Dne 30. 11. 18 v 10:35 Gionatan Danti napsal(a):
Hi list,
in BZ 1643651 I read:
"In 7.6 (and 8.0), lvm began using a new i/o layer (bcache)
to read and write data blocks."
Last time I checked, bcache was a completely different caching layer,
unrelated from LVM. The above quote, instead, implies that bcache is now
actively used by LVM.
Am I missing something? Can you explain how they interact/behave?
Hi
The name of i/o layer bcache is only internal to lvm2 code for caching
reads form disks during disk processing - the name comes from usage
of bTree and caching - thus the name bcache.
It's not a dm target - so nothing you could use for LVs.
And has nothing in common with exiting bcache kernel block device.
The only purpose is to slightly accelerate device scanning and probing - and
helps mostly in cases your system has tons a devices that needs to be scanned,
since this bcache is also using async disk reads for its filling....
Regards
Zdenek
_______________________________________________
linux-lvm mailing list
linux-lvm@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
