There is a lot of apparently authoritative but conflicting information on this topic out on the interwebs. I suspect the problem is that changes from LVM1 to LVM2 weren't explicitly highlighted. For example, I believe this is no longer true, but it still figures prominently in returns from google: > a 4 MB extent size imposes a logical volume size limitation of 256 Gigabytes I believe the below is now true, and that this is the reason the above is no longer relevant: > with LVM2, there's no limit on the maximum numbers of extents per PV/LV. IOW, the FAQ's statement: > For 32-bit CPUs on 2.6 kernels, the maximum LV size is 16TB. is a hard upper limit, and is not related to extent size - please confirm. And is there a maximum size for PV or VG and would this be related to extent size? Also, the man page state that the *default* extent size (if none is specified) is 4MB, but the HowTo states it's 32MB. Which is true? Or does this vary by vgcreate version, or per-distro configuration? Finally > having a large number of extents will slow down the tools leads me to: Would there be any negative impact of a very large extent size? I'm thinking of using 1GB (4096*256=1048576). This would make extents human-friendly when used directly as units in allocating space. Even 10 GB would only be 2% of the smallest drive I'm using, so wouldn't hamper flexibility, but IMO this seems a bit "out there". Any and all feedback welcome. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
