On 09/26/14 07:11 AM, Udo Grabowski (IMK) wrote:
On 26/09/2014 00:46, Andrew M. Hettinger wrote:
I'm presently running tests on a pool using 3x Samsung 850 SSDs on a
LSI-9211-8i
(IT) contoller. I thought I'd try seperating the intent log to see if
lowering
the write amplification on the pool-drives would help, so I added
another
matching SSD for that, but under load I still seem to get extensive
checksum
errors. Does anyone have any ideas as to what would be causing this?
Transport errors could be bad cabling. 850's are very new,
so I also wouldn't exclude firmware problems. But it could
also be that you again see an instance of a mysterious possible
bug when scrubbing mirrors. I myself have an SSD rpool
(Supertalent SataII), and nearly always get these errors
(though in the range of 10, not 150) when scrubbing this pool
since day 1, regardless of firmware. I never get them
Huh. It would be fun to see how ZfsOnLinux behaves with same pool on SSDs.
It could be run and installed while running Xubuntu live CD par example.
Or trz to import it from FreeBSD booted disk and import and see how it
behaves.
So it could be seen if it is an illumos kernel problem
or it behaves the same on ZFS implementation on other system(s) ,
therefore more is a hardware problem itself.
I would not find living with checksum and scrub errors acceptable.
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