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关于PE个数,我自己补充下:
问题1:LVM 对PE个数的限制?是VG还是LV?
答案:LVM1限制每个PE从8K到16G,并且个数限制到65534;
LVM2,PE大小和每个VG中PE个数没有LVM1限制,但是PE个数也不宜过多。
参考:man vgcreate -s
If the volume group metadata uses lvm1 format, extents can vary in size from 8KB to 16GB and there is a limit of 65534 extents in each logical volume. The default of 4 MB leads to a maximum logical volume size of around 256GB.
If the volume group metadata uses lvm2 format those restrictions do not apply, but having a large number of extents will slow down the tools but have no impact on I/O performance to the logical volume. The smallest PE is 1KB.
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