Network/CyclopsSystemSoftware.md
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@@ -22,9 +22,32 @@ Configure grub to use `4.9.0-12` kernel in `/etc/default/grub`:
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GRUB_DEFAULT="1>4"
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-
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-
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Selects \*2nd\* menu option ("Advanced settings"), then \*5th\* submenu option.
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- [2]: CyclopsSystemSoftware?action=sourceblock&num=1
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- [3]: CyclopsSystemSoftware?action=sourceblock&num=2
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+# Replace Failed BTRFS Disk
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+
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+## Identify the failed disk then yank it
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+```bash
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+btrfs device stats / # show which disk has errors
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+mount # observe mount option 'degraded'
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+btrfs filesystem show /
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+```
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+
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+`btrfs filesystem show` output:
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+```log
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+ Label: none uuid: 85f1e251-bb5b-45eb-9107-b804b9087464
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+ Total devices 2 FS bytes used 17.89GiB
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+ devid 2 size 111.79GiB used 80.02GiB path /dev/sdb1
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+ *** Some devices missing
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+```
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+
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+Missing disk is devid 1.
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+
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+## Hot Swap the new disk
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+```bash
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+echo ';' | sfdisk /dev/sdi # partition
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+
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+# replace devid:1 with disk at /dev/sdi1 for mountpoint /
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+btrfs replace start -r 1 /dev/sdi1 /
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+```
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+