| 1 |
On Sunday, 26 September 2021 11:57:43 BST Peter Humphrey wrote: |
| 2 |
> Hello list, |
| 3 |
> |
| 4 |
> I have an external USB-3 drive with various system backups. There are 350 |
| 5 |
> .tar files (not .tar.gz etc.), amounting to 2.5TB. I was sure I wouldn't |
| 6 |
> need to compress them, so I didn't, but now I think I'm going to have to. |
| 7 |
> Is there a reasonably efficient way to do this? I have 500GB spare space on |
| 8 |
> /dev/sda, and the machine runs constantly. |
| 9 |
|
| 10 |
To complete the topic, and in case anyone's interested, I've settled on the |
| 11 |
following method, which could have been made more general, but this way I |
| 12 |
have a complete set of compressed tarballs in two places in case I need to |
| 13 |
recover something. |
| 14 |
|
| 15 |
This is the command to compress one week's backups: |
| 16 |
|
| 17 |
# (cd /mnt/sdc/wstn/main/vvv.old && time (for tar_archive in *.tar; do zstd - |
| 18 |
T0 --rm "${tar_archive}" -o /mnt/bu-space/vvv.old/"${tar_archive}.zst"; done |
| 19 |
&& cp /mnt/bu-space/vvv.old/* /mnt/sdc/wstn/main/vvv.old/ && sync)) |
| 20 |
|
| 21 |
This was 36GB and took 20 minutes. |
| 22 |
|
| 23 |
-- |
| 24 |
Regards, |
| 25 |
Peter. |
Archives