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Hourly - Intermediate ($$) - Est. Time: Less than 1 week, 10-30 hrs/week - Posted
We are developing a two node cluster solution with shared storage via SAN (ISCSI or Fiber Channel). We are not using any cluster solution (MS failover cluster), instead we try to emulate what these solutions do. Our main challenge is to keep the SAN disk from getting corrupted. As the file system the disk is initialized with is not cluster aware, our goal is to keep only one machine out of the two mounting the disk at all time. The other machine will have the disk set to offline (using diskpart equivalent commands). We are synchronizing these restrictions using inter node communication and SCSI reservation mechanism. Currently our issue is that whenever the machine mounting the disk (i.e. the active node) restarts for some reason (some failure or even planned restart) the following happens: 1. The non-active node identifies the active machine has gone offline and takes over (brings the SAN disk online). 2. The formerly active node restarts and the SAN disk immediately becomes online since it’s the last state it was in before the restart occurred. So now we have the two nodes with the shared storage online which is not wanted. Another issue we have is that when the machine restarts it may assign the drive letters to the volumes differently each time which is causing our application to lose the disk. Our questions are: 1. Can we set some parameter, configuration, registry to have the operating system start with a specific disk is offline? (we tried using diskpart to set ‘SAN policy’ to offline/ shared-offline all with no success) 2. What are the risks of having the disk online on both nodes if just one node performs writes (are there hidden writes being done by the OS without our control that can cause a corruption). 3. Are there more pitfalls that we haven’t even considered that can cause our solution to be inadequate for cluster purposes? 4. Is there a way to permanently assign a drive letter to a disk which will persist restarts? Thanks shai
Skills: IBM System Storage Cluster Computing Microsoft Server
Fixed Price Budget - Intermediate ($$) - $100 to $500 - Posted
We would like content written on Cloud, IaaS, PaaS, DR, BC, CDP, Data Protection for Enterprise solutions in leading technologies. We invite personals with Certifications in Cloud Technologies like AWS, Openstack, Puppet to provide market relevant content. This is an ongoing project that will be couple hours a week or biweekly.
Skills: IBM System Storage Cloud Foundry EMC Symmetrix HP Cloud