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This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

Caution: see my comment at the end of the answer regarding the "gotcha" and potential data loss.

This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

Caution: In this case the filesystem was enclosed within a dmcrypt device. See my comment regarding the "gotcha" and potential data loss if this is not the case.

This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

Caution: see my comment at the end of the answer re the gotcha and potential data loss.

This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

Caution: see my comment at the end of the answer regarding the "gotcha" and potential data loss.

This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

This answer mentions writes to the failed disk causing the replace to grind to a halt.

It suggests to dmsetup to setup a COW device on top of the failed disk such that any writes succeed.

Caution: see my comment at the end of the answer re the gotcha and potential data loss.