Re: [PATCH 2/2] mdadm: remove journal with "remove-journal"

I don't see any evidence that either of these two patches made it to 
git. Is this the correct repo?

git.kernel.org/pub/scm/utils/mdadm/mdadm.git

--Larkin

Hi Larkin,

We didn't ship this patch. Instead, we decide to use sysfs entry

/sys/block/mdXXX/md/consistency_policy

You can find the patch at:

https://marc.info/?l=linux-raid&m=149063896208043

Thanks,
Song

Thanks!

--Larkin

On 8/31/2017 1:51 PM, Song Liu wrote:

Hi Larkin,

We didn't ship this patch. Instead, we decide to use sysfs entry

/sys/block/mdXXX/md/consistency_policy

You can find the patch at:

https://marc.info/?l=linux-raid&m=149063896208043

Thanks,
Song
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Is it not possible to permanently remove a journal and return to resync 
mode?

Here's what I tried:

#  mdadm --readonly /dev/md124

# cat /proc/mdstat
Personalities : [raid10] [raid0] [raid6] [raid5] [raid4]
md124 : active (read-only) raid5 md123[7] md127p4[15](J) sdp1[13] 
sdl1[10] sdg1[12] sdf1[11] sdo1[14] sdj1[8] sdq1[9] md122[6]
       62509129728 blocks super 1.2 level 5, 512k chunk, algorithm 2 
[9/9] [UUUUUUUUU]

# mdadm /dev/md124 --fail /dev/md127p4
mdadm: set /dev/md127p4 faulty in /dev/md124

# mdadm /dev/md124 --remove /dev/md127p4
mdadm: hot removed /dev/md127p4 from /dev/md124

# cat /sys/block/md124/md/consistency_policy
journal

# echo resync > /sys/block/md124/md/consistency_policy

# cat /sys/block/md124/md/consistency_policy
resync

# mdadm --stop /dev/md124
mdadm: stopped /dev/md124

# mdadm --assemble /dev/md124 /dev/md12[23] /dev/sd[goqpjfl]1
mdadm: Not safe to assemble with missing or stale journal device, 
consider --force.

--Larkin

On 8/31/2017 1:51 PM, Song Liu wrote:

Hi Larkin,

We didn't ship this patch. Instead, we decide to use sysfs entry

/sys/block/mdXXX/md/consistency_policy

You can find the patch at:

https://marc.info/?l=linux-raid&m=149063896208043

Thanks,
Song
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On Nov 16, 2017, at 9:35 AM, Larkin Lowrey [off-list ref] wrote:

Is it not possible to permanently remove a journal and return to resync mode?

Here's what I tried:

#  mdadm --readonly /dev/md124

# cat /proc/mdstat
Personalities : [raid10] [raid0] [raid6] [raid5] [raid4]
md124 : active (read-only) raid5 md123[7] md127p4[15](J) sdp1[13] sdl1[10] sdg1[12] sdf1[11] sdo1[14] sdj1[8] sdq1[9] md122[6]
      62509129728 blocks super 1.2 level 5, 512k chunk, algorithm 2 [9/9] [UUUUUUUUU]

# mdadm /dev/md124 --fail /dev/md127p4
mdadm: set /dev/md127p4 faulty in /dev/md124

# mdadm /dev/md124 --remove /dev/md127p4
mdadm: hot removed /dev/md127p4 from /dev/md124

# cat /sys/block/md124/md/consistency_policy
journal

# echo resync > /sys/block/md124/md/consistency_policy

# cat /sys/block/md124/md/consistency_policy
resync

Could you please try the following command here:

echo active > /sys/block/md124/md/array_state

# mdadm --stop /dev/md124
mdadm: stopped /dev/md124

# mdadm --assemble /dev/md124 /dev/md12[23] /dev/sd[goqpjfl]1
mdadm: Not safe to assemble with missing or stale journal device, consider --force.

On 11/16/2017 12:55 PM, Song Liu wrote:

quoted

On Nov 16, 2017, at 9:35 AM, Larkin Lowrey [off-list ref] wrote:

# mdadm /dev/md124 --fail /dev/md127p4
mdadm: set /dev/md127p4 faulty in /dev/md124

# mdadm /dev/md124 --remove /dev/md127p4
mdadm: hot removed /dev/md127p4 from /dev/md124

# cat /sys/block/md124/md/consistency_policy
journal

# echo resync > /sys/block/md124/md/consistency_policy

# cat /sys/block/md124/md/consistency_policy
resync

Could you please try the following command here:

echo active > /sys/block/md124/md/array_state

quoted

# mdadm --stop /dev/md124
mdadm: stopped /dev/md124

# mdadm --assemble /dev/md124 /dev/md12[23] /dev/sd[goqpjfl]1
mdadm: Not safe to assemble with missing or stale journal device, consider --force.

This worked, thanks!

--Larkin