CyclopsSystemSoftware

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title: CyclopsSystemSoftware
---

# RAID 1

Copy partition table from `/dev/sda` to `/dev/sdb` and extend btrfs to RAID1

sfdisk -d /dev/sda > part_table
    sfdisk /dev/sdb < part_table
    btrfs device add /dev/sdb1 /
    btrfs balance start -dconvert=raid1 -mconvert=raid1 /

# btrfs boot issues

Configure grub to use `4.9.0-12` kernel in `/etc/default/grub`:

GRUB_DEFAULT="1>4"
  
Selects \*2nd\* menu option ("Advanced settings"), then \*5th\* submenu option.

# Replace Failed BTRFS Disk

## Identify the failed disk then yank it
```bash
btrfs device stats /   # show which disk has errors
mount   # observe mount option 'degraded'
btrfs filesystem show /
```

`btrfs filesystem show` output:
```log
 Label: none  uuid: 85f1e251-bb5b-45eb-9107-b804b9087464
        Total devices 2 FS bytes used 17.89GiB
        devid    2 size 111.79GiB used 80.02GiB path /dev/sdb1
        *** Some devices missing
```

Missing disk is devid 1.

## Hot Swap the new disk
```bash
echo ';' | sfdisk /dev/sdi  # partition

# replace devid:1 with disk at /dev/sdi1 for mountpoint /
btrfs replace start -r 1 /dev/sdi1 /
```

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