Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Caitlin Bestler
Brebner, Gavin asked: >Price ! Why provide expensive redundant storage when cheap disks will do just >as well ? Because you are interested in the total cost. Using excessive network replication rather than local replication makes for a more expensive And less robust solution -- as long as the

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Caitlin Bestler
There are numerous reasons why you would want your Swift Object Server to also host a NAS server. But whether you are talking Nova volumes or Swift Objects, you would generally want the Volume Server or Object Server to access those "directly" rather than via NAS over a general network connecti

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Andrew Clay Shafer
> > > *This link shows the integration of NexentaStor (a NAS/SAN integrated >> storage solution) with Openstack Nova: >> http://mirantis.blogspot.com/2011/11/converging-openstack-with-nexenta.html >> * > > > > That's Nova, not Swift.. > In case of Nova, a NAS or SAN approach makes very much sense.

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Frederik Van Hecke
Paulo, > *I don't think anything prevents integrating Swift storage nodes with a > NAS. Latency could be increased but depending on load, network capacity > (shared vs dedicated), and use of caching, it is possible to achieve a good > performance.* Yes, but why would you do so.. Using NAS as

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Paulo Ricardo Motta Gomes
I don't think anything prevents integrating Swift storage nodes with a NAS. Latency could be increased but depending on load, network capacity (shared vs dedicated), and use of caching, it is possible to achieve a good performance. This link shows the integration of NexentaStor (a NAS/SAN integrat

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Brebner, Gavin
Michaël Van de Borne > Sent: Friday, March 16, 2012 2:33 PM > To: openstack@lists.launchpad.net > Subject: [Openstack] Swift: NAS or DAS? > > Hi all, > > on the very useful www.referencearchitecture.org website, and in every > piece of documentation on Swift, I never found

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread Frederik Van Hecke
Hey Michael, *Is there a specific reason why a NAS wouldn't be a good choice to build a > swift infrastructure?* Why would that make sense to you? The idea of Swift is to distribute the files over a large amount of "inexpensive" servers and prevent data loss by keeping multiple copies. Whereas

Re: [Openstack] Swift: NAS or DAS?

2012-03-16 Thread John Dickinson
Generally, you would introduce latency in the storage system by using a NAS attached to a storage drive. Also, at scale, your costs will be dominated by drive, so you will want to optimize the storage nodes for dense, cheap storage. --John On Mar 16, 2012, at 8:32 AM, Michaël Van de Borne wrot

[Openstack] Swift: NAS or DAS?

2012-03-16 Thread Michaël Van de Borne
Hi all, on the very useful www.referencearchitecture.org website, and in every piece of documentation on Swift, I never found anything like a NAS attached to a storage node. It was all about DAS solution. Is there a specific reason why a NAS wouldn't be a good choice to build a swift infrastru