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data_1
2014 Oct 14
3
Filesystem writes unexpectedly slow (CentOS 6.4)
.../sec range, depending on write sizes, which is about what I'd expect.
However, when I have an ext4 filesystem on this device, mounted with noatime and
data=writeback, (the filesystem is completely empty) and I test with dd, the
results are less encouraging:
dd bs=1M if=/dev/zero of=/Volumes/data_10-2/test.bin count=40000
40000+0 records in
40000+0 records out
41943040000 bytes (42 GB) copied, 292.288 s, 143 MB/s
Now, I'm not expecting to get the raw device speeds, but this seems at least to
be 2-3 times slower than what I'd expect.
Using conv=fsync oflag=direct makes it utterly pat...