Hi,
I have hit the synchronous NFS writing wall just like many people do.
There also have lots of discussion about the solutions here.
I want to post all of my exploring fighting done recently to discuss and share:
1): using the normal SATA-SSDs(intel/ocz) as ZIL device. For intel just EOLed
50nm SSDs product line and the spec of the x25-M G2(34nm) 160G is getting
more decent, I used this one. I get good performance boost compared with
no slog.
I also manually did unplugging power server times, the outcome seems good
-- I got
no data corruption. But there is always potential risk - does it have
built-in ram cache?
We get no clear answer from intel.
2): using PCIE-SSD(i.e. fusionio's ioDrive). For the universal standard of
PCIE-SSD is still on the way, the responding driver
under solaris become apparent. And also the cost is very high.
3): using PCIE-DRAM-with(out)-SSD(i.e. marvell's write acceleration module
(WAM), ddrdrive X1, curtisssd's
HyperCache. It has the higest spec but the same driver and high cost issue.
4): using SATA--DRAM-with(out)-SSD(i.e acard's 9010, curtisssd's HyperHD). No
driver issue and price is in the middle.
I also tried acard 9010, the result is good enough.
So it seems we have to wait awhile to get a really ideal ZIL device solution.
If intel/ocz can confirm no ram cache, that will be good news.
Thanks.
Fred
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