What are scsi reservations and scsi persistent reservations. Here, your initiator would come up, and execute a persistent reserve out register command to register its nexus. In this case the scsi3 reservation will fail with reservation conflict, as scsi2 reservation is already active in the target. The foreword to the scsi 2 standard draft ans gives a succinct definition of the small computer system interface and briefly explains how scsi 2 is related to scsi 1 and ccs. The name of the drive pool that initiated this operation. Jobs might fail when client or mediaagent is using e or. Please make sure that drive supports scsi2 reserverelease commands and that its not reserved by any third party application. If the library is a standalone drive, the stuck in drive and enable auto cleaning options are not applicable and hence not. Example of a library with two drives of like model type. The only way for the reservation to be released is for a scsi reservation release to be sent to the drive, from the same hba, or by powercycling the drive. Type 3 to select a device for testing, and press enter. Commvault and commvault undertakes no obligation to update, correct or modify any statements made in this forum. Adjust timeout value for scsi commands on mediaagents. To use the format command operation on readwrite optical media, the drive must support setting the format options valid fov bit to 0 for the defect list header of the scsi format unit command.
This command breaks the reservation on a target device. Scsi 3 pr uses a concept of registration and reservation. Alua failover mode 4, emc emc106122 do clariion arrays support the scsi3 earo and wero persistent reservation types. Released by the ansi committee as specification ieee x3. Linux scsi target vstorage apis for array integration. Verify the target device to see whether scsi2 or scsi3 command set. The date and time on which the software was installed on the client.
If you added a node to a twonode cluster that uses one or more shared scsi disks as quorum devices, you must update the scsi persistent group reservations pgr. In contrast, only one host can use scsi2 reservations with one path. If the drive does not support this, the user can write an application for the drive so that it formats media using the dkformat operation. I bought the usb drive, its a wd my passeport 250gb drive. Library properties overview commvault documentation. Vmware introduced the vstorage apis for array integration vaai in vsphere 4. To allow commvault software to control tape device reservations, perform the following steps. However, the reservation call is neither persistent, or capable of surviving reboots, nor able to cope with multiple paths to the same device. Set this string value to the igroup name that was manually created on the file server. Scsi reservation conflict errors with aix, symmetrix and.
How the cluster service reserves a disk and brings a disk online. The name of the drive for which a drive cleaning operation is being performed. Scsi persistent reservation in iscsi stack overflow. How to update scsi reservations after adding a node sun. On unix its possible to specify timeout values for any scsi command as long as the command is delivered using the passthrough driver as arm changers are. The tape hardware must be scsi id addressed and cannot be lun addressed. This message is displayed when we attempt to issue a scsi2 reserve and the command does not complete.
For several commands, the cdb is accompanied by a list of parameters in the dataout buffer. Mediaagent troubleshooting commvault documentation. Scsi reset via sg is needed to break a reservation held by a nonresponding machine. Adding sap hana pseudoclients using the commvault command line interface. A command is communicated by sending a command descriptor block cdb to the device server.
Ibm ultiumtd7 drives are bound to st27 and st28 in the image. With the possibility of drastic failures during crucial operations, we need to understand how we can alleviate the possibility of scsi reservation conflicts. This prevents any other hba from making a reservation on the drive yes reservations come from the hba, so the drive is therefrore reserverd. Based on this issue we limited number of vmdk on datastore. I am wonder if this issue was resolved in vsphere 4. Dr backup settings the software stores all information for the. Arguably the most significant addition of scsi2 is the expanded definition of the common command set ccs providing a common software interface for all disk drives and many peripherals other than disk drives. In scsi 2, data transmission is parallel 8, 16 or 32 bit wide. The scsi 2 reservation ioctl used is part of the scsi 2 command set. This option is useful in the san environment where multiple computers may try to access the same drive, resulting in data corruption. The version of the software that is installed on the client. Typically a multidrive storage unit that houses multiple media.
Cluster validation fails the scsi3 persistent reservation. Restore does not work in rocky openstack release 298. I know on vi 3 there was locking issue at the scsi disk level, which is called scsi disk reservation. The following procedure describes how a server cluster starts and gains control of the shared disks. Scsi 3 persistent group reservations tutorial updated dec 17, 2012 introduction many have heard of scsi 3 persistent group reservations, under various names, such as group reservations, pgr, or even the less descriptive scsi reserve. Product manual disc drive scsi2scsi3 interface vol. Dvdrom drive scsi command set pioneer electronics usa. I updated this post with a new information about devscan tool, which should work on aix 5.
