Scsi3 pr error on win2012 hyperv cluster and vnx 5500 dell. Most components comprising iscsi san4v are not open source. Simpana to scsi3 reservation all tape problems were solved. Enabling scsi3 persistent reserve for db2 purescale. So i am running into a huge problem of openfiler not supporting scsi3 persistent reservation, which is needed for clustering on windows server 2008. While most legacy applications can function using the reserverelease commands, some newer applications, notably windows 2008 cluster, require spcscsi primary command3 persistent reservation pr commands to function properly. We appreciate your interest in having red hat content localized to your language. Operations that require getting a file lock or a metadata lock in vmfs result in shortlived scsi reservations. When a lun is reserved, no other computers on the san can access the disk, except the ones cluster controls. Open source communities how can i view, create, and remove scsi persistent reservations and keys. Windows 2012 cluster on p6300 scsi3 persistent reservation. Hi scstexperts, where does the scst store persistent reservation info. Persistent reservations support as an iscsi target lun can be accessed from multiple initiators concurrently, such as in a highavailability cluster or sharedstorage flesystem, a means by which to prevent initiator io clashes has to be implemented.
Open the disk management under storage of computer management. Hi all, i am trying to implement io fencing on my vmware test setup using centos 5. In this reservation information, the reservation is a scsi3 persistent group reservation. How to use the scsicmd utility to perform various scsi2. Freenas has had support scsi3 persistent reservations for a long time, its been a while coming to openfiler, because 2. Some storage devices have a defined limit in the amount of scsi3 registrations or reservations that it can handle. And the number for each the xp fiber channel port must be less than or equal to 128. Jun 07, 2012 this entry was posted on june 7, 2012 at 5. Has anyone used starwind for scsi3 persistent reservation. Scsi persistent reservation in iscsi stack overflow.
How to configure an iscsi target that supports the scsi3. Please refer to vmware doc about setting up microsoft failover cluster in vmware environment. How to use the scsicmd utility to perform various scsi2 and. Openfler iscsi san4v will honor initiator pr commands where necessary. There is a two stage process to obtain a persistent reservation.
Netapps is aware of this issue and the bug will be fixed with new code. How scsi3 persistent reservations are used by the storage connector. Hp p2000 and scsi3 persistent reservation error hewlett. Persistent reserve support affects both the parallel scdisk and scsi3 scsidisk disk device drivers and configuration methods. As such this is not a completed standard and has not been approved. Determining root cause for a scsi reservation conflict. Ip address restrictions, chap, mpio, iscsi failover, scsi3 persistent reservation, session management. Tiebreaker resources are stored is not also used to store file systems. As you can see, the report clearly specify that disk does not support persistent reservation. How to verify that the disk is iscsi3 persistent compliant red hat. A pr is a scsi command, which clustering uses to protect luns.
Openfiler iscsi san4v supports persistent reservations and passes windows failover cluster validation. Solved openfiler after installation spiceworks community. Excessive scsi reservations cause slow host performance. This cmdlet cannot be run remotely without credential security service provider credssp authentication on the server computer. At this point, this is where the persistent reserve out preempt or preempt and abort commands come in. The initiator registers a reservation key with the target. These pr commands and command options give scsi initiators the ability to establish, preempt, query, and reset a reservation policy with a specified target disk. Persistent reservations and registrations are queried by subcommands called service actions in spc4 of the scsi persistent reserve in prin command. 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.
You can remove scsi3 reservations for the quorum disk on the netapp controller using the storage disk removereservation command. Persistent reserve refers to a set of small computer systems interface 3 scsi3 standard commands and command options. Validate that storage supports the scsi 3 persistent reservation commands. Mar 14, 2010 the picture below shows you an extract of the validation tool report. This is important to protect other machines from accessing the disk and corrupting the data on the disk. Hi all, we are trying to build a failover cluster within our vsphere 6. This cluster is going to be a 3 node netbackup masterserver nbu 7. How to configure scsi 3 persistent reservation on tgtd. Cluster validation fails the scsi3 persistent reservation in windows server 2016. Without this flag, its not possible to place a scsi persistent reservation on the device. Hpe storage users group view topic scsi 3 persistent. Scsi3 reservations are persistent across scsi bus resets and support multiple paths from a host to a disk.
