Technically, what you qualify below is a truism under any hardware. ZFS is
neither more or less susceptible to RAM failure as it has nothing to do with
ZFS. Anything that gets written to the pool technically is sound. You have
chosen a single possible point of failure, what of firmware, drive cache,
motherboard, power surges, motion, etc.?
RAM/ECC RAM is like consumer drives vs pro drives in your system, recent long
term studies have shown you don't get much more for the extra money.
I have been running ZFS in production using the past and current versions for
OS X on over 60 systems (12 are servers) since Apple kicked ZFS loose. No
systems (3 run ECC) have had data corruption or data loss. Some pools have
disappeared on the older ZFS but were easily recovered on modern (current
development) and past OpenSolaris, FreeBSD, etc., as I keep clones of
'corrupted' pools for such tests. Almost always, these were the result of
connector/cable failure. In that span of time no RAM has failed 'utterly' and
all data and tests have shown quality storage. In that time 11 drives have
failed and easily been replaced, 4 of those were OS drives, data stored under
ZFS and a regular clone of the OS also stored under ZFS just in case. All pools
are backed-up/replicated off site. Probably a lot more than most are doing for
data integrity.
No this data I'm providing is not a guarantee. It's just data from someone who
has grown to trust ZFS in the real world for clients that cannot lose data for
the most part due to legal regulations. I trust RAM manufacturers and drive
manufacturers equally, I just verify for peace of mind with ZFS.
--
Jason Belec
Sent from my iPad
On Mar 1, 2014, at 5:39 PM, Philip Robar philip.ro...@gmail.com wrote:
On Fri, Feb 28, 2014 at 2:36 PM, Richard Elling richard.ell...@gmail.com
wrote:
We might buy this argument if, in fact, no other program had the same
vulnerabilities. But *all* of them do -- including OSX. So it is disingenuous
to claim this as a ZFS deficiency.
No it's disingenuous of you to ignore the fact that I carefully qualified
what I said. To repeat, it's claimed with a detailed example and reasoned
argument that ZFS is MORE vulnerable to corruption due to memory errors when
using non-ECC memory and that that corruption is MORE likely to be extensive
or catastrophic than with other file systems.
As I said, Jason's and Daniel Becker's responses are reassuring, but I'd
really like a definitive answer to this so I've reached out to one of the
lead Open ZFS developers. Hopefully, I'll hear back from him.
Phil
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