Re: Question: raid1 behaviour on failure

Thu, 21 Apr 2016 04:59:41 -0700 


On 04/21/2016 03:45 PM, Satoru Takeuchi wrote:

On 2016/04/21 15:23, Satoru Takeuchi wrote:

On 2016/04/20 14:17, Matthias Bodenbinder wrote:

Am 18.04.2016 um 09:22 schrieb Qu Wenruo:

BTW, it would be better to post the dmesg for better debug.


So here we. I did the same test again. Here is a full log of what i
did. It seems to be mean like a bug in btrfs.
Sequenz of events:
1. mount the raid1 (2 disc with different size)
2. unplug the biggest drive (hotplug)
3. try to copy something to the degraded raid1
4. plugin the device again (hotplug)

This scenario does not work. The disc array is NOT redundant! I can
not work with it while a drive is missing and I can not reattach the
device so that everything works again.

The btrfs module crashes during the test.

I am using LMDE2 with backports:
btrfs-tools 4.4-1~bpo8+1
linux-image-4.4.0-0.bpo.1-amd64

Matthias


rakete - root - /root
1# mount /mnt/raid1/

Journal:

Apr 20 07:01:16 rakete kernel: BTRFS info (device sdi): enabling auto
defrag
Apr 20 07:01:16 rakete kernel: BTRFS info (device sdi): disk space
caching is enabled
Apr 20 07:01:16 rakete kernel: BTRFS: has skinny extents

rakete - root - /mnt/raid1
3# ll
insgesamt 0
drwxrwxr-x 1 root root   36 Nov 14  2014 AfterShot2(64-bit)
drwxrwxr-x 1 root root 5082 Apr 17 09:06 etc
drwxr-xr-x 1 root root  108 Mär 24 07:31 var

4# btrfs fi show
Label: none  uuid: 16d5891f-5d52-4b29-8591-588ddf11e73d
    Total devices 3 FS bytes used 1.60GiB
    devid    1 size 698.64GiB used 3.03GiB path /dev/sdg
    devid    2 size 465.76GiB used 3.03GiB path /dev/sdh
    devid    3 size 232.88GiB used 0.00B path /dev/sdi

####
unplug device sdg:

Apr 20 07:03:05 rakete kernel: Buffer I/O error on dev sdf1, logical
block 243826688, lost sync page write
Apr 20 07:03:05 rakete kernel: JBD2: Error -5 detected when updating
journal superblock for sdf1-8.
Apr 20 07:03:05 rakete kernel: Aborting journal on device sdf1-8.
Apr 20 07:03:05 rakete kernel: Buffer I/O error on dev sdf1, logical
block 243826688, lost sync page write
Apr 20 07:03:05 rakete kernel: JBD2: Error -5 detected when updating
journal superblock for sdf1-8.
Apr 20 07:03:05 rakete umount[16405]: umount: /mnt/raid1: target is busy
Apr 20 07:03:05 rakete umount[16405]: (In some cases useful info
about processes that
Apr 20 07:03:05 rakete umount[16405]: use the device is found by
lsof(8) or fuser(1).)
Apr 20 07:03:05 rakete systemd[1]: mnt-raid1.mount mount process
exited, code=exited status=32
Apr 20 07:03:05 rakete systemd[1]: Failed unmounting /mnt/raid1.
Apr 20 07:03:24 rakete kernel: usb 3-1: new SuperSpeed USB device
number 3 using xhci_hcd
Apr 20 07:03:24 rakete kernel: usb 3-1: New USB device found,
idVendor=152d, idProduct=0567
Apr 20 07:03:24 rakete kernel: usb 3-1: New USB device strings:
Mfr=10, Product=11, SerialNumber=5
Apr 20 07:03:24 rakete kernel: usb 3-1: Product: USB to ATA/ATAPI Bridge
Apr 20 07:03:24 rakete kernel: usb 3-1: Manufacturer: JMicron
Apr 20 07:03:24 rakete kernel: usb 3-1: SerialNumber: 152D00539000
Apr 20 07:03:24 rakete kernel: usb-storage 3-1:1.0: USB Mass Storage
device detected
Apr 20 07:03:24 rakete kernel: usb-storage 3-1:1.0: Quirks match for
vid 152d pid 0567: 5000000
Apr 20 07:03:24 rakete kernel: scsi host9: usb-storage 3-1:1.0
Apr 20 07:03:24 rakete mtp-probe[16424]: checking bus 3, device 3:
"/sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/usb3/3-1"
Apr 20 07:03:24 rakete mtp-probe[16424]: bus: 3, device: 3 was not an
MTP device
Apr 20 07:03:25 rakete kernel: scsi 9:0:0:0: Direct-Access     WDC
WD20 02FAEX-007BA0    0125 PQ: 0 ANSI: 6
Apr 20 07:03:25 rakete kernel: scsi 9:0:0:1: Direct-Access     WDC
WD50 01AALS-00L3B2    0125 PQ: 0 ANSI: 6
Apr 20 07:03:25 rakete kernel: scsi 9:0:0:2: Direct-Access
SAMSUNG  SP2504C          0125 PQ: 0 ANSI: 6
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: Attached scsi generic sg6
type 0
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: Attached scsi generic sg7
type 0
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] 3907029168 512-byte
logical blocks: (2.00 TB/1.82 TiB)
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] Write Protect is off
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] Mode Sense: 67 00 10 08
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: Attached scsi generic sg8
type 0
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] 976773168 512-byte
logical blocks: (500 GB/466 GiB)
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] No Caching mode page
found
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] Assuming drive
cache: write through
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] Write Protect is off
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] Mode Sense: 67 00 10 08
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] 488395055 512-byte
logical blocks: (250 GB/233 GiB)
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] No Caching mode page
found
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] Assuming drive
cache: write through
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] Write Protect is off
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] Mode Sense: 67 00 10 08
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] No Caching mode page
found
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] Assuming drive
cache: write through
Apr 20 07:03:25 rakete kernel:  sdf: sdf1
Apr 20 07:03:25 rakete kernel: sd 9:0:0:0: [sdf] Attached SCSI disk
Apr 20 07:03:25 rakete kernel: sd 9:0:0:1: [sdj] Attached SCSI disk
Apr 20 07:03:25 rakete kernel: sd 9:0:0:2: [sdk] Attached SCSI disk
Apr 20 07:03:25 rakete kernel: EXT4-fs (sdf1): recovery complete
Apr 20 07:03:25 rakete kernel: EXT4-fs (sdf1): mounted filesystem
with ordered data mode. Opts: (null)
Apr 20 07:03:25 rakete udisksd[3671]: Error statting /dev/sdg: No
such file or directory


