Hi,
We are designing a rather involved file server with an ext3 formatted
stripe (raid0) sitting on top of raid10 devices. Each raid10 device sits
on top of 3 iscsi targets, and has layout n3 (so it is effectively a 3
way mirror). We chose raid10 over raid1 due to an apparent read
performance benefit of raid10.
We are trying to decide whether to upgrade to a kernel newer than
2.6.34, where write barriers are ostensibly supported by all possible
raid types, because we are worried about ext3 corruption with no write
barrier support.
However, we are also worried about whether write barriers really "make
sense" in a multi-disk environment and are wondering whether they will
actually make a difference in our setup. For argument's sake, let's
assume that our drives honor write cache flushes.
Can somebody shed some light on how write barriers are implemented in
raid0 and raid10? Also, any critical comments on the validity of our
setup and/or assumptions is also welcome.
Many thanks!
Iordan Iordanov
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