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Symptoms Issue Description In a two-layer ScaleIO setup, one or more ScaleIO volumes return IO errors, in case all SDS-SDC interfaces are unavailable on a single SDS. Scenario A two layer ScaleIO system. The SDS are configured with IP roles. That is, network traffic between SDSs and SDCs is configured to use dedicated interfaces on the SDS. SDS-SDC interfaces are occasionally referred to as front-end, data path or sdc_only interfaces. SDS-SDS interfaces are occasionally referred to as back-end, rebuild or sds_only interfaces. On a single SDS, all SDS-SDC interfaces are unavailable. Note that, in a fully redundant system, this scenario should not occur due to a single-point failure. Symptoms One or more ScaleIO volumes return IO errors on access. No rebuild is initiated. Impact Some or all data is unavailable to clients. Cause The SDCs cannot access the data on the affected SDS, as all its interfaces are down. However, no rebuild is initiated, that is, the data will not be made available via other SDSs. No rebuild will be initiated as the MDM and all other SDSs can access to the affected SDS via the SDS-SDS interface(s). Note that SDS-MDM communications use the SDS-SDS network interfaces. Resolution Workaround Bring back at least one of the SDS-SDC interfaces only or add another, SDC-accessible, IP address to the SDS-SDC role. This will make the SDS available to serve requests without a rebuild. In case it is not possible to perform the above within the desired time frame, in ScaleIO version 2.0 and above, place the affected SDS in maintenance mode or, in earlier versions, shut down the SDS process. This will initiate a rebuild, and the data will be made available via other SDSs. For the correct procedure for performing these actions, refer to the relevant ScaleIO version s documentation. In case there is only one SDS-SDC interface on one or more SDSs, add another interface in order to provide redundancy, thereby eliminating the possibility that a single-point failure will cause the described issue. Please note: When using IP roles, the recommnadation is to use at least 4 IP's (2 SDS-SDS

Vendor claims hundreds of Dell EMC PowerFlex customers in education, finance and healthcare. It marks the second name change for ScaleIO platform that EMC bought in 2013. Dell EMC PowerFlex is the new name for VxFlex software-defined storage, culminating the vendor's portfolio-wide branding under the Power nomenclature. The rebranding involves Dell EMC storage and networking products that use Dell PowerEdge compute servers. It marks the second rebranding of the ScaleIO server-side software that EMC acquired for $200 million in 2013. Dell and EMC merged two years later and changed ScaleIO to VxFlex. Dell EMC PowerFlex does not have as high a profile as Dell-owned VMware vSAN software-defined storage. But "hundreds and hundreds" of customers in education, finance and healthcare use it as scalable block storage, said Matt Paul, a Dell EMC senior director of product management. "We're talking with customers that have huge requirements to scale performance," Paul said. Configuring PowerFlex PowerFlex Manager manages PowerFlex rack and appliance models, and PowerFlex software is also available in VMware Ready Node configurations. Dell EMC PowerFlex could be used to create a two-layer SAN to disaggregate compute and storage. The vendor also positions PowerFlex as a way to run to multiple hypervisors, bare metal workloads and containerized applications on one platform. Dell EMC VxRail and VxRack HCI is geared for larger hyper-converged infrastructure deployments within VMware shops, but supports only VMware vSphere hypervisors. Dell EMC PowerFlex Rack is a rack-scale product that provides compute, storage and integrated networking. The minimum Dell EMC PowerFlex purchase requirement is four nodes, and Dell EMC claims the system can scale linearly to thousands of nodes. Along with the new name, Dell EMC added PowerFlex enterprise data services, which includes native encryption, inline compression, scalable replication, secure snapshots and thin provisioning. Dell EMC PowerFlex Rack provides compute, storage and integrated networking. Customer consolidates on Dell EMC PowerFlex David Lee said he was looking to consolidate storage that would enable him to take full advantage of VMware VMotion. After several years of storage built on various SANs, Lee integrated Dell EMC PowerFlex block storage to support students and faculty