####
5# btrfs fi show
Label: none  uuid: 16d5891f-5d52-4b29-8591-588ddf11e73d
    Total devices 3 FS bytes used 1.60GiB
    devid    2 size 465.76GiB used 3.03GiB path /dev/sdj
    devid    3 size 232.88GiB used 0.00B path /dev/sdk
    *** Some devices missing
####


Here the names of *online* devices are changed
(/dev/sdh => /dev/sdj, /dev/sdi => /dev/sdk) after just
offlining a device (/dev/sdf). It's odd regardless of
whether Btrfs works fine or not.

Can anyone explain this behavior?


FYI,

I tried to reproduce this problem on VM.
Here USB storages are /dev/sd{a,b,c}.

Step to reproduce:

  1. create a fs on /dev/sd{a,b,c}
  2. mount this fs
  3. Surprise unplug /dev/sdc
  4. Write to this fs till ENOSPC happens

Then, although there are I/O errors about /dev/sdc,
device names didn't change and ro remount didn't happen.

command log:
=================================
# mkfs.btrfs -f -m raid1 -d raid1 /dev/sd{a,b,c}
btrfs-progs v4.5.1-41-g8202204-dirty
See http://btrfs.wiki.kernel.org for more information.

Label:              (null)
UUID:               16a54915-c807-42cf-8365-82c0780c5ab5
Node size:          16384
Sector size:        4096
Filesystem size:    15.00GiB
Block group profiles:
   Data:             RAID1             1.01GiB
   Metadata:         RAID1             1.01GiB
   System:           RAID1            12.00MiB
SSD detected:       no
Incompat features:  extref, skinny-metadata
Number of devices:  3
Devices:
    ID        SIZE  PATH
     1     5.00GiB  /dev/sda
     2     5.00GiB  /dev/sdb
     3     5.00GiB  /dev/sdc

# mount /dev/sda /scratch_mnt/
# btrfs fi show /scratch_mnt/
Label: none  uuid: 16a54915-c807-42cf-8365-82c0780c5ab5
         Total devices 3 FS bytes used 640.00KiB
         devid    1 size 5.00GiB used 2.00GiB path /dev/sda
         devid    2 size 5.00GiB used 1.01GiB path /dev/sdb
         devid    3 size 5.00GiB used 1.01GiB path /dev/sdc

#
# # *** surprise unplug happens here ***
#
# btrfs fi show /scratch_mnt/


Would you please post the output of "btrfs-debug-tree -t 3"?


