Re: Out-of-order writing by disk drives

[Folkert van Heusden]

> I have released a new version of hdtest, a program that tests whether
> hard disks write out-of-order relative to the order that the writes
> were passed to them from the OS.  You find the program at
> http://www.complang.tuwien.ac.at/anton/hdtest/

Not sure if it matters but it seems open-iscsi (both target and
initiator are linux systems) works fine with respect to the write
barriers: while running hdtest on an iscsi device I suddenly stopped the
traffic flowing using an iptables DROP-rule. Then of course I stopped
the iscsi initiator, removed the rules, restarted the initator and ran
hdcheck: all above the line have the correct magic.


Folkert van Heusden

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