今日突然发现 vps 硬盘爆满了，然后才想着要买点容量进行扩容，经检查才发现原来有个分区没用上，坑啊，这服务商，干嘛不全给我加到主盘里面去，非得留一个空的分区给我，然后就想着怎么把它追加到主盘上，查了好久没找到可以实现的方法，大家帮我看看
[root@MyCloudServer ~]# fdisk -l Disk /dev/xvda: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000858c5 Device Boot Start End Blocks Id System /dev/xvda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/xvda2 64 1306 9972736 8e Linux LVM Disk /dev/xvdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0006cde7 Device Boot Start End Blocks Id System Disk /dev/mapper/vg_have-lv_root: 9168 MB, 9168748544 bytes 255 heads, 63 sectors/track, 1114 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_have-lv_swap: 1040 MB, 1040187392 bytes 255 heads, 63 sectors/track, 126 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 [root@MyCloudServer ~]# 我的环境和网站目录都是在主盘 /dev/xvda 的 /www 里面 我想要实现的是 使用 /dev/xvdb 对 /www 进行扩容，如果不能实现那就想要把 /www 转移到 /dev/xvdb 上面去，但是同时想要保证环境与网站能正常运作
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