On Mon, Jun 7, 2010 at 9:54 PM, Ian Dall <ian@xxxxxxxxxxxxxxxxxxxxx> wrote: > On Mon, 2010-06-07 at 15:14 -0400, Bill Davidsen wrote: >> Actually playing with that now. I got an Intel SATA 40GB SSD, and I am >> trying various combinations of things to put on it. One thing which I >> hoped would benefit was to put a f/s journal on SSD and then use the >> option to push all through the journal (data=journal) in hopes that it >> would then free the RAM needed for cache and thus speed operation. >> >> Since none of that has generated the performance I hoped, > > Interesting. If its the X25-V that you have, write performance is > nothing to write home about even compared to a single hard drive, let > alone a raid. By journaling data as well (as metadata), you just add > extra write overhead, possibly even a new bottleneck. Depends on whether you are talking about small, seeky writes or large writes. Even the X25-V will kill any rotating drive in small seeky writes, but if you are trying to write big files faster than ~40MB/s, the the rotating disk might win depending on the exact one you are comparing it to. >> I also played with mirroring and write mostly, etc. Does provide a >> general solution, at least in my tests. > > Do you mean "does NOT"? write-mostly DOES work well in my tests... -Dave -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
