26 Mar
2012
26 Mar
'12
10:11 p.m.
On Fri, 2012-03-23 at 23:12 -0700, Linda Walsh wrote:
Next -- bench "cp -ax", against rsync -axHAX when it has to copy >75% of the data (cp ~6-8x speed). But for file speed, 'dd' is king, as it can use large buffers (~16MB gives best results on my local Gbit network), but it misses all those pesky acls and extended attrs, not to mention file perms...*sigh* Compare that to the I/O done 4k at a time by many older utils...
cp -ax: real 0m3.088s user 0m0.034s sys 0m3.054s
rsync -axHAX real 0m15.850s user 0m19.314s sys 0m8.816s
dsync's time was over six minutes. Each time I cleared out thedestination folder. dsync is doing something that is taking much, much, much longer to do.
...Jeff