I guess the case would be that, there is not raid1 stripe in device 3, 
so all data/metadata allocation/cow happens without problem.

"btrfs-debug-tree -t 3" output would verify my guess.

Thanks,
Qu

Label: none  uuid: 16a54915-c807-42cf-8365-82c0780c5ab5
         Total devices 3 FS bytes used 1.81GiB
         devid    1 size 5.00GiB used 2.00GiB path /dev/sda
         devid    2 size 5.00GiB used 2.01GiB path /dev/sdb
         *** Some devices missing

# cp -a linux /scratch_mnt/
# cp -a linux /scratch_mnt/linux.2
# cp -a linux /scratch_mnt/linux.3
cp: error writing ‘/scratch_mnt/linux.3/drivers/scsi/lpfc/lpfc_els.c’:
No space left on device
...
# mount | grep scratch
/dev/sda on /scratch_mnt type btrfs
(rw,relatime,seclabel,space_cache,subvolid=5,subvol=/)
# dmesg | tail
[ 1400.778705] BTRFS warning (device sdc): lost page write due to IO
error on /dev/sdc
[ 1438.604796] btrfs_dev_stat_print_on_error: 174 callbacks suppressed
[ 1438.604803] BTRFS error (device sdc): bdev /dev/sdc errs: wr 125633,
rd 1, flush 276, corrupt 0, gen 0
[ 1438.609782] BTRFS error (device sdc): bdev /dev/sdc errs: wr 125634,
rd 1, flush 276, corrupt 0, gen 0
[ 1438.613331] BTRFS error (device sdc): bdev /dev/sdc errs: wr 125634,
rd 1, flush 277, corrupt 0, gen 0
[ 1438.669090] btrfs_end_buffer_write_sync: 52 callbacks suppressed
[ 1438.669095] BTRFS warning (device sdc): lost page write due to IO
error on /dev/sdc
[ 1438.669098] BTRFS error (device sdc): bdev /dev/sdc errs: wr 125635,
rd 1, flush 277, corrupt 0, gen 0
[ 1438.672621] BTRFS warning (device sdc): lost page write due to IO
error on /dev/sdc
[ 1438.672626] BTRFS error (device sdc): bdev /dev/sdc errs: wr 125636,
rd 1, flush 277, corrupt 0, gen 0
=================================

