看下手册就知道了。古老的lvm1格式，有网上流传很广的说法，256G限制。
如果是lvm2格式的，基本无限制，限制在于服务器本身的对硬盘的识别和cpu是32还是64，另一个就是系统的内核版本，2.4前的限制2T
以下手册原文：
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.
The 2.4 kernel has a limitation of 2TB per block device.
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