I have been looking at the options for SSD caching for a bit now. Here is my take on the current options: 1) bcache - Seems to have lots of reliability issues mentioned on mailing list with little sign of improvement. 2) flashcache - Seems to be no longer (or minimally?) developed/maintained, instead folks are working on the fork enhanceio. 3) enhanceio - Fork of flashcache. Dropped the ability to skip caching on sequential writes, which many folks have claimed is important for Ceph OSD caching performance. (see: https://github.com/stec-inc/EnhanceIO/issues/32) 4) LVM cache (dm-cache) - There is now a user friendly way to use dm-cache, through LVM. Allows sequential writes to be skipped. You need a pretty recent kernel. I am going to be trying out LVM cache on my own cluster in the next few weeks. I will share my results here on the mailing list. If anyone else has tried it out I would love to hear about it. -Brendan > In a long term use I also had some issues with flashcache and enhanceio. I've noticed frequent slow requests. > > Andrei _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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