By default, tape driver on solaris uses scsi2 reserverelease. When you upgrade a mediaagent, scsi3 reservation will be enabled if it was enabled in the previous release. If the drive supports third party reserve command, the drive also implements the. A volume label is not required for removable, rewritable or readonly media. This is commonly implemented in most modern disk firmware. Io disk failure fencing scsi3 pr persistent reservation. Writing a scsi device driver linux documentation project. This tool is installed along with the mediaagent software and available on all the mediaagent computers. The should match the array id in the array management tool. The scsi protocol is designed to provide an efficient peer to peer io bus with up to 8 devices, including one or more hosts. An unload scsi command to the tape drive will close the data file. This has triggered the move to serial interfacing in scsi 3. Windows server 2008 introduced a change to the reservation mechanism used by the clustering solution. Hi greg, with emc solutionsenabler you can check if any symmetrix devices are reserved by aix.
The scsi driver is going to retry a failed command and the service is unaffected. There is an ibm issue where the devrsrv f c release l hdisk1 command fails to clear scsi2 reservation see ibms iv76821 for 6. Understand scsi, scsi command responses and sense codes. How to update scsi reservations after adding a node. Cdrom scsi 2 command set reference manual version 3. May 10, 2012 what you are looking at here is a command failure for scsi command 0x16, which is a scsi2 reserve command. This can happen any time the os is rebooted and there has been any change to the drivers or firmware etc. The sd scsi and scsiatapi driver supports embedded scsi2 and ccscompatible scsi disk and cdrom drives, atapi 2. To determine the disk drive type, use the scsiatapi inquiry command and read the volume label stored on block 0 of the drive. The release command must be issued from the holder of the reservation. The control path dialog appears with the command path drive highlighted in yellow and the failover drive selected. Aux copies keep going pending with failed to get the information of the archive file that was created from the archive manager on the commserve. A stepbystep guide to configure netapp cdot ndmp in combination with commvault simpana 10 posted on december 31, 2015 by ruben renders there are some differences in setting up the commvault simpana ndmp idataagent in combination with netapp clustered data ontap cdot compared to a 7mode filer. Instead of using scsi 2 reservations, clustering uses scsi 3 persistent reservations, which removes the need for the dsm to handle translations.
In this document, i will call them pgr, or scsi 3 persistent group reservations. Post add tags to a file or folder in edge drive using id rest api. The driver will either retry the command or, ultimately, give up. Determining root cause for a scsi reservation conflict issue. All the original options of scsicmd still exist which can be seen by either running scsicmd. Commvault activate know your data, and gain insights for better data governance and business outcomes. If the job does not receive a success or failure status within the. Is the rsm removeable storage manager service disabled at the os level. Tape spanning failure on aix mediaagents with native drivers. If you are using a tape drive library versus using a standalone tape drive, the l ibrary must be multitarget, and not multilun. On a unixlinux client computer, navigate to software installation package or mount path, and then run the following command. If scsi 3 was not enabled, the scsi reservation itself which includes both scsi 2 and scsi 3 reservation is disabled.
In this case, you can set the disk ratio value to 4, which will direct rman to include data files from 4 disks in each backup set. The requirements for larger clusters, with multiple nodes reading and writing to storage in a controlled manner, make scsi 2 reservations obsolete. Ensure that the tape drive s virtual target id in the virtual machines configuration is set to be the same as the physical target id. Dsm scsi2 to scsi3 translation mode is used where the application for example microsoft cluster server 2003 is using scsi2 mode, and sfw dsm translates the scsi2 to scsi3 related reservation in order to allow io to use multiple paths on scsi3 capable storage. If the drives are not bound to the st driver in the message log, go tostep 2. We can eliminate these issues by changing our operational behaviors to cover the possibility of failure. Restart of commvault nfs service may force all the nfs clients to remount the share. If varyoff not released the reservation, then you could need one tool depending of the storage vendor. Backup jobs from windows 2003 computers fail in the san environment scsicmd. Are there any prequesites for configuring this or i am missing something.
Not only is this a command failure, but we specifically state that the reservation state of a lun is unknown. There are links to detailed descriptions for the more common scsi commands. It offers high availability, scalability, tiered storage management, and the performance to manage large quantities of data. The io cmd failed because the device is a deactivated snapshot and so the lun is readonly. System messages, event strings and error codes commvault. How the cluster service reserves a disk and brings a disk. When cleared, the drive will not be used for any operation.
If the drive does not support this, the user can write an application for the drive so that it formats media by using the dkformat operation. This will not help in clearing the scsi reservation and might make it more difficult to troubleshoot. When you upgrade a mediaagent, scsi 3 reservation will be enabled if it was enabled in the previous release. Hi, i am about to setup a new 3 node cluster, using storage foundation for windows ha sfw ha version 5. This tool is installed along with the mediaagent software and. The scsicmd utility has been enhanced to now support operations on both scsi 2 and scsi 3 reserved disks. If all you ever do is deploy this one tape drive, never need to replace it, never need to use the interface for something else, never want to get a new server with the same tape drive, never want to restore to a different server and already have the scsi card then scsi is perfectly good except that sas handles interference in the environment. Scsi3 reservation is used when you enable the use scsi reserve for contention resolution option in the library properties dialog box.
