The supported configuration varies somewhat, depending on the underlying hypervisor used by the vms. Validate that storage supports the scsi3 persistent reservation commands. Neither openfiler, nor freenas seems to support this feature yet. Issuing persistent reservation register and ignore existing for test disk 1 from node hyperv04. Any fencing to be effective needs to not just keep the dog in, but also the kangaroo that jumps over it and the groundhog that burrows under it. Previous deep dive posts have dealt with performance issues or faulty hardware.
I think that in windows 2012, theres something different regarding scsi3 persistent reservations. Scsi3 prs native support enables customers to create a new or move an existing windows server failover cluster wsfc with up to 6 nodes and 64 shared disks to vmware vsan. Installation of opene dss on vmware workstation for shared storage in unix supported for scsi3 persistent reservation opene data storage software v7 is a linuxbased data storage software used for building and managing centralized data storage servers nas and san. Note that sharing virtual disks backed by vvols as described above has always been supported the work in 6. Apr 15, 2009 not all the iscsi disks can do it, because it needs scsi 3 persistent reserve features, you can try kernsafe iscsi target, here is an article gives you detailed stepbystep instructions on configuring windows server 2008 or windows server 2008 r2 failover clusters. Jan 09, 2015 if the storage array is not configured correctly to support scsi 3 compliant commands. What are scsi reservations and scsi persistent reservations. Welcome to vmware knowledge base log in with your my vmware credentials. If the need arises to block access to a device because of data integrity concerns, only one host and one path remain active. Hi all, i am trying to implement io fencing on my vmware test setup using centos 5. For esxi, nutanix requires the use of acropolis block services abs, where nutanix storage is presented directly to vms using the iscsi protocol. Scsi3 reservations are persistent across scsi bus resets and support multiple paths from a host to a disk. Validate scsi3 persistent reservation vmware communities.
Using microsoft cluster services for virtual machine clustering. The sad side is that, we cant use these luns in veritas cluster io fencing or redhat cluster fencing due to incompatibility of scsi3 persistent reservation. This has to do with a limitation on the number of scsi 3 pr persistent reservations that can be assigned per port on a storage device. Failover clustering conducts scsi 3 reservations on shared disks. Scsi 3 persistent reservations also support multiple paths from host to disk whereas scsi 2 reservations do not and could only work with a single path to the lun. We appreciate your interest in having red hat content localized to your language. When running the failover cluster validation report on an existing cluster configured in windows server 2008 or windows server 2008 r2, the scsi 3 persistent reservation test may fail with the following error. Here you can provide suggestions on how to improve the product, website, etc. Validate scsi3 persistent reservation trying to set up a windows 2008 r2 failover cluster accross hosts on vsphere. Please note that excessive use of this feature could cause delays in getting specific cont.
Oct 16, 2014 in playing around recently in my home vmware lab, i set about created a windows server 2012 r2 cluster with iscsi storage. After some research, i found out that a cluster using iscsi disks, iscsi target must support persistent reservation. Scsi3 prs native support enables customers to create a new or move an existing windows server failover cluster wsfc with up to 6 nodes and 64 shared disks to vmware cloud on aws. L readkeys reads the reservation keys registered with a lun. Dont download content unless you are sure of the publishers identity and trustworthiness. This is important to protect other machines from accessing the disk and corrupting the data on the disk. This is possible with the addition of scsi 3 persistent reservations scsi 3 pr support in vsan 6. However, the reservations only work for iscsi disks and dont work for vbox shareable disks. Jan 29, 20 this appears to be a big problem because scsi 3 persistent reservations are very important to the cluster working correctly. Jun 20, 2016 im trying to build a virtual environment for a db cluster that requires a shared scsi device to support pr persistent reservation commands. The reservation holding initiator releases the target reservation, using its key. How to install freenas on vmware workstation 8 electric monk. When running the failover cluster validation report on an existing cluster configured in windows server 2008 or windows server 2008 r2, the scsi3 persistent reservation test may fail with the following error.
Scsi3 persistent reservations scsi3 prs native support on vmware cloud on aws. I bought a ts239 pro ii which supposedly supports the scsi3 persistent reservation needed to make 2008 clustering work, but in my case it doesnt work. The book offers guidance and insight into implementing vmware vsphere 4. While most legacy applications can function using the reserverelease commands, some newer applications, notably windows 2008 cluster, require spc scsi primary command 3 persistent reservation pr commands to function properly. I would avoid using openfiler if you want to test setting up windows 2008 and windows 2008 r2 clusters as openfiler does not support scsi3 persistent reservation disks but freenas supports scsi3 persistent reservation disks. A pr is a scsi command, which clustering uses to protect luns. If you search persistent reservation from internet, we can see couple of articles provided by various storage company. We had been using this same model of array in our windows server 2008 r2 clusters so we knew that the p2000 support scsi3 persistent reservations. User account menu what is scsi 3 persistent reservation.