After some research, i found out that a cluster using iscsi disks, iscsi target must support persistent reservation. Forcing the clearing of persistent reservations on a disk formerly used by the cluster. All the original options of scsicmd still exist which can be seen by either running scsicmd. This cmdlet cannot be run remotely without credential security service provider credssp authentication on. Scsi 3 persistent group reservations tutorial updated dec 17, 2012 1.
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. Scsi3 persistent reservations also support multiple paths from host to disk whereas scsi2. What are scsi reservations and scsi persistent reservations. Clusters that use persistent reservations as a way of coordinating access to shared storage all have to deal with the case where you need to take over a reservation held by another initiator. Cluster validation fails the scsi 3 persistent reservation test in windows server 2008 and windows server 2008 r2. Excessive scsi reservations by a host can cause performance degradation on other servers accessing the same vmfs. Most people who download openfiler dont understand any of this if they did, they wouldnt be using. Persistent reservation defined by the ansi scsi3 primary commands spc3 standard. Iet iscsi supports reserve release but not persistent reservations.
Issues still exist, but have reduced significantly with scsi 3 drive reservations configured. Microsoft cluster datastores and iscsi openfiler vmware. The scsicmd utility has been enhanced to now support operations on both scsi2 and scsi3 reserved disks. Instead of using scsi 2 reservations, clustering uses scsi 3 persistent reservations, which removes the need for the dsm to handle translations. Cluster validation fails the scsi 3 persistent reservation.
Scsi3 persistent reserve technology allows for fast eviction and fencing of failed nodes in the cluster. Please read on scsi 3 persistent reservation as a requirement for windows clustering which as of the moment openfiler does not officially support. What we have found is that a lot of people try it and without understanding san in general and the scsi reservation issue in particular implement something that works well in a lab and put it into production and are then stuck with their investment and realize that they data has been corrupted or is at risk. Other initiators must coordinate with the reservation holder to access the target. Enabling scsi 3 persistent reserve for db2 purescale shared file systems db2 11. Validate scsi 3 persistent reservation description. Pgr persistent group reservation lun, lun registration reservation key, reserve, lun. This is what an spc4 draft says about the commands. I have a vmware virtual environnement with hpe 3par 8200 fc. Commvault media agents appear to spit out loads of turs even though tur is supposed to be disabled on ma install via reg keys.
Solved enable persistent reservations for iscsi volumes. In contrast, only one host can use scsi2 reservations with one path. Or the hp dsm for windows 2012 is not quite stable yet. Persistent reservations and registrations are changed by subcommands of the scsi persistent reserve out prout command. I am seeing inconsistent results using persistent reservations with srp, it seems to take a number of attempts to register, reserve, release and unregister from the lun and writing to the lun from the initiator that is the reservation holder does not always work. Scsipr tiebreaker on linux for system x ibm knowledge center. Openfiler persistent reservations solutions experts exchange. Dec 05, 2012 we dont recommend openfiler because you risk finding that the default included iscsi stack lacks support for scsi 3 reservations and can cause your data to become corrupted especially in an environment like virtualization and to fix this you need to buy a one thousand euro iscsi replacement module. Also had a lot of issues with reservations scsi conflicts to both physical and virtual tape libraries.
So i am running into a huge problem of openfiler not supporting scsi 3 persistent reservation, which is needed for clustering on windows server 2008. No spc 3 reservation holder no spc 3 reservation holder 0x0000002d no spc 3 reservation holder spc 3 pr registrations. Cluster validation fails the scsi3 persistent reservation test in windows server 2008 and windows server 2008 r2. Reservations managed by the reserve and release scsi commands. The basic iscsi target implementation in openfler supports scsi reserverelease. Linux does support this, but it appears openfiler does not though freenas does, but that would be a massive migration. Feb 07, 2011 home windows cluster forcing the clearing of persistent reservations on a disk formerly used by the cluster forcing the clearing of persistent reservations on a disk formerly used by the cluster february 7, 2011 msufian leave a comment go to comments. Validating test disk 1 for persistent reservation support. The scsipr tiebreaker uses scsi3 persistent reservations on a scsi disk storage. How to activated scsi 3 persistent reservation on 3par 8200 for microsoft slustering on vmware most likely you are not using virtual compatibility mode for the assigned vmdk drives. Scst devel persitent reservations scst devel persitent reservations. Scsi 3 persistent group reservations tutorial updated dec 17, 2012 3.