If scsi3 was not enabled, the scsi reservation itself which includes both scsi2 and scsi3 reservation is disabled. This gets increasingly difficult with higher data rates and longer cables because of varying signal delays on different wires. If the drives are bound to the st driver in the message log, go to step 6. A unique id generated by the software for the media, when the media was discovered.
When selected, the drive will be used for restores operations even if the drive is marked as requires cleaning, either by sense code or exceeded thresholds. The scsicmd tool is used to test whether the hardware supports scsi3 reservation. This cluster is going to be a 3 node netbackup masterserver nbu 7. Alternatively the tids argument may specify a file or pipe from which one or more transportids may be read.
As an immediate workaround, release the reservation on the lun, or reset the lun. Hp storageworks ultrium tape drives failing backups when connected to lsi scsi hba and using storport driver versions later than 5. Adjust timeout value for scsi commands on mediaagents ma0006. Verify that the target device supports either scsi2 or scsi3 command set for persistent reservation. For example, consider data files distributed across 10 disks that supply data at 10 bytessecond and a tape drive that needs 40 bytessecond to keep streaming. Add items to legal hold may produce failed items if concurrent jobs are running with many items that are common to these multiple jobs. A stepbystep guide to configure netapp cdot ndmp in. The content of the forums, threads and posts reflects the thoughts and opinions of each author, and does not represent the thoughts, opinions, plans or strategies of commvault systems, inc. Dvdrom drive scsi command set page 1 of 6 pioneer new media technologies, inc.
This command can either be a bus reset for the entire bus or, using the storport drivers a targeted reset for a particular device on the bus. Scsi3 persistence reservation indicates no for a storage. Vaai significantly enhances the integration of storage and servers by enabling seamless offload of locking and block operations onto the storage array. Hi, we are seeing a lot of scsi reserve errors on a tape drive shared bw media servers and a ndmp hnas filer. To do this, you remove the quorum devices which have scsi 2 reservations. Forums scsi2 reservation command to the drive failed. How to use the scsicmd utility to perform various scsi2 and. Reservations allow multiple machines to share the same device via a reserverelease mechanism. Scsi3 reservation is used when you enable the use scsi reserve for contention. Verify that both fc ports are correctly cabled to the san. Furthermore, wiring cost and drive power increases with wider data words and higher speed. Scsi 2 reservation is enabled by default for all tape drives attached to a newly installed mediaagent in this release. Commvault software is designed to protect gpfs data, keeping in mind the complex and varied enterprise environment requirements with sufficient resiliency.
However in aix, this keeps disks reservation when you varyon the volumegroup and will remove it when you varyoff volume groups exist two reservation methods scsi 2 and scsi 3. One single, powerful solution for data protection wherever your data lives. Unhandled sense key the request sense data included an invalid. Scsi2 reservation issues vmware esx servers effects on.
Unable to associate a plan to a new virtual client from the command center. Most tape drives are known to support either of these command sets. Add tags to a file or folder in edge drive share using id rest api. Seagate scsi interface product manual pdf download. Interconnecting hardware, such as storage routers or bridge, which connects standard scsi devices into fc fabric, should also support this command. The volume label describes the disk geometry and partitioning and must be present for the disk to be mounted by the system.
Ive failed to find some comment about it in lio kernel code. Checking scsi reservation on your disks my aix cheatsheet. Repair volume command for dynamic mirrored volumes. Some opcodes produce different, though usually comparable, effects in different device types. Scsi error data recovery general discussion tektips. Download software job fails to download unix appliance payload. For example, the output of the cfgadm al command may be as follows. Mar 05, 20 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. Resolving scsi reservation conflicts from the netapp storage system. The requirements for larger clusters, with multiple nodes reading and writing to storage in a controlled manner, make scsi2 reservations obsolete.
The request sense command did not transfer any data. Tape spanning failure on aix mediaagents with native drivers ma0004. Turning off the scsi reservation on the library is not an option unfortunatly. Standard registry keys and parameters are created during the. The scsi standards define commands, protocols, electrical, optical and logical interfaces.
Verify the target device to see whether scsi2 or scsi3 command set for persistent reservation is supported. Scsi2 reservation is enabled by default for all tape drives attached to a newly installed mediaagent in this release. Changing the display language of the commvault software. The drive goes down and backups are failing to these drive. Solved is there such a thing as a usb to scsi cable, device. If the need arises to block access to a device because of data integrity concerns, only one host and one path remain active. When selected, indicates that the mediaagent must use the drive exclusively during data protection and other operations, using scsi reservation. To use the aix format command operation on readwrite optical media, the drive must support setting the format options valid fov bit to 0 for the defect list header of the scsi format unit command.
Remove storage manager and hp tape support is turned off. Please refer to the sff8090 specifications for details of the dvdrom command set and to the sff8020 specifications for the cdrom command set. Commvault hyperscale scaleout data protection designed to grow with you delivered as software, or as an appliance. The user configurable identifier provided for the media. When the native drivers are utilized, they conflict with the scsi3 reserverelease done by the mediaagent and the data protection operations wait indefinitely.
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