Thanks,
Satoru



Thanks,
Satoru


still mounted in rw mode:
/dev/sdg on /mnt/raid1 type btrfs
(rw,noatime,space_cache,autodefrag,subvolid=5,subvol=/)
####
7# cp -r /root/ .
cp: das Verzeichnis „./root“ kann nicht angelegt werden:
Eingabe-/Ausgabefehler
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 1, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 2, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 3, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 4, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 5, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 6, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 7, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 8, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 9, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): bdev
/dev/sdg errs: wr 0, rd 10, flush 0, corrupt 0, gen 0
Apr 20 07:05:37 rakete kernel: BTRFS error (device sdi): error
reading free space cache
Apr 20 07:05:37 rakete kernel: BTRFS warning (device sdi): failed to
load free space cache for block group 20497563648, rebuilding it now
Apr 20 07:05:37 rakete kernel: ------------[ cut here ]------------
Apr 20 07:05:37 rakete kernel: WARNING: CPU: 7 PID: 16738 at
/build/linux-H3jpF0/linux-4.4.6/fs/btrfs/ctree.c:1156
__btrfs_cow_block+0x56f/0x5e0 [btrfs]()
Apr 20 07:05:37 rakete kernel: BTRFS: Transaction aborted (error -5)
Apr 20 07:05:37 rakete kernel: Modules linked in: uas usb_storage
pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) binfmt_misc dvb_ttpci
saa7146_vv ttpci_eeprom saa7146 videobuf_dma_sg videobuf_core
dvb_core v4l2_common videodev media cfg80211 vboxdrv(O)
cpufreq_powersave cpufreq_conservative cpufreq_userspace
cpufreq_stats snd_hda_codec_hdmi intel_rapl iosf_mbi
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
irqbypass crct10dif_pclmul crc32_pclmul eeepc_wmi asus_wmi joydev
sparse_keymap drbg iTCO_wdt iTCO_vendor_support snd_hda_codec_realtek
rfkill ansi_cprng snd_hda_codec_generic nvidia(PO) aesni_intel
aes_x86_64 lrw gf128mul snd_hda_intel glue_helper ablk_helper
snd_hda_codec cryptd snd_hda_core serio_raw pcspkr snd_hwdep snd_pcm
i2c_i801 snd_timer snd lpc_ich soundcore 8250_fintek mei_me shpchp mei
Apr 20 07:05:37 rakete kernel:  mfd_core battery tpm_tis tpm evdev
processor drm fuse ecryptfs cbc sha256_ssse3 sha256_generic hmac
encrypted_keys parport_pc ppdev lp parport autofs4 ext4 crc16 mbcache
jbd2 btrfs raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor hid_generic usbhid hid raid6_pq libcrc32c crc32c_generic
md_mod dm_mirror dm_region_hash dm_log dm_mod sr_mod sg cdrom sd_mod
ata_generic ahci libahci pata_via xhci_pci ehci_pci crc32c_intel
xhci_hcd ehci_hcd libata psmouse scsi_mod atl1c usbcore usb_common
fjes video wmi fan thermal button
Apr 20 07:05:37 rakete kernel: CPU: 7 PID: 16738 Comm: cp Tainted:
P           O    4.4.0-0.bpo.1-amd64 #1 Debian 4.4.6-1~bpo8+1
Apr 20 07:05:37 rakete kernel: Hardware name: System manufacturer
System Product Name/P8H67-V, BIOS 3707 07/12/2013
Apr 20 07:05:37 rakete kernel:  0000000000000286 000000006a1407c8
ffffffff812ed425 ffff88016b6dfb90
Apr 20 07:05:37 rakete kernel:  ffffffffa03817b8 ffffffff81077ea1
ffff88018e7fcd30 ffff88016b6dfbe8
Apr 20 07:05:37 rakete kernel:  ffff88005d863e88 ffff8801cde7a980
ffff88018e7fce48 ffffffff81077f2c
Apr 20 07:05:37 rakete kernel: Call Trace:
Apr 20 07:05:37 rakete kernel:  [<ffffffff812ed425>] ?
dump_stack+0x5c/0x77
Apr 20 07:05:37 rakete kernel:  [<ffffffff81077ea1>] ?
warn_slowpath_common+0x81/0xb0
Apr 20 07:05:37 rakete kernel:  [<ffffffff81077f2c>] ?
warn_slowpath_fmt+0x5c/0x80
Apr 20 07:05:37 rakete kernel:  [<ffffffffa02d74af>] ?
__btrfs_cow_block+0x56f/0x5e0 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffffa02d76af>] ?
btrfs_cow_block+0x10f/0x1d0 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffffa02db2cd>] ?
btrfs_search_slot+0x1fd/0xa30 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffffa02dd3f1>] ?
btrfs_insert_empty_items+0x71/0xc0 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffff811f4d92>] ?
insert_inode_locked4+0xa2/0x1c0
Apr 20 07:05:37 rakete kernel:  [<ffffffffa030ee5d>] ?
btrfs_new_inode+0x1cd/0x590 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffffa0310a77>] ?
btrfs_mkdir+0x107/0x1f0 [btrfs]
Apr 20 07:05:37 rakete kernel:  [<ffffffff811e80b0>] ?
vfs_mkdir+0xb0/0x140
Apr 20 07:05:37 rakete kernel:  [<ffffffff811e9d3e>] ?
SyS_mkdir+0xce/0x110
Apr 20 07:05:37 rakete kernel:  [<ffffffff81592736>] ?
system_call_fast_compare_end+0xc/0x6b
Apr 20 07:05:37 rakete kernel: ---[ end trace 025eb0e83ffed96f ]---
Apr 20 07:05:37 rakete kernel: BTRFS: error (device sdi) in
__btrfs_cow_block:1156: errno=-5 IO failure
Apr 20 07:05:37 rakete kernel: BTRFS info (device sdi): forced readonly

####
Try to copy again:
11# cp -r /root/ .
cp: cannot create directory './root': Read-only file system
####
/dev/sdg on /mnt/raid1 type btrfs
(ro,noatime,space_cache,autodefrag,subvolid=5,subvol=/)
####
plugin device sdg again:

