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Update disk replacement docs.

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Update disk reformat docs.
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Joey Hafner 2022-10-07 16:19:58 -07:00
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@ -86,11 +86,18 @@ Partition: ID-1: / size: 62.2 GiB used: 26.85 GiB (43.2%) fs: zfs logical: freen
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</details>
## Replace a failing disk
1. Get the disknum (like `da4`), either in the web UI or with the ~/disklist.pl script, for the disk that needs to be replaced.
2. Refer to the [Physical Disk Locations](#physical-disk-locations-ds4243) chart to determine which shelf slot the disk is in. Remove the disk.
3. Insert the new disk and wait 60 seconds for it to be detected. It may not show up in the web UI.
4. Check the sector size of the new disk with `smartctl -a /dev/<disknum> | grep block`. If `Logical block size` is `512 bytes` (or anything other than `4096 bytes`), then the disk needs to be reformatted.
5. Reformat the disk as described under [Convert a 512B-sector disk](#convert-a-512b-sector-disk-to-4096b-sectors). This will take several hours.
6. Begin resilvering the pool with the new disk. Navigate to [Storage -> Pools](https://nas.jafner.net/ui/storage/pools). Click the gear icon in the top-right of the affected pool and click "Status". Find the missing disk. It should look like `/dev/gptid/<some-uuid>...` with the status "REMOVED". Click the triple-dot icon on the right and select "Replace".
## Convert a 512B-sector disk to 4096B sectors
1. Make sure the disk is not currently in use.
2. Get the disknum (like `da4`), either in the web UI or with the ~/disklist.pl script.
3. Check the current sector size with `smartctl -a /dev/<disknum> | grep block`.
4. Reformat the disk(s) with the `sg_format` command. Use the following flags: `--size=4096 --format --fmtpinfo=0`. Then finally the disk location (e.g. `/dev/da15`). Use the `nohup` utility and the `&` operator to run the command in the background. An example one-liner for three disks (`da15`, `da16`, `da17`):
1. Get the disknum (like `da4`), either in the web UI or with the ~/disklist.pl script, for the disk that needs to be replaced.
2. Check the current sector size with `smartctl -a /dev/<disknum> | grep block`. If `Logical block size` is `512 bytes` (or anything other than `4096 bytes`), then the disk needs to be reformatted.
3. Reformat the disk(s) with the `sg_format` command. Use the following flags: `--size=4096 --format --fmtpinfo=0`. Then finally the disk location (e.g. `/dev/da15`). Use the `nohup` utility and the `&` operator to run the command in the background. An example one-liner for three disks (`da15`, `da16`, `da17`):
```bash
nohup sg_format --size=4096 --format --fmtpinfo=0 /dev/da15 & \