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Add linux md raid write journal to and existing array

Should I use `mdadm --create` to recover my RAID?How to recover a crashed Linux md RAID5 array?Issue with degraded raid5 after power outagemdadm; previously working; after “failure”, cannot join array due to disk sizeReassemble mdadm-raid5RAID Array gone to read-onlymdadm root partition raid 1 fails intermittentlyRecover RAID5 array after partitions deleted'mdadm: RUN_ARRAY failed: Invalid argument' when creating RAID0need to rebuild mdadm raid5rebuilding mdadm raid5

1

I have a raid5 array with quite large disks, so reconstruction is really slow in case of a power outage. Thankfully, there is the --write-journal option for linux md raid. The man page lists the --write-journal option in the For create, build, or grow: section, so I supposed it should work in grow mode, and tried to add a write journal on the fly:

# mdadm --grow /dev/md1 --write-journal /dev/ssd/md1-journal

mdadm: :option --write-journal not valid in grow mode

Does anyone know whether I can add a write journal to an existing array? And if so, how?

linux mdadm software-raid raid5

share|improve this question

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

add a comment | 

1

I have a raid5 array with quite large disks, so reconstruction is really slow in case of a power outage. Thankfully, there is the --write-journal option for linux md raid. The man page lists the --write-journal option in the For create, build, or grow: section, so I supposed it should work in grow mode, and tried to add a write journal on the fly:

# mdadm --grow /dev/md1 --write-journal /dev/ssd/md1-journal

mdadm: :option --write-journal not valid in grow mode

Does anyone know whether I can add a write journal to an existing array? And if so, how?

linux mdadm software-raid raid5

share|improve this question

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

add a comment | 

I have a raid5 array with quite large disks, so reconstruction is really slow in case of a power outage. Thankfully, there is the --write-journal option for linux md raid. The man page lists the --write-journal option in the For create, build, or grow: section, so I supposed it should work in grow mode, and tried to add a write journal on the fly:

# mdadm --grow /dev/md1 --write-journal /dev/ssd/md1-journal

mdadm: :option --write-journal not valid in grow mode

Does anyone know whether I can add a write journal to an existing array? And if so, how?

linux mdadm software-raid raid5

share|improve this question

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

# mdadm --grow /dev/md1 --write-journal /dev/ssd/md1-journal

mdadm: :option --write-journal not valid in grow mode

share|improve this question

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

share|improve this question

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

asked Oct 17 '18 at 9:07

P.PéterP.Péter

27511 silver badge99 bronze badges

2 Answers
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3

It kind of should work like this:

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: Journal added successfully, making /dev/md42 read-write

mdadm: added /dev/loop3

However, currently (using kernel 4.18, mdadm 4.1-rc) that only seems to be possible for arrays that were created with journal in the first place. The above output was procuded after:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012] --write-journal /dev/loop3

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --fail /dev/loop3 --remove /dev/loop3

mdadm: set /dev/loop3 faulty in /dev/md42

mdadm: hot removed /dev/loop3 from /dev/md42

Creating an array without journal, all attempts to add a journal fail:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012]

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: /dev/md42 does not support journal device.

# mdadm --manage /dev/md42 --readwrite --add /dev/loop3

# echo journal > /sys/block/md42/md/dev-loop3/state

bash: echo: write error: Invalid argument

So it just doesn't seem to be possible yet.

I have found a discussion on the linux-raid mailing list that this is a planned feature. If it has been implemented since, I don't see how. Perhaps contact the mailing list yourself to remind mdadm devs there are people who want this to work!

You might have to resort to mdadm --create to re-create the raid or edit metadata of the array. Either option is a bit dangerous.

share|improve this answer

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

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add a comment | 

0

This PDF states it is possible: https://events.static.linuxfound.org/sites/events/files/slides/2016_vault_write_journal_cache_v2.pdf

mdadm --manage /dev/md0 --add-journal /dev/sdf

share|improve this answer

answered 26 mins ago

BrendonBrendon

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add a comment | 

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3

It kind of should work like this:

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: Journal added successfully, making /dev/md42 read-write

mdadm: added /dev/loop3

However, currently (using kernel 4.18, mdadm 4.1-rc) that only seems to be possible for arrays that were created with journal in the first place. The above output was procuded after:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012] --write-journal /dev/loop3

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --fail /dev/loop3 --remove /dev/loop3

mdadm: set /dev/loop3 faulty in /dev/md42

mdadm: hot removed /dev/loop3 from /dev/md42

Creating an array without journal, all attempts to add a journal fail:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012]

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: /dev/md42 does not support journal device.

# mdadm --manage /dev/md42 --readwrite --add /dev/loop3

# echo journal > /sys/block/md42/md/dev-loop3/state

bash: echo: write error: Invalid argument

So it just doesn't seem to be possible yet.

