Ram> Any one here actually use SSD caches for RAID arrays? Can you Ram> share your experience and let me know your choice of the type of Ram> cache methods your tired/used and why you think one is better or Ram> worse than other? If it is possible, please provide raid Ram> type/size and ssd size used. I'm using a pair of 4Tb drives mirrored, and a pair of 512gb SSDs, also mirrored, along with lvmcache to setup my caching across a couple of volumes. I honestly haven't seen huge improvements, but I also haven't had the time to do any serious testing either. Whcih I should do. I've been sorta thinking that using the Phoronix testing stuff would be the way to go. My SSDs and 4Tb drives are all on an LSI 8-port SATA controller, PCI-E 4x I think. It's an MPT SAS-2 controller. I did this so that my boot drives are some partitions on the SSDs, and then I use two more mirrored partitions for the cache. And this is an NFS server for my home directories, etc. I didn't use bcache because you can't remove a cache device without rebooting, or at least bringing a device offline and back online, which doesn't fit my desires to be able to dynamically add/remove caches, esp for the testing I've never bothered to do. John -- 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
