There are scripts to integrate existing device into bcache (not sure how well it works). Jan > On 02 Jul 2015, at 12:59, Emmanuel Florac <eflorac@xxxxxxxxxxxxxx> wrote: > > > bcache has the advantage of being natively integrated to the linux > kernel, feeling more "proper". It seems slightly faster than flashcache > too, but YMMV. However you cannot add bcache as an afterthought to an > existing volume, but you can set up flashcache this way apparently. > I had a few crashes with bcache on different machines but never had any > corruption, so it looks production-safe. > > > Le Thu, 2 Jul 2015 07:48:48 -0300 > German Anders <ganders@xxxxxxxxxxxx> écrivait: > >> The idea is to cache rbd at a host level. Also could be possible to >> cache at the osd level. We have high iowait and we need to lower it a >> bit, since we are getting the max from our sas disks 100-110 iops per >> disk (3TB osd's), any advice? Flashcache? > > -- > ------------------------------------------------------------------------ > Emmanuel Florac | Direction technique > | Intellique > | <eflorac@xxxxxxxxxxxxxx> > | +33 1 78 94 84 02 > ------------------------------------------------------------------------
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