Microsoft iSCSI Initiator简化了SAN访问

正如我在之前的博客中提到的，我正在使用iSCSI测试对虚拟SAN的访问。iSCSI是一种相对较新的技术，它允许通过TCP/IP访问SAN。让我们看看……存储区域网络传统上使用快速可靠的光纤通道交换(FC-SW)架构。非常快，非常可靠，而且非常昂贵。这取代了最大规格为25米的旧SCSI电缆。如有必要，穿越城市的光纤电缆最高可达10公里。非常昂贵。您的服务器将需要一个HBA(主机总线适配器)、光纤交换机和电缆来形成主机服务器和SAN之间的“Fabric”。光纤通道有效地传输SCSI命令，并使服务器误以为SAN是在本地连接的。 Now with the advent of the open iSCSI protocol, we can use existing TCP/IP networks to transport SCSI commands even over the internet. This may not be as fast or as reliable as Fibre but it certainly is cheaper and you may be surprised how close the performance comes using Gigabit Ethernet adapters. You can use the software-based Microsoft iSCSI "Initiator" which allows you to connect to a "Target" LUN on the SAN that will access many spindles for performance and redundancy. Your server just sees the disk as another drive and again is fooled into thinking it is local even though it may be many miles away. The SAN provides all the RAID features you would need along with extra memory, CPU and caching. All transparent to the host server. The SAN will also do background replication and snapshots if you wish, independent of SQL Server. If you need extra performance, it is recommended to go with a hardware based iSCSI HBA on the host server since this will take the strain off the host server's CPU given the extra TCP/IP processing but the software initiator works just fine for testing SAN access. Microsoft iSCSI Software Initiator Version 2.08 Download: http://www.microsoft.com/downloads/details.aspx?familyid=12cb3c1a-15d6-4585-b385-befd1319f825&displaylang=en cheers Brian