{"id":100,"date":"2010-12-31T00:00:18","date_gmt":"2010-12-30T22:00:18","guid":{"rendered":"http:\/\/www.data-protector.org\/wordpress\/?p=100"},"modified":"2015-12-10T19:54:28","modified_gmt":"2015-12-10T18:54:28","slug":"disable-device-polling","status":"publish","type":"post","link":"https:\/\/www.data-protector.org\/wordpress\/2010\/12\/disable-device-polling\/","title":{"rendered":"Disable Device Polling"},"content":{"rendered":"<p>In the article <a href=\"https:\/\/www.data-protector.org\/wordpress\/2010\/12\/was-ist-eigentlich-device-polling\/\">&#8220;What is device polling&#8221;<\/a>  I described what device polling is and what can happen to your backup when polling occurs. I now describe how device polling can be prevented or eliminated.<br \/>\nThe following is valid for HP hardware only. If you need to use Data Protector on F*****, I** or D*** servers, please refer to the documentation of your hardware verndor.<br \/>\nAs a common rule deactivate device polling on all servers sharing the SAN with library or tape devices. Servers which must not see tape devices or libraries should be removed from zoning used by your tape devices and libraries. If possible use 1:1 zoning. For MSL 6000 libraries create an empty indexed map to prevent new servers to automatically zoned to your devices. Create a separate map on your NSR.<\/p>\n<ul>\n<li>Deactivate network scanners: NMAP or 3com Network Director is known to send data to the NSR, which may lead to a reboot of the NSR. Do scans after the backup is done.<\/li>\n<li>In Windows the so called TUR commands are sent on the SCSI bus periodically (Windows 2000 &#8211; every 3 seconds, Windows 2003, every second). This behaviour starts immediatley when you install a new server with SAN attached. This applies also for Windows 2008 when the removable stroages service is installed as an additional feature (not default). As a general advise deactivate removable stroages service  and disable TUR on tape devices (see below). Microsoft release article KB842411: <a href=\"http:\/\/support.microsoft.com\/default.aspx?scid=kb;en-us;842411\">http:\/\/support.microsoft.com\/default.aspx?scid=kb;en-us;842411<\/a>. Additional hint: If you deactivate a server to be used for new applications, make sure you remove this server from zoning as polling will occur immediately when you install the server.<\/li>\n<li>For HP LTO drives install the latest driver version as an old version (1.0.3.0) has polling activated within the install file. In general the following Regkey must be created for each drive you have (drive type &#8211; hplto, hpdlt, &#8230;), when donw restart the server. Sometime it might be necessary to reboot the NSR as well. The steps must also be done for the robotic control (libxprmc, hpmc or hpuln32).\n<ul>\n<li>HKLM\\SYSTEM\\CurrentControlSet\\Services\\hplto<\/li>\n<li>Create new DWORD, AutoRun, Value=0<\/li>\n<\/ul>\n<\/li>\n<li>Insight Management Agents can send requests to tape devices to recognize errors with your tapes. In control panel open HP Management Agents, navigate to tab Storage and select &#8220;Disable Fibre Agent Tape Support&#8221;.<\/li>\n<\/ul>\n<p>On Unix device polling is also a problem:<\/p>\n<ul>\n<li>For HP-UX 11.23 (v2) you have to set the kernel parameter st_san_safe &#8211;&gt; <code>kctune st_san_safe=1<\/code><\/li>\n<li>On HP-UX 11.31 (v3) there is a new parameter to prevent device polling, patch PHKL_36312 is a requirement:\n<ul>\n<li>Change the parameter: <code>scsimgr set_attr -d estape -a norewind_close_disabled=1<\/code><\/li>\n<li>Save the parameter: <code>scsimgr save_attr -d estape -a norewind_close_disabled=1<\/code><\/li>\n<li>Check the parameter: <code>scsimgr - estape get_attr<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>And what can you do in addition? Empty the traces log on the NSR and check how many entries are written when no backup is running. When device polling occurs you will notice a lot of messages per second here.<\/p>\n<p>Comment: Polling will still happen, but not with the problems described above. When running &#8220;ioscan&#8221; on HP-UX or &#8220;search for changed hardware&#8221; on Windows or when running LTT, you might still see some device polling, but this is a normal level.<\/p>\n<p>And last comment as I talked about it&#8230; LTT (when used in current version) can document which HBA did TUR, with a good SAN documentation it is very easy tio identify the host which does polling on your devices. LTT can be downloaded here: (Did you know that LTT is available for Netware? &#8211; I&#8217;m a Master CNE&#8230;)<a href=\"http:\/\/h20000.www2.hp.com\/bizsupport\/TechSupport\/DriverDownload.jsp?lang=de&amp;cc=de&amp;prodNameId=406731&amp;taskId=135&amp;prodTypeId=12169&amp;prodSeriesId=406729&amp;lang=de&amp;cc=de\">http:\/\/h20000.www2.hp.com\/bizsupport\/TechSupport\/DriverDownload.jsp?lang=de&amp;cc=de&amp;prodNameId=406731&amp;taskId=135&amp;prodTypeId=12169&amp;prodSeriesId=406729&amp;lang=de&amp;cc=de<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the article &#8220;What is device polling&#8221; I described