Re: [Xen-users] ssd cache

[Gordan Bobic <gordan@xxxxxxxxxx>]

Sorry, no idea, I never used it.

On 07/08/2014 10:10 PM, jacek burghardt wrote:
> 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
> <mailto:gordan@xxxxxxxxxx>> wrote:
>
>     On 2014-07-08 09:24, Wouter de Geus wrote:
>
>         * jacek burghardt <jaceksburghardt@xxxxxxxxx
>         <mailto: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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