monogdb new file allocation failure

如题，python和mongodb（3.0版本）交互，报错 new file allocation failure:

具体的日志里面是

2016-01-15T14:58:46.082+0800 I STORAGE  [FileAllocator] allocating new datafile /var/lib/mongo/spiderdb.9, filling with zeroes...
2016-01-15T14:58:46.098+0800 I STORAGE  [FileAllocator] FileAllocator: posix_fallocate failed: errno:28 No space left on device falling back
2016-01-15T14:58:46.098+0800 I STORAGE  [FileAllocator] error: failed to allocate new file: /var/lib/mongo/spiderdb.9 size: 2146435072 failure creating new datafile; lseek failed for fd 64 with errno: errno:2 No such file or directory.  will try again in 10 seconds
2016-01-15T14:58:46.210+0800 I -        [conn16] Assertion: 12520:new file allocation failure

请各位大神帮忙看下怎么解决哈

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检查一下磁盘空间够不够……