I have found a discussion on the linux-raid mailing list that this is a planned feature. If it has been implemented since, I don't see how. Perhaps contact the mailing list yourself to remind mdadm devs there are people who want this to work!

You might have to resort to mdadm --create to re-create the raid or edit metadata of the array. Either option is a bit dangerous.

share|improve this answer

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

add a comment | 

3

It kind of should work like this:

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: Journal added successfully, making /dev/md42 read-write

mdadm: added /dev/loop3

However, currently (using kernel 4.18, mdadm 4.1-rc) that only seems to be possible for arrays that were created with journal in the first place. The above output was procuded after:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012] --write-journal /dev/loop3

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --fail /dev/loop3 --remove /dev/loop3

mdadm: set /dev/loop3 faulty in /dev/md42

mdadm: hot removed /dev/loop3 from /dev/md42

Creating an array without journal, all attempts to add a journal fail:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012]

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: /dev/md42 does not support journal device.

# mdadm --manage /dev/md42 --readwrite --add /dev/loop3

# echo journal > /sys/block/md42/md/dev-loop3/state

bash: echo: write error: Invalid argument

So it just doesn't seem to be possible yet.

I have found a discussion on the linux-raid mailing list that this is a planned feature. If it has been implemented since, I don't see how. Perhaps contact the mailing list yourself to remind mdadm devs there are people who want this to work!

You might have to resort to mdadm --create to re-create the raid or edit metadata of the array. Either option is a bit dangerous.

share|improve this answer

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

add a comment | 

It kind of should work like this:

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: Journal added successfully, making /dev/md42 read-write

mdadm: added /dev/loop3

However, currently (using kernel 4.18, mdadm 4.1-rc) that only seems to be possible for arrays that were created with journal in the first place. The above output was procuded after:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012] --write-journal /dev/loop3

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --fail /dev/loop3 --remove /dev/loop3

mdadm: set /dev/loop3 faulty in /dev/md42

mdadm: hot removed /dev/loop3 from /dev/md42

Creating an array without journal, all attempts to add a journal fail:

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012]

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: /dev/md42 does not support journal device.

# mdadm --manage /dev/md42 --readwrite --add /dev/loop3

# echo journal > /sys/block/md42/md/dev-loop3/state

bash: echo: write error: Invalid argument

So it just doesn't seem to be possible yet.

I have found a discussion on the linux-raid mailing list that this is a planned feature. If it has been implemented since, I don't see how. Perhaps contact the mailing list yourself to remind mdadm devs there are people who want this to work!

You might have to resort to mdadm --create to re-create the raid or edit metadata of the array. Either option is a bit dangerous.

share|improve this answer

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: Journal added successfully, making /dev/md42 read-write

mdadm: added /dev/loop3

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012] --write-journal /dev/loop3

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --fail /dev/loop3 --remove /dev/loop3

mdadm: set /dev/loop3 faulty in /dev/md42

mdadm: hot removed /dev/loop3 from /dev/md42

# mdadm --create /dev/md42 --level=5 --raid-devices=3 /dev/loop[012]

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md42 started.

# mdadm --manage /dev/md42 --readonly --add-journal /dev/loop3

mdadm: /dev/md42 does not support journal device.

# mdadm --manage /dev/md42 --readwrite --add /dev/loop3

# echo journal > /sys/block/md42/md/dev-loop3/state

bash: echo: write error: Invalid argument

share|improve this answer

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

answered Oct 17 '18 at 10:35

frostschutzfrostschutz

28.7k22 gold badges6262 silver badges9696 bronze badges

0

This PDF states it is possible: https://events.static.linuxfound.org/sites/events/files/slides/2016_vault_write_journal_cache_v2.pdf

mdadm --manage /dev/md0 --add-journal /dev/sdf

share|improve this answer

answered 26 mins ago

BrendonBrendon

122 bronze badges

add a comment | 

0

This PDF states it is possible: https://events.static.linuxfound.org/sites/events/files/slides/2016_vault_write_journal_cache_v2.pdf

mdadm --manage /dev/md0 --add-journal /dev/sdf

share|improve this answer

answered 26 mins ago

BrendonBrendon

122 bronze badges

add a comment | 

This PDF states it is possible: https://events.static.linuxfound.org/sites/events/files/slides/2016_vault_write_journal_cache_v2.pdf

mdadm --manage /dev/md0 --add-journal /dev/sdf

share|improve this answer

answered 26 mins ago

BrendonBrendon

122 bronze badges

share|improve this answer

answered 26 mins ago

BrendonBrendon

122 bronze badges

answered 26 mins ago

BrendonBrendon

122 bronze badges

answered 26 mins ago

BrendonBrendon

122 bronze badges