what device polling is and what can happen to your backup when polling occurs. I now describe how device polling can be prevented or eliminated. The following is valid for HP hardware only. If you need to use Data Protector on F*****, I** or D*** servers, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"spay_email":""},"categories":[11],"tags":[45,46,55],"translation":{"provider":"WPGlobus","version":"2.8.8","language":"en","enabled_languages":["en","de"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"de":{"title":false,"content":true,"excerpt":false}}},"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p28cjj-1C","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":87,"url":"https:\/\/www.data-protector.org\/wordpress\/2010\/12\/was-ist-eigentlich-device-polling\/","url_meta":{"origin":100,"position":0},"title":"What is device polling","date":"31. December 2010","format":false,"excerpt":"{:de}Bestimmt jeder Data Protector Kunde mit einer Fibre Channel Tape Library hat dieses Problem schon mal wissentlich oder unwissentlich erlebt: ein SCSI Reset w\u00e4hrend einer Sicherung... und das ganze Band ist zerst\u00f6rt. Was war passiert? Das Bandlaufwerk wurde mit\u00a0SCSI Kommandos \u00fcbersch\u00fcttet - das nennt man auch Device Polling. Polling ist\u2026","rel":"","context":"In &quot;Common&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":126,"url":"https:\/\/www.data-protector.org\/wordpress\/2010\/08\/enhanced-automated-disaster-recovery\/","url_meta":{"origin":100,"position":1},"title":"Enhanced Automated Disaster Recovery","date":"6. August 2010","format":false,"excerpt":"{:en}No translation for this article available.{:} {:de} Immer wieder mal ben\u00f6tigt man es wenn ein Server komplett den Bach runter geht... \u00a0In der Regel sollte man vor einem Disaster wissen wie man seine Server wieder herstellt. In den Unterlagen von HP ist zwar sehr sch\u00f6n und ausf\u00fchrlich beschrieben welche einzelnen\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2948,"url":"https:\/\/www.data-protector.org\/wordpress\/2016\/03\/set-data-protector-smart-cache-power-live-migrate\/","url_meta":{"origin":100,"position":2},"title":"How to set up Data Protector to use Smart Cache for Power On and Live Migrate","date":"8. March 2016","format":false,"excerpt":"{:en} With HPE Data Protector you have advance VM recovery functionality when backing up using either a 3Par or Smart Cache device. To give you some background on why this is the supported method is due to the flow\/process that Data Protector uses when doing this type of recovery. Once\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2042,"url":"https:\/\/www.data-protector.org\/wordpress\/2014\/07\/physical-tape-vs-virtual-tape\/","url_meta":{"origin":100,"position":3},"title":"Physical Tape vs. Virtual Tape","date":"13. July 2014","format":false,"excerpt":"{:en}In a modern Backup & Recovery infrastructure backup-to-disk solutions are used very often. But many customers need to look at capex and opex. With the implementation of modern deduplication technologies these expenses can be decreased very easily. However, to save money, you have to follow some rules, otherwise the backup-to-disk\u2026","rel":"","context":"In &quot;Common&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4128,"url":"https:\/\/www.data-protector.org\/wordpress\/2018\/05\/data-protector-10-patch-bundle-a-10-04-build-182\/","url_meta":{"origin":100,"position":4},"title":"Data Protector 10 \u2013 Patch Bundle A.10.04 (Build 182)","date":"23. May 2018","format":false,"excerpt":"{:en}The Patch Bundle A.10.04 (Build 182) for Data Protector 10 has been released on May 22, 2018. Data Protector A.10.03 was released as a full install therefore the cumulative patch 10.04 can only be installed on top of A.10.03. A direct upgrade from A.10.00, A.10.01 or A.10.02 is not possible!\u2026","rel":"","context":"In &quot;DP A.10.00&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1365,"url":"https:\/\/www.data-protector.org\/wordpress\/2013\/05\/ipc-invalid-packet-size\/","url_meta":{"origin":100,"position":5},"title":"IPC Invalid Packet Size","date":"8. May 2013","format":false,"excerpt":"{:en}After the upgrade to DP 7.01 in some environments the rarley error IPC Invalid Packet Size has been seen while accessing a changer or tape device. The problem might be related to a slow name resolutuion on the media agent. The INET may run into a timeout before sending data\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/100"}],"collection":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/comments?post=100"}],"version-history":[{"count":14,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/100\/revisions"}],"predecessor-version":[{"id":2854,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/100\/revisions\/2854"}],"wp:attachment":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/media?parent=100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/categories?post=100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/tags?post=100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}