Comments on: FC NFS ISCSI http://malaysiavm.com/blog/fc-nfs-iscsi/ Sun, 20 May 2012 14:57:50 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: craig http://malaysiavm.com/blog/fc-nfs-iscsi/comment-page-1/#comment-488 craig Wed, 07 Jan 2009 15:21:25 +0000 http://malaysiavm.com/blog/?p=752#comment-488 HI James, some of your statement may be correct, but bear in mind, for performance and best practice to get the peak performance, we do not necessary to keep a big LUN in our environment. The more VMs per LUN will reduce the I/O performance from time to time. If you combine all in single datastore, it will also impact the performance as well as higher risk of the point of failure. 10Gbps are still not popular in the storage markets today, we will still yet to see the performance VS pricing always. You may need to consider the DISK device, Memory Disk for SAN will be common in another couple of years which will be 20 to 30 times faster than fiber disks, and that will really improved the I/O. 10Gbps not meant you will get full bandwidth through put, which will also require to consider the spindle power you have from the storage box, is a combination. HI James, some of your statement may be correct, but bear in mind, for performance and best practice to get the peak performance, we do not necessary to keep a big LUN in our environment. The more VMs per LUN will reduce the I/O performance from time to time. If you combine all in single datastore, it will also impact the performance as well as higher risk of the point of failure.

10Gbps are still not popular in the storage markets today, we will still yet to see the performance VS pricing always. You may need to consider the DISK device, Memory Disk for SAN will be common in another couple of years which will be 20 to 30 times faster than fiber disks, and that will really improved the I/O. 10Gbps not meant you will get full bandwidth through put, which will also require to consider the spindle power you have from the storage box, is a combination.

]]> By: James http://malaysiavm.com/blog/fc-nfs-iscsi/comment-page-1/#comment-481 James Mon, 05 Jan 2009 16:07:26 +0000 http://malaysiavm.com/blog/?p=752#comment-481 True, NFS is slower that FC because NFS requires that the storage host do some of the work (processing of information). However, as the number of VM's increase on your Volumes/LUNS, FC LUN storage gets saturated and actually slows down incomparison to NFS with a large number of VM's on a Volume/LUN. One way to improve the throughput of your NFS storage is to increase the network connection speeds from 1Gbps to 10Gbps or use the Xsigo VP780-X2 (20Gbps) to connect all your ESX hosts. This will DRAMATICALLY improve the testing of your NFS environment. True, NFS is slower that FC because NFS requires that the storage host do some of the work (processing of information). However, as the number of VM’s increase on your Volumes/LUNS, FC LUN storage gets saturated and actually slows down incomparison to NFS with a large number of VM’s on a Volume/LUN.
One way to improve the throughput of your NFS storage is to increase the network connection speeds from 1Gbps to 10Gbps or use the Xsigo VP780-X2 (20Gbps) to connect all your ESX hosts. This will DRAMATICALLY improve the testing of your NFS environment.

]]> By: craig http://malaysiavm.com/blog/fc-nfs-iscsi/comment-page-1/#comment-479 craig Mon, 05 Jan 2009 13:54:22 +0000 http://malaysiavm.com/blog/?p=752#comment-479 I do agree with your suggestion as I am also finding a way to tweak it further. But in normal case, even with 1Gb connection, we will not getting 100% of 1Gb always. Just as similar to 2Gb FC, I am only getting 1.5Gbps performance as is consider good actually. I do agree with your suggestion as I am also finding a way to tweak it further. But in normal case, even with 1Gb connection, we will not getting 100% of 1Gb always. Just as similar to 2Gb FC, I am only getting 1.5Gbps performance as is consider good actually.

]]> By: avanspronsen http://malaysiavm.com/blog/fc-nfs-iscsi/comment-page-1/#comment-478 avanspronsen Mon, 05 Jan 2009 13:00:39 +0000 http://malaysiavm.com/blog/?p=752#comment-478 You likely did not have proper network load balancing when you got 125MB/sec on NFS. It is a strange coincidence that your max NFS throughput is the max throughput of 1 Gig Ethernet. You likely did not have proper network load balancing when you got 125MB/sec on NFS. It is a strange coincidence that your max NFS throughput is the max throughput of 1 Gig Ethernet.

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