Andre Sachs via smartos-discuss wrote:
Hi
We have a bunch of Samsung EVO 840's that we are trying to use as log
devices on some old nodes to give them a bit of life.
The nodes are using an LSI 2008 controller and run well.
When we add the EVO as an slog device writes max out at 30Mb/s. We
then swapped the log for an Intel DC3700 and got 200MB's on the pool.
I've testes 840's in various places in a pool (I'm currently using them
for cache) and I didn't notice that poor performance as a log.
Even though they performed reasonably well, I wouldn't use them for logs
because they don't have power loss protection.
You didn't say how you tested them as logs, which is an important
detail. My testing includes hammering the pool with synchronous 4K
writes from one to 32 threads.
--
Ian.
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