Bluestore shouldn't have changed the disk requirements at all. I presume you are running a kernel newer than 2.6.33 so are probably okay with having the drive cache on, but it will vary with your controller I suspect.
-Greg
On Mon, Oct 23, 2017, 3:32 AM Hans van den Bogert <hansbogert@xxxxxxxxx> wrote:
_______________________________________________HansThanks!2. Depending on item 1., could and should I enable drive write cache for the disks attached to a HP b140i controller.1. Did anybody do extensive testing, with luminous in combination with drive write cache enabled, or at least elaborate on the subject.So my main two questions are:For our cluster specifically, we use HP gen 9 with a b140i controller where disks are directly attached (i.e., not RAID). Often with the Linux kernel, controllers automatically enable drive write cache for directly attached harddisks since this *should* be safe as long as harddisks correctly adhere to flush semantics . In the case of the b140i controller; I can confirm with `hdparm -W /dev/sdx` that drive write cache is *not* enabled by default.For Bluestore I can't find any documentation or discussions about drive write cache, while I can imagine that revisiting this subject might be necessary.Hi All,For Jewel there is this page about drive cache: http://docs.ceph.com/docs/jewel/rados/configuration/filesystem-recommendations/#hard-drive-prep
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