DragonFly users List (threaded) for 2008-01
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DragonFly users List (threaded) for 2008-01
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Futures - HAMMER comparison testing?

From: Bill Hacker <wbh@xxxxxxxxxxxxx>
Date: Tue, 15 Jan 2008 07:09:34 +0000

I'm guessing it will be a while yet before HAMMER is ready for this, but it seems to be moving fast - and cleanly - so...

. .. to the extent networked clustering AND inherent recoverablility are intended to be major strengths - to what comparable fs should we expect to look if we were to compare performance & features?

My own first impression includes:

- IBM's 'GPFS' (hard for mere mortals to get access to a realistic test environment, but perhaps performance is well documented somewhere in a Redpaper?)

- Just-acquired-by-Sun 'Lustre' (an unknown to me)

- CMU's AFS (in ports. Has never seemed particularly magical to me..)

- Plan 9's Fossil/Venti (likewise, even when run 'native' - IMNSHO, actually no longer viable).

- Is NFS a realistic candidate in some incarnation?

Others? [1]

and - eventual performance quite aside, should we be looking at stress test design [2], or are there benchmarks already appropriate?

Bill Hacker

[1] I don't know that ZFS *inherently* plays in the cluster yet - but Lustre was allegedly purchased in order to be worked in with ZFS so... 'maybe soon'.

[2] Tracking ZFS from mailing lists gives me the impression that is has been relatively solid for PJD on small HDD and RAM. Likewise for Sun on massively greater RAM and HDD arrays.

BUT - that many of the reported problems are from folks in the 'tween decks' - i.e. larger arrays amd RAM than PJD reports as solid, but less available RAM-to-disk than Sun generally uses for real-world use.

So the question arises if HAMMER will

a) be overly sensitive to / hungry for - memory as a resource

b) if so, at least just slow-down when short-changed rather than crashing.

c) IF crashed, (or otherwise treated rudely) be more certain of trouble-free recovery than product 'x'.

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