Dne 17. 11. 24 v 11:26 "Thomas Brücker" napsal(a):
Hello developers and others,
I agree fully with your '2TB-argument'. So no longer zeroing.
I have taken a closer look to "blk-archive". "Packing to a remote archive"
there not yet works. I have an ((alpha ** n); n --> infinity)-solution of
my own, which can do this (it is accessible as an nbd device).
Furthermore I sometimes really need to copy the data device to another
location (see crazy-rationale, if you want).
Somehow I like modularity, leading to "<progr. a> | <progr. b> | ... " (here
"<...>" means a variable to be set).
(In further text, "data device" means solely a data device of a thin pool.)
Whats with / (I prefer to develop) an utility similar to "dd" (stealing code
from "dd" and "blk-archive" [I hope its all "GPL" or similar]), which skips
unallocated blocks either on a thin device(got idea from "blk-archive") or a
data device.
Hi
Of course you can always recreate the wheel as long as you have fun doing that
- so yep you can full be inspired how to deal with 'thin-pool' metadata to
know which areas have some real data inside - although I'd probably highly
recommend to stick with the use of original 'thin tools' - since those are the
'real tools' to work with thin-pool metadata - they know the format - they are
regularly updated when format change and so on... once you do you 'copy' of
this rust code - you are loosing all those feature - IMHO not worth. (Note
- sooner or later there will be a new format of metadata...)
And if there are missing features in blk-archive - let's open the issue -
AFAIK this tool is still in development - so reasonable feature requests will
be certainly implemented - you just need to write some good
examples/justifications how the feature should be working.
Regards
Zdenek
Sincerely
Thomas Bruecker
PS:
crazy rationale (to be skipped):
* My name: "pseudo-raid": raid5 with legs on the same device, especially a
hard disk. Ok, I admit, its slow.
* Reason:
* Modern hard disks are able to correct defective sectors, if the driver
knows, what should be in these sectors.
* You may not equip a notebook with additional hard disk.
Is this some sort of 'raid1 + writemostly' ?
And there is also another target - 'dm-era' - which is however not
supported (yet) by lvm2...
