HDD read write failure on single array

[lrcressy]

When a disk fails it would be nice to be able to force a removal of a device on a single array when the copy fails because of the drive failure. I just bought a WD 20 T drive which failed after 4 days usage. Because of hardware failure I had to recreate the entire filesystem.

[Forza-tng]

@lrcressy it's a very unfortunate thing that happened to you. When it comes to the single profile, there are several things that makes what you want very difficult. If you were using single profile for metadata, then the likelihood to survive a disk failure is near 0, because some metadata will undoubtedly be on the broken device. If you have raid1 profile, the metadata will survive one failed disk, and any data on that disk will not be readable. You could leave the filesystem in this state until a replacement is available. Any files (could be a lot, or most) with missing data will have to be recreated from backups, but the filesystem should be recoverable.

[lrcressy]

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On Wed, 2024-04-10 at 09:27 -0700, Forza wrote:

@lrcressy it's a very unfortunate thing that happened to you. When it comes to the single profile, there are several things that makes what you want very difficult. If you were using single profile for metadata, then the likelihood to survive a disk failure is near 0, because some metadata will undoubtedly be on the broken device. If you have raid1 profile, the metadata will survive one failed disk, and any data on that disk will not be readable. You could leave the filesystem in this state until a replacement is available. Any files (could be a lot, or most) with missing data will have to be recreated from backups, but the filesystem should be recoverable. — My usage currently looks like minus the returned 20T drive: $ sudo btrfs filesystem usage /home/video [sudo] password for leroy: Overall: Device size: 50.93TiB Device allocated: 13.46TiB Device unallocated: 37.47TiB Device missing: 0.00B Device slack: 0.00B Used: 13.41TiB Free (estimated): 37.53TiB (min: 18.79TiB) Free (statfs, df): 37.53TiB Data ratio: 1.00 Metadata ratio: 2.00 Global reserve: 512.00MiB (used: 0.00B) Multiple profiles: no

Data,single: Size:13.44TiB, Used:13.38TiB (99.57%) /dev/mapper/video-1 8.51TiB /dev/mapper/video-2 4.87TiB /dev/mapper/video-3 51.00GiB

Metadata,RAID1: Size:15.00GiB, Used:14.41GiB (96.08%) /dev/mapper/video-1 15.00GiB /dev/mapper/video-2 15.00GiB

System,RAID1: Size:8.00MiB, Used:1.42MiB (17.77%) /dev/mapper/video-1 8.00MiB /dev/mapper/video-2 8.00MiB

Unallocated: /dev/mapper/video-1 9.66TiB /dev/mapper/video-2 9.66TiB /dev/mapper/video-3 18.14TiB

I'm a paranoid old man and use cryptsetup to encrypt my /home partition and other data partitions before adding a file system. /dev/mapper/video-4 was the first Western Digital drive that ever failed on me. In the past many Seagate drives have failed thus I never buy them any more.

When I attempted to backup my directory /dvd/ to an external hard drive using rsync I received read errors like the following:

2024/04/07 13:43:10 [216956] rsync: [sender] read errors mapping "/home/video/archived videos/dvd/The Shawshank Redemption/THE_SHAWSHANK_REDEMPTION.iso": Input/output error (5)

2024/04/07 13:43:56 [216956] rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1336) [sender=3.2.7]

I attempted to remove the device with the read errors: btrfs device remove /dev/mapper/video-4 /home/video/ which gave me a bunch of read errors when it attempted to copy the device.

I attempted to remove all of the files with read errors and shrink the device size which also ended with failure.

What I would like to see is an option to force a removal of a failing device with bad blocks or read write errors turning off the copy process to other devices on the array.

I mount my btrfs file systems with the following options: autodefrag,rw,relatime,x-systemd.mount-timeout=5min

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