Hi Nikolaus, Zitat von Nikolaus Rath <Nikolaus@xxxxxxxx>:
Hello, The internet claims that using bcache with LVM is not a good idea (eg. on https://wiki.archlinux.org/index.php/Bcache )- but I wasn't able to find any substantial information other than this general recommendation.
looking at that article, it only references possibly ill-handled "discard" operations, when running bcache on top of LVM.
The article itself does positively mention sub-dividing bcache devices using LVM.
Is this still (or has ever been) correct? If so, what issues can arise? And does this happen only when using bcache on top of an LVM LV, or also when using a bcache device as an LVM PV?
We're running bcache between MD-RAID (RAID6 for the HDD backing store and RAID1 for caching SSDs) and LVM2 (using bcache0 as the only PV for the volume group) without any noticeable problem, for moderate to significant load (SAN/NAS servers with NFS, Samba, and virtual machines' storage via SCST/FC and SCST/iSCSI).
Regards, Jens -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
