Re: ont out of 6 bcache devices does not register automatically

Am 22.11.2017 um 13:16 schrieb Coly Li:

On 22/11/2017 7:23 PM, Stefan Priebe - Profihost AG wrote:

quoted

Hello,

i've 6 bcache blk devices attached to 3 caching ssds (2 each). One fails
to register automatically at boot time.

After reboot i always need to execute:
echo /dev/sdf1 >/sys/fs/bcache/register

to bring up the bcache device.

Any idea?

Hi Stefan,

Is there any clue from kernel message ?

Sadly not.

Working one:
]# dmesg | grep sdi
[    1.060377] sd 5:0:0:0: [sdi] 1953525168 512-byte logical blocks:
(1.00 TB/932 GiB)
[    1.060393] sd 5:0:0:0: [sdi] Write Protect is off
[    1.060396] sd 5:0:0:0: [sdi] Mode Sense: 00 3a 00 00
[    1.060425] sd 5:0:0:0: [sdi] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[    1.104341]  sdi: sdi1
[    1.104644] sd 5:0:0:0: [sdi] Attached SCSI disk
[    2.005452] bcache: register_bdev() registered backing device sdi1
[    2.045211] bcache: bch_cached_dev_attach() Caching sdi1 as bcache0
on set 76b95bf8-9cc7-407f-9f9e-a42b6d1bcb27


not working one:
# dmesg | grep sdf
[    0.946107] sd 0:0:5:0: [sdf] 1953525168 512-byte logical blocks:
(1.00 TB/932 GiB)
[    1.400267] sd 0:0:5:0: [sdf] Write Protect is off
[    1.400267] sd 0:0:5:0: [sdf] Mode Sense: 00 00 00 00
[    1.401347] sd 0:0:5:0: [sdf] Write cache: enabled, read cache:
enabled, supports DPO and FUA
[    1.902910]  sdf: sdf1
[    2.341289] sd 0:0:5:0: [sdf] Attached SCSI disk
[  295.458804] bcache: register_bdev() registered backing device sdf1
[  295.506656] bcache: bch_cached_dev_attach() Caching sdf1 as bcache5
on set 76b95bf8-9cc7-407f-9f9e-a42b6d1bcb27

At 295s i registeeed it manually.

Greets,
Stefan

Thanks.

Coly Li

quoted

Register happens through the following udev file:
# register bcache devices as they come up
# man 7 udev for syntax

SUBSYSTEM!="block", GOTO="bcache_end"
ACTION=="remove", GOTO="bcache_end"

# blkid was run by the standard udev rules
# It recognised bcache (util-linux 2.24+)
ENV{ID_FS_TYPE}=="bcache", GOTO="bcache_backing_found"
# It recognised something else; bail
ENV{ID_FS_TYPE}=="?*", GOTO="bcache_backing_end"

# Backing devices: scan, symlink, register
IMPORT{program}="probe-bcache -o udev $tempnode"
ENV{ID_FS_TYPE}!="bcache", GOTO="bcache_backing_end"
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"

LABEL="bcache_backing_found"
RUN+="bcache-register $tempnode"
LABEL="bcache_backing_end"

# Cached devices: symlink
DRIVER=="bcache", ENV{CACHED_UUID}=="?*", \
        SYMLINK+="bcache/by-uuid/$env{CACHED_UUID}"
DRIVER=="bcache", ENV{CACHED_LABEL}=="?*", \
        SYMLINK+="bcache/by-label/$env{CACHED_LABEL}"

LABEL="bcache_end"
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