device-mapper (dm): working with multipath-tools. Part 1 Filed under: SCSI, Linux — admin @ 10:33 Device-mapper (hereafter, dm) is one of the best collection of device drivers that I have ever worked with. It brings high availability, flexibility and more to the Linux 2.6 kernel. Device-mapper is a Linux 2.6 kernel infrastructure that provides a generic way to create virtual layers of a block device while supporting stripping, mirroring, snapshots, concatenation, multipathing, etc. While many modules are built on top of device-mapper, the focus of this article is on multipath-tools. Note that I will be using the terms multipath, multipath-tools and dm-multipath interchangeably to signify the same package. Also note that dm-multipath is the name of the repackaged multipath-tools redistributed under Red Hat in their Advanced Server Linux distribution.
"There are number of discussions, blogs, and articles comparing Internet SCSI (iSCSI), Fibre Channel over Ethernet (FCoE), and Fibre Channel (FC). Many of them share a common belief that FCoE and FC are better suited as core data center storage area networks (SANs) and that iSCSI is ideal for Tier 2 storage or for SAN deployments in remote or branch office (ROBO) and small and medium business (SMB) environments. That is because iSCSI is characterized as “low-performing,” “lousy,” and “unpredictable.” In this blog I will tackle the misinformation around iSCSI performance as compared to FC and FCoE. I will also compare effective efficiency of the various SAN protocols since efficiency is an aspect of performance."
There is a buzz in the storage industry about iSCSI (Internet Small Computer Systems Interface), which is the protocol that transports SCSI commands and data over an Ethernet/IP network. As a result, we’ve had some requests for practical guidance on pla
With Fibre Channel too expensive for most customers, the Internet Small Computer Systems Interface (iSCSI) protocol is poised to become the standard for architecting dedicated storage solutions. Small-to-medium businesses (SMBs) and enterprise customers alike should prepare for the inevitable adoption of iSCSI by encouraging their information technology staff to learn how to install and configure iSCSI today.
I thought I'd kick off my Citrix blog with a question I get pretty often from Linux enthusiasts: how to install unsupported Linux distributions on XenServer 4.1.