer I/O error on device dm-3, logical block 39308111
[44501.734074] Buffer I/O error on device dm-3, logical block 39308112
[44501.734075] Buffer I/O error on device dm-3, logical block 39308113
[44501.734130] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308272)
[44501.734186] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308440)
[44501.734243] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308608)
[44501.734292] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308776)
[44501.734341] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39308944)
[44501.734390] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39309112)
[44501.734428] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39309280)
[44501.734442] sd 0:0:0:0: [sda] tag#3 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.734444] sd 0:0:0:0: [sda] tag#3 CDB: Write(10) 2a 00 12 c6 15 00 00 05 40 00
[44501.734445] blk_update_request: I/O error, dev sda, sector 314971392
[44501.734469] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 25165824 size 8388608 starting block 39307936)
[44501.734574] sd 0:0:0:0: [sda] tag#5 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.734576] sd 0:0:0:0: [sda] tag#5 CDB: Write(10) 2a 00 12 c6 80 00 00 32 80 00
[44501.734577] blk_update_request: I/O error, dev sda, sector 314998784
[44501.734593] EXT4-fs warning (device dm-3): ext4_end_bio:332: I/O error -5 writing to inode 9699593 (offset 33554432 size 6619136 starting block 39311360)
[44501.735479] sd 0:0:0:0: [sda] tag#6 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.735482] sd 0:0:0:0: [sda] tag#6 CDB: Write(10) 2a 00 12 c1 7a 08 00 03 c8 00
[44501.735484] blk_update_request: I/O error, dev sda, sector 314669576
[44501.735572] sd 0:0:0:0: [sda] tag#7 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.735574] sd 0:0:0:0: [sda] tag#7 CDB: Write(10) 2a 00 07 8f c6 30 00 02 60 00
[44501.735575] blk_update_request: I/O error, dev sda, sector 126862896
[44501.735613] sd 0:0:0:0: [sda] tag#8 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[44501.735615] sd 0:0:0:0: [sda] tag#8 CDB: Write(10) 2a 00 09 4f 07 70 00 00 c0 00
[44501.735615] blk_update_request: I/O error, dev sda, sector 156174192
[44501.735772] Aborting journal on device dm-3-8.
[44501.735797] EXT4-fs error (device dm-3) in __ext4_new_inode:863: Journal has aborted
[44503.317111] JBD2: Spotted dirty metadata buffer (dev = dm-3, blocknr = 0). There's a risk of filesystem corruption in case of system crash.
[44503.325343] EXT4-fs (dm-3): Delayed block allocation failed for inode 3932213 at logical offset 7 with max blocks 1 with error 30
[44503.325360] EXT4-fs (dm-3): This should not happen!! Data will be lost
[44503.325363] EXT4-fs error (device dm-3) in ext4_writepages:2520: Journal has aborted
[44503.860623] EXT4-fs (dm-3): Remounting filesystem read-only
[44503.957597] EXT4-fs error (device dm-3): ext4_journal_check_start:56: Detected aborted journal
[44503.957602] EXT4-fs error (device dm-3): ext4_journal_check_start:56: Detected aborted journal
[44503.957609] EXT4-fs error (device dm-3): ext4_journal_check_start:56: Detected aborted journal
[44503.958486] EXT4-fs error (device dm-3): ext4_journal_check_start:56: Detected aborted journal
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echo test > /boot/prova
sync
cat /boot/prova
test
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echo test > /prova
bash: /prova: File system in sola lettura
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mount -o remount,rw /
mount: cannot remount /dev/mapper/ubuntu--vg-root read-write, is write-protected
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swapoff /dev/mapper/ubuntu--vg-swap_1
dd if=/dev/zero of=/dev/mapper/ubuntu--vg-swap_1
^C41713+0 record dentro
41713+0 record fuori
21357056 byte (21 MB) copiati, 2,36102 s, 9,0 MB/s
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yes "pattern" > /dev/mapper/ubuntu--vg-swap_1
head /dev/mapper/ubuntu--vg-swap_1
pattern
pattern
pattern
pattern
pattern
pattern
pattern
pattern
pattern
pattern
aggiungo che il test sul volume logico contenente la swap mostra che il gruppo di volumi lvm NON è in sola lettura, e nemmeno quello contenente / appare essere in sola lettura, per quanto mount riporti il contrario:
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lvdisplay ubuntu-vg/root
--- Logical volume ---
LV Path /dev/ubuntu-vg/root
LV Name root
VG Name ubuntu-vg
LV UUID YqFEdA-nOxw-dAqI-aQ9X-K7YZ-Os2w-gohNp2
LV Write Access read/write
LV Creation host, time ubuntu, 2015-09-27 11:41:26 +0200
LV Status available
# open 1
LV Size 151,75 GiB
Current LE 38849
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:3