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Update documentation for converting 512B-sector disks to 4096B sectors

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Joey Hafner 2022-07-15 10:51:58 -07:00
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nas/README.md
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@ -75,9 +75,23 @@ Partition: ID-1: / size: 62.23 GiB used: 26.85 GiB (43.1%) fs: zfs logical: free
## 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. Run `sg_format --size=4096 --format --fmtpinfo=0 /dev/[disknum]` for the disk.
4. Wait 12-16 hours (for 8 TB disk).
5. Remove and re-insert the disk.
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`):
```bash
nohup sg_format --size=4096 --format --fmtpinfo=0 /dev/da15 & \
nohup sg_format --size=4096 --format --fmtpinfo=0 /dev/da16 & \
nohup sg_format --size=4096 --format --fmtpinfo=0 /dev/da17 &
```
Alternatively, try this for the first time:
```bash
for disk in da15 da16 da17; do mkdir -p ~/.formatting/$disk && cd ~/.formatting/$disk && nohup sg_format --size=4096 --format --fmtpinfo=0 /dev/$disk &; done
```
5. Close the terminal. Then log back in and run `ps -aux | grep sg_format` to confirm all processes are running. Check SMART status for disks with `for disk in da15 da16 da17; do smartctl -a /dev/$disk; done` (where `da15 da16 da17` is your list of disks).
6. Wait 12-16 hours (for 8 TB disk).
7. Remove and re-insert the disk.
## Perform a large copy operation in the background
0. `cd ~` for consistent placement of `nohup.out`