Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-05 Thread Torrey McMahon
Not true. There are different ways that a storage array, and it's controllers, connect to the host visible front end ports which might be confusing the author but i/o isn't duplicated as he suggests. On 4/4/2010 9:55 PM, Brad wrote: I had always thought that with mpxio, it load-balances IO

Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-05 Thread Bob Friesenhahn
On Sun, 4 Apr 2010, Brad wrote: I had always thought that with mpxio, it load-balances IO request across your storage ports but this article http://christianbilien.wordpress.com/2007/03/23/storage-array-bottlenecks/ has got me thinking its not true. The available bandwidth is 2 or 4Gb/s

Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-05 Thread Brad
I'm wondering if the author is talking about cache mirroring where the cache is mirrored between both controllers. If that is the case, is he saying that for every write to the active controlle,r a second write issued on the passive controller to keep the cache mirrored? -- This message

Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-05 Thread Torrey McMahon
The author mentions multipathing software in the blog entry. Kind of hard to mix that up with cache mirroring if you ask me. On 4/5/2010 9:16 PM, Brad wrote: I'm wondering if the author is talking about cache mirroring where the cache is mirrored between both controllers. If that is the

Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-05 Thread Tim Cook
On Mon, Apr 5, 2010 at 8:16 PM, Brad bene...@yahoo.com wrote: I'm wondering if the author is talking about cache mirroring where the cache is mirrored between both controllers. If that is the case, is he saying that for every write to the active controlle,r a second write issued on the

[zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-04 Thread Brad
I had always thought that with mpxio, it load-balances IO request across your storage ports but this article http://christianbilien.wordpress.com/2007/03/23/storage-array-bottlenecks/ has got me thinking its not true. The available bandwidth is 2 or 4Gb/s (200 or 400MB/s – FC frames are 10

Re: [zfs-discuss] mpxio load-balancing...it doesn't work??

2010-04-04 Thread Tim Cook
On Sun, Apr 4, 2010 at 8:55 PM, Brad bene...@yahoo.com wrote: I had always thought that with mpxio, it load-balances IO request across your storage ports but this article http://christianbilien.wordpress.com/2007/03/23/storage-array-bottlenecks/has got me thinking its not true. The