The scsicmd utility has been enhanced to now support operations on both scsi 2 and scsi 3 reserved disks. Has anyone used starwind for scsi3 persistent reservation disks. I want to know how to activated scsi3 persistent reservation on 3par 8200 lun. Solved openfiler after installation spiceworks page 2. The reservation holding initiator releases the target reservation, using its key. Can i use iscsi san4v with windows failover cluster. 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. Dec 05, 2012 i searched open filer source code for download but it is not available. This has been addressed in this community at length. Enabling scsi3 persistent reserve for db2 purescale shared. I have two initiators connecting to one target and would like to make use of. I have installed many similar environments but with windows 2008 without any issues. I would like to purchase openfiler ce with iscsi san4v but do not have a paypal account.
Cluster validation fails the scsi3 persistent reservation. Please note that excessive use of this feature could cause delays in getting specific cont. If you have 3 nodes with 2 hbas each for multipath and 10 luns. I think that in windows 2012, theres something different regarding scsi3 persistent reservations. Freenas has had support scsi 3 persistent reservations for a long time, its been a while coming to openfiler, because 2. Well, as stated above, we observed a host state that the reservation state of a lun was unknown because of the following sequence. When looking at the scsi standards however, there are two types of scsi reservations, not three. Hi, i am about to setup a new 3 node cluster, using storage foundation for windows ha sfw ha version 5. You might like to use other alternatives like freenas which supports scsi 3 persistent reservation. To do that, i suggest you open a sr and let the emc support do this for you. Openfiler iscsi san4v is licensed, per installed instance, under an annual subscription license.
Devices are unmounted if possible, but open file handles or timeouts may prevent. The clearclusterdiskreservation cmdlet clears the persistent reservation on a disk in a failover cluster. Neither openfiler, nor freenas seems to support this feature yet. Scsi 3 persistent reserve technology allows for fast eviction and fencing of failed nodes in the cluster.
Where does the scst store persistent reservation info. The luns were first created at the array level and then presented to both servers. If your initiator and target can handle it, the persistent reserverelease commands in spc 3 offer much more flexibility. Issues still exist, but have reduced significantly with scsi3 drive reservations configured. Sl3000 scsi operation and configuration oracle docs. If deploying openfiler in a production environment with vmware esxi, openfiler iscsi san4v is required. The following figure represents the file system structure of a sap hana setup. Scsi3 persistent group reservations tutorial updated dec 17, 2012 1.
Why did a scsi2 reserve get left on a lun requiring a manual lun reset be issued to the device to clear it. As you probably know, its possible to create a windows 2008 cluster using iscsi target. On vnxclariion, you can also check a file in the spcollect called. Instead of using scsi2 reservations, clustering uses scsi3 persistent reservations, which removes the need for the dsm to handle translations. In contrast, only one host can use scsi 2 reservations with one path. Forcing the clearing of persistent reservations on a disk. Enabling scsi3 persistent reserve for db2 purescale shared file systems db2 11. Issuing persistent reservation register and ignore existing for test disk 1 from node hyperv04. I think that in windows 2012, theres something different regarding scsi 3 persistent reservations. How can i view, create, and remove scsi persistent. Windows server 2008 introduced a change to the reservation mechanism used by the clustering solution. You can use freenas to build up a iscsi cluster with windows 2008. Persistent reservations support as an iscsi target lun can be accessed from. This cmdlet prompts for confirmation unless you specify the force parameter.
You can remove scsi 3 reservations for the quorum disk on the netapp controller using the storage disk remove reservation. 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. The xp disk array has a limitation of 128 simultaneous scsi3 reservations per port. Forums scsi2 reservation command to the drive failed. You can follow any responses to this entry through the rss 2. Some storage devices have a defined limit in the amount of scsi 3 registrations or reservations that it can handle. Sap hana fiber channel storage connector admin guide. If your initiator and target can handle it, the persistent reserverelease commands in spc3 offer much more flexibility. You can register each nexus with the lu and then set an exclusiveaccess registrantsonly reservation that blocks access to everyone else, but permits it to the registered nexuses. If the need arises to block access to a device because of data integrity concerns, only one host and one path remain active. Scsi 3 reservations are persistent across scsi bus resets and support multiple paths from a host to a disk.