StorageSecrets.org

Here are some examples of scripts that I have written using the command-line engine in smartmon-ux.

Emulate the typical LED and alarms one would see with a hardware-based RAID controller so an appliance that uses software-based RAID has same look-and feel …

• Sound the audible alarm once mdstat indicates a logical disk becomes critical.
• Light the FAULT LED
• Query the O/S to find out the surviving disks, then set them to blink. This way user knows what disks are being rebuilt.
• Use the ID LED to indicate which hot spare the O/S chose to rebuild the LUN with.

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Diagnostics, Enclosure Management, SES Enclosure Management, SES

The ANSI SCSI Enclosure Services (SES-2) specification can be downloaded here.

Enclosure Management, SES Downloadable ANSI Specs, SES, Specifications

Below is a  dump from a Xyratex SES compliant enclosure, using SANtools smartmon-ux software.  Portions in blue are vendor-specific.

root@morph smartmon]# ./smartmon-ux -E+ /dev/sdc
SMARTMon-ux [Release 1.23, Build 30-NOV-2003] - Copyright 2003 SANtools, Inc. http://www.SANtools.com SEAGATE ST336753FC S/N "3HX00LE3" on /dev/sdc [SES] (Not Enabling SMART)(35003 MB)
Discovered XYRATEX  RS1600-FC2-FFX2  WWN=20-00-00-50-CC-00-7B-8E:
Configuration switches numbered from 1-12 as viewed from rear, top to bottom
Vendor-specific features (Notes) [SWITCH SETTING]
SoftSelect Mode             (Disabled) [SW11-OFF]
Drive Speed                 (2 Gbit FC Mode)

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Enclosure Management, SES Enclosure Management, SES

SCSI Enclosure Services, referred as SES or SES-2, depending on the revision level, is a command set that is used to manage and sense the state of the power supplies, cooling devices, displays, indicators, individual drives, and other non-SCSI elements installed in a fibre channel or SAS (host-attached) enclosure.  Intelligent enclosures that connect to the host via a SCSI cable will normally speak the SAF-TE protocol.

The command set is defined as an ANSI specification, and utilizes the SCSI commands to obtain configuration information for the enclosure as well as reprogram it to light external indicator LEDs or audible alarms to inform the user about the health and maintenance information for attached RAID controllers and disk drives.

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Configuration, Diagnostics, Enclosure Management, Firmware, SES Enclosure Management, SES

Yes - SES, which stands for SCSI ENCLOSURE SERVICES, is the ANSI standard by which Fibre Channel-attached subsystems adhere to.  SCSI enclosures “speak” SAF-TE, which stands for SCSI Accessed Fault Tolerant Enclosures.

The SES specification has a great deal of intelligence, which allows for not only reporting health, but changing fan speeds, manipulating the LEDs, and controlling audible alarms.   SAF-TE is a rather dumb interface that reports the most basic information in more of a pass/fail form.

Enclosure Management, SAF-TE, SES Enclosure Management, SAF-TE, SES