(bytes-per-inode) * (number-inode) =~ (filesystem size)
在mkfs.ext3中，blocksize最小为1024,而bytes-per-inode最小不能小于blocksize，因此指定bytes-per-inode为1024可以获得最大inode个数
文件系统 文件大小限制 文件系统大小限制
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ext2/3(1K bs) 16448 MB (~ 16 GB) 2048 GB (= 2 TiB)
ext2/3(2k bs) 256 GB 8192 GB (= 8 TiB)
ext2/3(4k bs) 2048 GB (= 2 TiB) 8192 GB (= 8 TiB)
ext2/3(8k bs) 65568 GB (~ 64 TiB) 32768 GB (= 32 TiB)
ReiserFS 3.5 2 GB 16384 GB (= 16 TiB)
ReiserFS 3.6(knl2.4) 1 EB 16384 GB (= 16 TiB)
XFS 8 EiB 8 EiB
JFS(512 bs) 8 EiB 512 TiB
JFS(4k bs) 8 EiB 4 PiB
NFSv2 (client side) 2 GB 8 EiB
NFSv3 (client side) 8 EiB 8 EiB
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