Upon completing the firmware update and bringing them back online. Windows 2012 cluster on p6300 scsi3 persistent reservation. The initiator registers a reservation key with the target. Installation of opene dss on vmware workstation for. Trying to setup a server 2008 r2 cluster on vmware. How to configure an iscsi target that supports the scsi3. Windows 2008 failover cluster validation fails on validate. Was setting this up in our test esx cluster which only has 2 nodes. Not all the iscsi disks can do it, because it needs scsi3 persistent reserve features, you can try kernsafe iscsi target, here is an article gives you detailed stepbystep instructions on configuring windows server 2008 or windows server 2008 r2 failover clusters. Scsi3 persistent group reservations tutorial updated dec 17, 2012 1. In contrast, only one host can use scsi2 reservations with one path. Highly available sql server workloads on vmware cloud on aws. Gentlemen, i am not familair with the hp p2000 but i had a similar situation with the hp xp24000. If virtual machines are running under the mscs configuration on two separate esxesxi hosts, and the.
Each path, each node in a cluster gets a pr for each lun assigned. How to configure scsi 3 persistent reservation on tgtd. I had read a blurb from someone that they had used nappit and they had verified it will pass the scsi3 persistent reservation test. The initiator reserves the target using its reservation key for either exclusive access nobody else can read nor write to the device or write exclusive nobody else can write to the device.
Microsofts windows server failover cluster wsfc is the most common example. The picture below shows you an extract of the validation tool report. Scsi 3 registration sent down one path allows the cluster to do scsi 3 reservations only on that path. Aug 07, 2012 this blog explains how you can install freenas on vmware workstation virtual machine to enable iscsi target disks. Jan 09, 20 validate scsi 3 persistent reservation description. As you can see, the report clearly specify that disk does not support persistent reservation. Attach your iscsi storage to each node in your hyperv failover cluster. We had been using this same model of array in our windows server 2008 r2 clusters so we knew that the p2000 support scsi 3 persistent reservations. Applies to scsiiii persistent group reservation functionality. Instead of using scsi2 reservations, clustering uses scsi3 persistent reservations, which removes the need for the dsm to handle translations. Products sold prior to the november 1, 2015 separation of hewlettpackard company into hewlett packard enterprise company and hp inc. This is possible with the addition of scsi3 persistent reservations scsi3 pr support in vsan 6. Jun 07, 2012 this entry was posted on june 7, 2012 at 5. This appears to be a big problem because scsi3 persistent reservations are very important to the cluster working correctly.
In the past, there were issues if it was used with virtual machines that didnt do a lot of iops, but that was resolved in vsphere 4. I run windows 2008 r2 64bit virtual machines on the nodes. You can remove scsi3 reservations for the quorum disk on the netapp controller using the. Customer performed a firmware upgrade to their ibm svcs. I have used many products over the years as opensource nas appliances such as openfiler and others out there. Validate scsi3 persistent reservation failed windows 2008 sp2 cluster across box clustered virtual disk. Has anyone used starwind for scsi3 persistent reservation. But if you already looked into this msdn blog article, i assume you are seeking something inside the host os. Vmware paravirtual aka pvscsi this vscsi controller is virtualization aware and was been designed to support very high throughput with minimal processing cost and is therefore the most efficient driver. Windows server 2012 failover cluster validation fails on. Cluster in a box should be on the same host affinity rule. Scsi3 persistent reservations also support multiple paths from host to disk whereas scsi2 reservations do not and could only work with a single path to the lun.
This support is for physical or virtual wsfc nodes. Jul 14, 2010 this has been changed in vmware vsphere, which now allows scsi 3 reservations and the use of the storport drivers. Setup for failover clustering and microsoft cluster service. When a lun is reserved, no other computers on the san can access the disk, except the ones cluster controls. Other initiators must coordinate with the reservation holder to access the target. Failover clustering conducts scsi3 reservations on shared disks. This blog explains how you can install freenas on vmware workstation virtual machine to enable iscsi target disks. What is persistent reservation from os perspective shen. Note this is not a guide to using microsoft cluster service or failover clustering. Nov 12, 20 the sad side is that, we cant use these luns in veritas cluster io fencing or redhat cluster fencing due to incompatibility of scsi3 persistent reservation. A thirdparty plugin is interfering with the scsi reservation process such as the powerpathve psa.
Cluster across box should be on separate hosts anti affinity. Download vmware nsxt data center for relatively free. I would avoid using openfiler if you want to test setting up windows 2008 and windows 2008 r2 clusters as openfiler does not support scsi 3 persistent reservation disks but freenas supports scsi 3 persistent reservation disks. Intended audience this information is for system administrators who are familiar with vmware technology and microsoft cluster service. Scsi 3 persistent group reservations tutorial updated dec 17, 2012 3. Configuring microsoft cluster service fails with the.
