Re: [Xen-users] ssd cache

[jacek burghardt <jaceksburghardt@xxxxxxxxx>]

Any experience with enhanceio it seems best you can remove cache at will. I know i can cache lvm is it possible to cache hard drive that have lvm on it ?

On Tue, Jul 8, 2014 at 3:05 AM, Gordan Bobic <gordan@xxxxxxxxxx> wrote:

On 2014-07-08 09:24, Wouter de Geus wrote:

* jacek burghardt <jaceksburghardt@xxxxxxxxx> [2014-07-07 16:00:58 -0600]:

Is anyone using ssd drive as xen cache? Having bcache will tat benefit xen
when it comes to vm hard drives ?

I'm using a ssd drive with EnhanceIO in writeback mode on the mdraid
device underneath LVM.
Speeds up writes a lot for all LVM volumes on that raid device that
the domU's use.

The nice thing of enhanceio is that you can apply it to just a generic
block device.
I also looked at bcache but iirc you need to reformat your disk for
that to work, which simply isn't an option for me on that machine.

If reformatting isn't an option this won't help, but if you can
reformat, ZFS supports ZIL for buffering synchronous writes to SSD,
as well as caching reads onto SSD (L2ARC).

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