Apr 20 07:07:39 rakete udisksd[3671]: Cleaning up mount point
/media/matthias/BACKUP (device 8:81 no longer exist)
Apr 20 07:07:39 rakete kernel: usb 3-1: USB disconnect, device number 3
Apr 20 07:07:39 rakete udisksd[3671]: Error statting /dev/sdg: No
such file or directory
Apr 20 07:07:39 rakete umount[16807]: umount: /mnt/raid1: target is busy
Apr 20 07:07:39 rakete umount[16807]: (In some cases useful info
about processes that
Apr 20 07:07:39 rakete umount[16807]: use the device is found by
lsof(8) or fuser(1).)
Apr 20 07:07:39 rakete systemd[1]: mnt-raid1.mount mount process
exited, code=exited status=32
Apr 20 07:07:39 rakete systemd[1]: Failed unmounting /mnt/raid1.
Apr 20 07:08:01 rakete kernel: usb 3-1: new SuperSpeed USB device
number 4 using xhci_hcd
Apr 20 07:08:01 rakete kernel: usb 3-1: New USB device found,
idVendor=152d, idProduct=0567
Apr 20 07:08:01 rakete kernel: usb 3-1: New USB device strings:
Mfr=10, Product=11, SerialNumber=5
Apr 20 07:08:01 rakete kernel: usb 3-1: Product: USB to ATA/ATAPI Bridge
Apr 20 07:08:01 rakete kernel: usb 3-1: Manufacturer: JMicron
Apr 20 07:08:01 rakete kernel: usb 3-1: SerialNumber: 152D00539000
Apr 20 07:08:01 rakete kernel: usb-storage 3-1:1.0: USB Mass Storage
device detected
Apr 20 07:08:01 rakete kernel: usb-storage 3-1:1.0: Quirks match for
vid 152d pid 0567: 5000000
Apr 20 07:08:01 rakete kernel: scsi host10: usb-storage 3-1:1.0
Apr 20 07:08:01 rakete mtp-probe[16826]: checking bus 3, device 4:
"/sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/usb3/3-1"
Apr 20 07:08:01 rakete mtp-probe[16826]: bus: 3, device: 4 was not an
MTP device
Apr 20 07:08:02 rakete kernel: scsi 10:0:0:0: Direct-Access     WDC
WD20 02FAEX-007BA0    0125 PQ: 0 ANSI: 6
Apr 20 07:08:02 rakete kernel: scsi 10:0:0:1: Direct-Access     WDC
WD75 00AACS-00C7B0    0125 PQ: 0 ANSI: 6
Apr 20 07:08:02 rakete kernel: scsi 10:0:0:2: Direct-Access     WDC
WD50 01AALS-00L3B2    0125 PQ: 0 ANSI: 6
Apr 20 07:08:02 rakete kernel: scsi 10:0:0:3: Direct-Access
SAMSUNG  SP2504C          0125 PQ: 0 ANSI: 6
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: Attached scsi generic sg6
type 0
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] 3907029168 512-byte
logical blocks: (2.00 TB/1.82 TiB)
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] Write Protect is off
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] Mode Sense: 67 00
10 08
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: Attached scsi generic sg7
type 0
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] No Caching mode
page found
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] Assuming drive
cache: write through
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] 1465149168 512-byte
logical blocks: (750 GB/699 GiB)
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: Attached scsi generic sg8
type 0
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] Write Protect is off
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] Mode Sense: 67 00
10 08
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: Attached scsi generic sg9
type 0
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] 976773168 512-byte
logical blocks: (500 GB/466 GiB)
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] No Caching mode
page found
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] Assuming drive
cache: write through
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] Write Protect is off
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] Mode Sense: 67 00
10 08
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] 488395055 512-byte
logical blocks: (250 GB/233 GiB)
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] No Caching mode
page found
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] Assuming drive
cache: write through
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] Write Protect is off
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] Mode Sense: 67 00
10 08
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] No Caching mode
page found
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] Assuming drive
cache: write through
Apr 20 07:08:02 rakete kernel: sd 10:0:0:0: [sdf] Attached SCSI disk
Apr 20 07:08:02 rakete kernel: sd 10:0:0:1: [sdj] Attached SCSI disk
Apr 20 07:08:02 rakete kernel: sd 10:0:0:2: [sdk] Attached SCSI disk
Apr 20 07:08:02 rakete kernel: sd 10:0:0:3: [sdl] Attached SCSI disk
Apr 20 07:08:02 rakete kernel: EXT4-fs (sdf1): recovery complete
Apr 20 07:08:02 rakete kernel: EXT4-fs (sdf1): mounted filesystem
with ordered data mode. Opts: (null)

####
still ro mode
/dev/sdj on /mnt/raid1 type btrfs
(ro,noatime,space_cache,autodefrag,subvolid=5,subvol=/)
####
14# btrfs fi show
Label: none  uuid: 16d5891f-5d52-4b29-8591-588ddf11e73d
    Total devices 3 FS bytes used 1.60GiB
    devid    1 size 698.64GiB used 3.03GiB path /dev/sdj
    devid    2 size 465.76GiB used 3.03GiB path /dev/sdk
    devid    3 size 232.88GiB used 0.00B path /dev/sdl
####





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