[英]dd fail to write to tmpfs
I'd like to measure tmpfs performance by using dd. 我想用dd测量tmpfs的性能。 But it fail, like below: 但它失败了,如下所示:
# dd if=/dev/zero of=/tmp/128M bs=4M count=32 oflag=direct
dd: failed to open ‘/tmp/128M’: Invalid argument
Any help? 有帮助吗?
tmpfs不支持直接I / O并返回-EINVAL。
Vasily Tarasov solution worked with NFS too. Vasily Tarasov解决方案也适用于NFS。 I had: 我有:
dd if=/dev/urandom of=TEST.200GB iflag=direct bs=1M count=204800
dd: failed to open ‘/dev/urandom’: Invalid argument
then I have removed iflag=direct and it worked 然后我删除了iflag = direct并且它有效
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