Important for RSCNs to get through to the devicefor example, with a zoning change or the addition of a It works by intercepting RSCNs generated by initiators (servers) on I/O Stream GuardĮnabled ports and stops them from being transmitted to other I/O Stream Guard enabled ports. I/O Stream Guard was developed by QLogic to assist the video markets requirement for uninterrupted Used to intelligently manage interruptions caused by RSCNs. Continuous sequential data flow is impacted by an event called a Registered StateĬhange Notification (RSCN) when it comes from a device other than a storage target. Specifically in sequential data applications such as streaming media for video/audio and backup ofĬentralized storage. I/O Stream Guard is a QLogic feature that addresses the problem of guaranteeing uninterrupted data flow, Qlogic provides an excellent PDF regarding their switches & Xserve RAID & Xsan (google search for "SN0054606-00D") discusses the issue: Some also disable the 'Device Scan' on initiator ports. Enabled for initiators (host) disabled for targets (storage). Review the Streamguard settings on the target/initiator ports. Here is a screenshot showing the recommended settings, from an Apple Engineer Contact Apple for further information on this issue. 4) Make sure you have plenty of RAM in your RAID subsystems and your XSan metadata controllers.Ĭontact Apple for further information on this issue.ĥ) Make sure that Host Cache Flushing is turned OFF on your Raid subsystems, otherwise you may periodically drop frames. Try reconfiguring and reinitialising your XSan according to Apple documentation and guidelines. Contact Apple or QLogic for further information on this issue.ģ) The configuration in which the XSan is initialised can make a huge difference to the performance and reliability in specific operations. This should help with dropped frames, especially ones that correspond with a reboot of another CPU on the fibre. Contact Apple for further information on this issue.Ģ) If you use QLogic switches, you need to ENABLE I/O Streamguard and DISABLE device scan on specific ports.
This problem should not affect current versions of XSan. This may help with aborted recordings, or file corruption. Please check the following:ġ) In some older versions of XSan, A Dual fibre connection between the card and the switch is not reliable in some cases. Most XSan issues seem to revolve around dropped frames, or aborted recordings, or corrupt files. To check that the problem is related to storage, try capture/playback etc using your internal local hard drives instead of the XSan. If not, then please visit our ' Where to now ?' page to find XSan technical support. However we have listed some of the most common issues below (as reported to us by 3rd parties) in case this helps you. Gallery cannot provide technical support for your Apple XSan problems.
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