Re: [Xen-devel] Shared image files and block script performance

2015-09-30 Thread Ian Campbell
On Tue, 2015-09-29 at 15:18 -0600, Mike Latimer wrote: > Hi Ian, > > On Tuesday, September 29, 2015 10:25:32 AM Ian Campbell wrote: > > On Mon, 2015-09-28 at 17:14 -0600, Mike Latimer wrote: > > > Any better options or ideas? > > > > Is part of the problem that shell is a terrible choice for

Re: [Xen-devel] Shared image files and block script performance

2015-09-29 Thread Ian Campbell
On Mon, 2015-09-28 at 17:14 -0600, Mike Latimer wrote: > Any better options or ideas? Is part of the problem that shell is a terrible choice for this kind of check? Would shelling out to a helper utility allow this to be written in something better? I think we'd still be constrained in the

Re: [Xen-devel] Shared image files and block script performance

2015-09-29 Thread Mike Latimer
Hi Ian, On Tuesday, September 29, 2015 10:25:32 AM Ian Campbell wrote: > On Mon, 2015-09-28 at 17:14 -0600, Mike Latimer wrote: > > Any better options or ideas? > > Is part of the problem that shell is a terrible choice for this kind of > check? There is some truth to that... ;) > Would

[Xen-devel] Shared image files and block script performance

2015-09-28 Thread Mike Latimer
Hi, In an environment with read-only image files being shared across domains, the block script becomes exponentially slower with every block attached. While this is irritating with a few domains, it becomes very problematic with hundreds of domains. Part of the issue was mentioned in a udev