On Jan 15, 2012, at 8:49 PM, Bob Friesenhahn wrote:
> On Sun, 15 Jan 2012, Edward Ned Harvey wrote:
>> Such failures can happen undetected with or without ECC memory. It's simply
>> less likely with ECC. The whole thing about ECC memory... It's just doing
>> parity. It's a very weak checksum. If corruption happens in memory, it's
> I am beginning to become worried now. ECC is more than "just doing parity".
It depends. ECC is a very generic term. Most "ECC memory" is SECDED, except for
high-end servers and mainframes.
> There have been enough sequential errors now (a form of corruption) that I
> think that you should start doing research prior to posting.
I've been collecting a number of ZFS bit error reports (courtesy of fmdump -eV)
and I have
never seen a single-bit error in a block. The errors appear to be of the
overwrite or stuck-at
variety that impact multiple bits. This makes sense because most disks already
correct up to
8 bytes (or so) per sector.
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