Solutions providers can learn about saving their customers hardware costs during implementation, how to partition a server into several virtual machines and. I create an iscsi lun on the ts239 and present it to the nodes. Scsi3 registration sent down one path allows the cluster to do scsi3 reservations only on that path. The reset clears any reservation on all the luns accessible through the bus and makes them available to all servers again. Mar 11, 2016 installation of opene dss on vmware workstation for shared storage in unix supported for scsi3 persistent reservation opene data storage software v7 is a linuxbased data storage software used for building and managing centralized data storage servers nas and san. Many clustered applications require scsi3 persistent reservation scsi3 pr to be able to share disks between nodes in the cluster application.
Scsi3 persistent reservations supports multiple nodes accessing a device while at the same time blocking access to other nodes. The real purpose of persistent reservations i prefer writing a reservation block or force flushed file rather than relying on t10 prevent splitbrain from getting worse than it already is. Validating test disk 1 for persistent reservation support. I just built out a freenas server explicitly for my hyperv failover cluster after finding that the commonlyused iscsitarget package is not scsi3 compliant, and freenas does work. May 10, 2012 previous deep dive posts have dealt with performance issues or faulty hardware.
I think that in windows 2012, theres something different regarding scsi 3 persistent reservations. Validate scsi 3 persistent reservation richardson porto mar 10, 2019 12. So feel free to ask questions, post blogs, share articles and other things. Using microsoft cluster services for virtual machine. Scsi3 persistent reservation ts239 pro ii qnap nas.
This chapter excerpt on ensuring high availability and business continuity download pdf is taken from the book mastering vmware vsphere 4. Determining root cause for a scsi reservation conflict. Or the hp dsm for windows 2012 is not quite stable yet. Openfler iscsi san4v will honor initiator pr commands where necessary. Scsi3 pr, which stands for persistent reservation, supports multiple nodes accessing a device while at the same time blocking access to other nodes. This has to do with a limitation on the number of scsi3 pr persistent reservations that can be assigned per port on a storage device.
This requirement is one of the primary reasons customers are still using rdms. Shared storage for windows server failover clusters on. Setup for failover clustering and microsoft cluster service covers esxi and vmware vcenter server. Scsi3 pr reservations are persistent across scsi bus resets or node reboots and also support multiple paths from host to disk. Im trying to build a virtual environment for a db cluster that requires a shared scsi device to support pr persistent reservation commands. Sql server cluster with shared disk on vmware vsan. Shared storage requires disk types that supports both sharing and scsi 3 persistent reservations. Installation of opene dss on vmware workstation for shared. In contrast, only one host can use scsi 2 reservations with one path. Validate scsi 3 persistent reservation failed windows 2008 sp2 cluster across box clustered virtual disk. Mar 23, 2012 i just built out a freenas server explicitly for my hyperv failover cluster after finding that the commonlyused iscsitarget package is not scsi 3 compliant, and freenas does work. Aug 23, 2019 this is possible with the addition of scsi 3 persistent reservations scsi 3 pr support in vsan 6. Windows server 2008 introduced a change to the reservation mechanism used by the clustering solution. I would like to see support for scsi3 persistent reservation to enable shared clustered disks.
If you have a windows cluster, you need to remove scsi3 reservations for the quorum disk, even if all clustered hosts are offline. The luns were first created at the array level and then presented to both servers. Scsi 3 reservations are persistent across scsi bus resets and support multiple paths from a host to a disk. Setup for failover clustering and microsoft cluster. Setup iscsi nappit windows server 2012 r2 cluster 0. Cluster validation fails the scsi3 persistent reservation. Validate that storage supports the scsi 3 persistent reservation commands. Cisco hyperflex hx data platform is a purposebuilt, highperformance, distributed scaleout file system that delivers complete. I have installed many similar environments but with windows 2008 without any issues. I have installed the opene dss on vmware workstation.
Mar 11, 2010 i bought a ts239 pro ii which supposedly supports the scsi 3 persistent reservation needed to make 2008 clustering work, but in my case it doesnt work. When adding rdms, select physical as the compatibility mode and select a new virtual device node. Scsi 3 persistent reservations scsi3 prs native support on vmware vsan. Csv aka cluster shared volumes also requires scsi 3 persistent reservations. Hp p2000 and scsi3 persistent reservation error hewlett. Here is the test which i have performed to confirm whether the lun is supporting scsi3 pr or not using vxfentsthdw command which is part of veritas cluster bundle. Scsi 3 persistent reservations supports multiple nodes accessing a device while at the same time blocking access to other nodes. Has anyone used starwind for scsi3 persistent reservation disks.
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