Scsi persistent reservations provide the capability to control the access of each node to shared storage devices. The host initiators os will control at what interval the reserve request. Use of scsi persistent reservations as a fence method is supported with the following limitations. This software is distributed under the gpl version 2. 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. Scsi persistent reservations red hat enterprise linux 6. Yes dell unity supports scsi3 persistent reservations. Scsi 3 persistent reservation when working with mpio.
This was written for the vnx and earlier arrays, but does apply to the vnxe and unity arrays as well. The one you need to start looking for is linuxiscsi. The output indicated the server was reserved by key abc123, with type 3 exclusive access. This post elaborates the basic usage of scsi reservation in centosrhel systems. Hi all, i am trying to implement io fencing on my vmware test setup using centos 5. Has anyone used starwind for scsi3 persistent reservation disks.
Has anyone used starwind for scsi3 persistent reservation. Solved enable persistent reservations for iscsi volumes. Scsi3 persistent reservations also support multiple paths from host to. Of course, not all scsi storage supports persistent reservation. My understanding of the scsi reservation in a cluster environment is that one node only can reserve a lun for write access.
Scsi3 persistent reserve technology allows for fast eviction and fencing of failed nodes in the cluster. Scsi 3 reservations are mostly used in clustered environment where two or more. Is there a document that clearly explains the difference between scsi 2 reserverelease and scsi 3 persistent reservation. Persistent reservations and registrations are queried by subcommands called. Scsi persistent reservation in iscsi stack overflow. Hello, sorry for the wide distribution, but i was wondering if someone could tell me whether gfs uses scsi3 persistent reservations as an io fencing mechanism. It doesnt yet, but i think its something wed like to do. In the case of linux clusters, cfs like polyserve and sistina gfs are able. What are scsi reservations and scsi persistent reservations. As vmware vsan does not support scsi3 persistent reservation for. It does support scsi3 persistant reservations, im using it right now on opensuse 11.
Its replacing the kernel iscsi target modules as of 2. Using red hat clustering suite or suse linux on a vsphere 6. If the crash is on the initiator side, then youre right, unless the session is persistently recorded on linux, its not, the session gets a new session id. Prs are a scsi protocol feature, so they have been implemented in the linuxio engine, and hence can be used for all scsi transport fabrics, such as fcoe, fibre channel, iscsi, iser, srp, serial attached scsi sas. Question regarding scsi3 persistent reservation dell. Scsi3 persistent reservations supports multiple nodes accessing a device while at the same time blocking access to other nodes. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Enabling scsi3 persistent reserve for db2 purescale feature db2 10. Enabling scsi3 persistent reserve for db2 purescale shared file systems db2 11. Supported for red hat clusteringsuse linux enterprise ha and limited to 8.72 268 137 249 1449 391 1181 1499 81 1498 1320 1148 526 1211 182 1513 1063 727 650 974 705 1200 747 1021 1348 581 748 1279 1347 1021 1388 1054 117 880 1071 277 1264 1432 90 1458 459 469