Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13
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Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13
by Halomoan Chow
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Hi folk,
Just a quick question, I want to run Microsoft Cluster (MSCS) with shared disk in iSCSI technology. Is it ok to run it on the latest IET 0.4.13, since I heard about Release/Reserve (RR) command issue in MSCS and iSCSI Target and data corruption without proper RR support. Thank you Regards, Halomoan PowerE2E Shanghai DID : +86 21 62748228 Extension 302 Fax: +86 21 62749118 www.powerE2E.com ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Iscsitarget-devel mailing list Iscsitarget-devel@... https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel |
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RE: Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13
by ming zhang-2
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agree.
ming On Fri, 2006-04-21 at 08:45 -0400, Shane Cribbs wrote: > First of all, yes it will work. Secondly, it appears that many are > concerned about data consistency in the event of a node failure. I've > setup a MSCS cluster using IET for the cluster disks without any > problems. My next task is to simulate several failure scenarios to see > just how stable this can be. > > In short, great for testing or learning, but I don't think I'd put it in > production yet. > > Anyone who has a correction or other opinion, please feel free to > correct or add to this. > > Shane > > -----Original Message----- > From: iscsitarget-devel-admin@... > [mailto:iscsitarget-devel-admin@...] On Behalf Of > Halomoan Chow > Sent: Friday, April 21, 2006 12:26 AM > To: iscsitarget-devel@... > Subject: [Iscsitarget-devel] Microsoft Initiator 2.0 and Cluster (MSCS) > with IET 0.4.13 > > Hi folk, > > Just a quick question, > > I want to run Microsoft Cluster (MSCS) with shared disk in iSCSI > technology. > > Is it ok to run it on the latest IET 0.4.13, since I heard about > Release/Reserve (RR) command issue in MSCS and iSCSI Target and data > corruption without proper RR support. > > Thank you > > Regards, > > Halomoan > PowerE2E Shanghai > DID : +86 21 62748228 Extension 302 > Fax: +86 21 62749118 > www.powerE2E.com > > > > > ------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, > security? > Get stuff done quickly with pre-integrated technology to make your job > easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache > Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Iscsitarget-devel mailing list > Iscsitarget-devel@... > https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel > > > ------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 > _______________________________________________ > Iscsitarget-devel mailing list > Iscsitarget-devel@... > https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Iscsitarget-devel mailing list Iscsitarget-devel@... https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel |
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RE: Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13
by Juhani Rautiainen-2
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On Fri, 21 Apr 2006, Shane Cribbs wrote:
> First of all, yes it will work. Secondly, it appears that many are > concerned about data consistency in the event of a node failure. I've > setup a MSCS cluster using IET for the cluster disks without any > problems. My next task is to simulate several failure scenarios to see > just how stable this can be. > > In short, great for testing or learning, but I don't think I'd put it in > production yet. > > Anyone who has a correction or other opinion, please feel free to > correct or add to this. Only time when real corruption can happen is when you have nodes in cluster who don't see each other. One way to make sure that this won't happen is put heartbeat on every network connection and that includes connection to iscsi target (there might be small performance penalty for this). Here's scenario what happens when you don't do that: There are two cluster clients A and B with two network connections: one dedicated to iscsi target connection and one dedicated for heartbeat and cluster client connections. 1) Client A is active node in cluster and thinks it has reservation 2) Client B doesn't see client A (switch failure or either of heartbeat network adapters failed). 3) Client B does reserve on target and this succeeds. Client B also "knows" that is sole owner of the disk. 4) Possible KABOOM. You have two clients who think that they are sole owners of the disk. This scenario won't happen if you have heartbeat on iscsi target connection. Client B would see that client A is still alive. > Shane Juhani -- Juhani Rautiainen jrauti@... ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Iscsitarget-devel mailing list Iscsitarget-devel@... https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel |
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RE: Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13
by Halomoan Chow
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It sounds scary. :( I found SCST: Generic SCSI Target Middle Level for Linux (http://scst.sourceforge.net) that already support RR command. But it currently has interface only with UNH-iSCSI Target project (http://unh-iscsi.sourceforge.net). I think I'm going to look on it for the Windows clustering. I hope IET has a plan to support this feature in the future also. Thank you all for the response. Regards, Halomoan -----Original Message----- From: iscsitarget-devel-admin@... [mailto:iscsitarget-devel-admin@...] On Behalf Of Juhani Rautiainen Sent: Saturday, April 22, 2006 4:44 PM To: Shane Cribbs Cc: Halomoan Chow; iscsitarget-devel@... Subject: RE: [Iscsitarget-devel] Microsoft Initiator 2.0 and Cluster (MSCS) with IET 0.4.13 On Fri, 21 Apr 2006, Shane Cribbs wrote: > First of all, yes it will work. Secondly, it appears that many are > concerned about data consistency in the event of a node failure. I've > setup a MSCS cluster using IET for the cluster disks without any > problems. My next task is to simulate several failure scenarios to see > just how stable this can be. > > In short, great for testing or learning, but I don't think I'd put it in > production yet. > > Anyone who has a correction or other opinion, please feel free to > correct or add to this. Only time when real corruption can happen is when you have nodes in cluster who don't see each other. One way to make sure that this won't happen is put heartbeat on every network connection and that includes connection to iscsi target (there might be small performance penalty for this). Here's scenario what happens when you don't do that: There are two cluster clients A and B with two network connections: one dedicated to iscsi target connection and one dedicated for heartbeat and cluster client connections. 1) Client A is active node in cluster and thinks it has reservation 2) Client B doesn't see client A (switch failure or either of heartbeat network adapters failed). 3) Client B does reserve on target and this succeeds. Client B also "knows" that is sole owner of the disk. 4) Possible KABOOM. You have two clients who think that they are sole owners of the disk. This scenario won't happen if you have heartbeat on iscsi target connection. Client B would see that client A is still alive. > Shane Juhani -- Juhani Rautiainen jrauti@... ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Iscsitarget-devel mailing list Iscsitarget-devel@... https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Iscsitarget-devel mailing list Iscsitarget-devel@... https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel |
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