Resources http://www-03.ibm.com/systems/resources/systems_i_Virtualization_Open_Storage.pdf http://www.redbooks.ibm.com/redbooks/pdfs/sg247590.pdf Historical Number 550038605 Document information More support for: Virtual I/O Server Software version: 6.1.0 Operating system(s): IBM i Reference #: N1012518 Modified date: 19 May 2013 Site availability With AIX regardless of what multi-pathing software is in use, if a path fails, there will most likely be a pause in I/O processing What happens is at the time of VIOS setup 1. The command lspath will show the current paths.
Bookmark the permalink. ← Thin Provisioning BuyersGuide Knowledge sharing inIT → One Response to Don't always default todefault Pingback: Don’t always default to default | Aussie Storage Blog | I Love Configuring the AIX fast fail feature for use with Veritas Volume Manager (VxVM) and Dynamic Multipathing (DMP) Prev Performance monitoring and tuning Next Configuring the AIX fast fail feature for use To verify the settings have been changed successfully, do the following: lsdev –dev fscsiX –attr fc_err_recov lsdev –dev fscsiX –attr dyntrk Important Note: The SCSI reserve policy for each LUN (or EXTENDING A SHARED VG IN HACMP/ADDING A DISK IN SHARED VG IN HACMP , POWERHA EXTENDING VOLUME GROUP ALL DOCUMENT ARE PROPERTY OF SHIVAKANT , DO NOT COPY IBM , AIX http://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.performance/fast_fail_dynamic_interaction.htm
I have just one day, today, and I'm going to be happy in it. -Groucho Marx UNDERSTANDING fc_err_recov=fast_fail anddyntrk Posted: January 24, 2012 in Aix Advance Config, configuring fc in mpio, rmdev -pdev vhost1 2. However once multipath Fibre Channel became common, it made sense to allow more control over this behaviour. How to see all the managed system through hmc how to see all wwpn numbers from hmc How to see disks in Netapp storage how to see hmc events How to
Change the reserve for the lun / hdisk from both VIOS partitions. The following are different situation of these two attributes: 1. template. Remove the mappings of the lun/hdisk from both VIOS partitions so they are unmapped in both places.
chdev -dev hdisk3 -attr reserve_policy=no_reserve 3. Send to Email Address Your Name Your Email Address Cancel Post was not sent - check your email addresses! Constructive and useful comments are very very welcome. fc_err_recv=delayed_fail and dyntrk=no Default setting.
While it’s true that in many cases the default settings may cover the most common implementations, there is no guarantee of safety in leaving everything at defaults. Rotating 2. no track while AIX system dump in progress. In single-path configurations, especially configurations with a single path to a paging device or tape drive, the delayed_fail default setting is recommended.
So paths to tape drives or to paging devices should use delayed_fail, while paths to everything else should use fast_fail. click for more info After all fscsiX attributes have been set, restart VIOS. The change must be made prior to mapping the LUNs to IBM i, and it does not require a restart of VIOS. chdev -l fscsi0 -a dyntrk=yes -P (default is no) Requirement: device PWWN and NWWN must remain constant.
Skip to content HomeAbout me ← Thin Provisioning BuyersGuide Knowledge sharing inIT → Don't always default todefault Posted on May 30, 2014 by Anthony Vandewerdt I once sat in a project fast_fail and dyntrk are seprate features, however, change one of them might change the other. If you believe you won't, you most assuredly won't. TAKING BACKUP OF DATA VG USING SAVEVG COMMAND , HOW TO BACKUP A DATAVG IN AIX ALL DOCUMENT ARE PROPERTY OF SHIVAKANT , DO NOT COPY IBM , AIX , HACMP
With dyntrk disable, there is a big difference between "fast_fail" and "delayed_fail"; with dyntrk enable, there is less differnece. Powered by Blogger. Watson Product Search Search None of the above, continue with my search Redundant VIOS Support VIOS Technote (troubleshooting) Problem(Abstract) This document describes the requirements for setting up and configuring redundant VIOS Please manually run 'savebase' before rebooting.
The request cannot be fulfilled by the server The request cannot be fulfilled by the server United States English English IBM® Site map IBM IBM Support Check here to start device will only track from the same HBA. fc_err_recv=fast_fail and dyntrk=no If link loss between storage and switch, ater 15 seconds delay, FC drives will query the device again.
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Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are If no device, I/O flush back to adapter and I/O fail; if has device but scsi_id has changed,the FC driver will re-route traffic to new scsi_id. rmdev -pdev vhost1 (is what I used) You then need to change the reserve for the lun/hdisk from both vios partitions. CREATING AND EXTENDING A FILE SYSTEM IN HACMP , MANAGING FILE SYSTEMS IN POWERHA ALL DOCUMENT ARE PROPERTY OF SHIVAKANT , DO NOT COPY IBM , AIX , HACMP , ARE
This issue is not seen if the path is disabled from the host side. The default setting for this attribute is delayed_fail (which I call slow failure). You can instead set it to fast failure. This setting influences what happens when the adapter driver receives a message To show the current reserve policy settings: l sdev –dev hdiskX –attr reserve_policy To set the no_reserve attribute, if necessary: chdev –dev hdiskX –attr reserve_policy=no_reserve -perm If the 'no_reserve' is not Fast Failure of an I/O path is controlled by a fscsi device attribute called fc_err_recov.
Desirble for sing-path environement. 2. Map luns / hdisk to the clients. How to restore a corrupted inittab file in aix How to restore AIX mksysb image from a DVD how to restore hmc How to restore inittab file from mksysb tape in How to MAP LUN on V3700 how to migrate aix How to migrate aix from P6 to P7 How to migrate data from HP storage to IBM Storage How to migrate
Script to remove disk from PowerHA Script to remove file system in cluster Script to shut down all the lpars script to view lv and vg info SEA CONFIGURATION SEA 802.1Q Practical Guide for samba configuration practical sendmail configuration Processor Folding providing sudo access for a user as a specific user PTF AIX Recover from Mirrored disk failure recovering a file from This is because there is some overlap in dyntrk and fc_err_rec. Join 1,378 other followers Actifio Websites Actifio – Radically Simple Copy Data Management Actifio's Official Blog Actifio's YouTube Channel Michael Troiano's Blog AIX Related Blogs AIX – learn it and share
Use the lsattr command to verify that the dyntrk and fast_fail attributes are set to True on each adapter, as shown in this example: # lsattr -El fscsi0 attach switch How Feedjit Feedjit Live Blog Stats Labels /etc/iscsi/targets /usr/es/sbin/cluster/cl_crfs /usr/es/sbin/cluster/cl_rmfs 0453-054 Unable to get physical volume name for from ODM 0516-1734 mklvcopy: Warning 0516-934 /usr/sbin/syncvg: Unable to synchronize logical volume A new View all posts by Anthony Vandewerdt → This entry was posted in advice and tagged AIX, IBM AIX.