Archive for 'Storage Area Networking'

A completely (local) diskless datacenter with iSCSI

Being able to boot a machine from SAN isn’t exactly a new concept.  Instead of having local hard drives in thousands of machines, each machine logs into the fabric and boots the O/S from a LUN exported via fiber on the SAN.  This requires a little bit of configuration on the Fiber HBA, but it […]

Configuring Brocade switches to log to syslog

I manage a number of Brocade switches, and periodically they encounter hardware problems (bad SPFs, faulty cables, etc.). To ensure that I am notified when these problems occur, I like to configure the switches to log errors to a centralized syslog server. Configuring a Brocade switch to use syslog is as simple as running the […]

Viewing port utilization on Brocade switches

The Brocade Silkworm family of switches maintain a number of important performance and reliability counters for each switch port. Performance and reliability counters for specific switch ports can be viewed with the porterrshow, portshow and portStatsShow commands. To view system wide throughput statistics, the portPerfShow command can be run with an optional interval: switch1:admin> portPerfShow […]

Backing up Brocade switch configurations

Brocade switches have become one of the most widely deployed componets in most Storage Area Networks (SANs). One thing that has led to Brocade’s success is their robust CLI, which allow you to view and modify almost every aspect of their switch. This includes zoning configurations, SNMP attributes, domain ids, switch names and network addresses, […]

iSCSI security

While perusing the Blackhat media archives I came across Himanshu Dwivedi’s iSCSI security presentation. This is not only a great introduction to the concepts behind iSCSI, but also discusses some of the wekanesses in the iSCSI protocol. This is a great read!

Getting Emulex adaptors working with Solaris

This past week I wanted to use the Solaris cfgadm utility to unconfigure a few LUNs. When I ran ‘cfgadm -al’, I noticed that the FC adaptors were not visible in the cfgadm output: $ cfgadm -al Ap_Id Type Receptacle Occupant Condition c2 scsi-bus connected configured unknown c2::dsk/c2t0d0 CD-ROM connected configured unknown usb0/1 unknown empty […]

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