Linux SAN & Multipath Consulting

Zwiegnet delivers professional Linux SAN storage consulting for mission-critical environments requiring rock-solid connectivity to Fibre Channel, iSCSI, or NVMe-oF storage arrays (EMC, NetApp, Pure, Dell, HPE, IBM, Hitachi, etc.). We specialize in multipath configuration, performance tuning, high-availability failover, and rapid troubleshooting on RHEL, AlmaLinux, Rocky Linux, Oracle Linux, Ubuntu LTS, and Debian.

Our Linux SAN & multipath expertise includes:

• Multipath Configuration & Optimization (device-mapper-multipath / multipathd) – Full setup of multipath.conf with optimal path_grouping_policy (multibus/group_by_prio), path_selector, polling_interval, no_path_retry, checker_timeout, hardware handlers (1 Emulex, 1 NETAPP, 1 DELL, etc.), blacklisting, and ALUA support.
• Fibre Channel (FC) SAN Integration – HBA driver tuning (qla2xxx, lpfc, bnxt_en), zoning (WWN/port-based), LUN masking, persistent binding, SCSI persistent reservations, and fabric event monitoring.
• iSCSI Enterprise-Grade Setup – iscsiadm configuration, CHAP/mutual CHAP, MPIO multipathing, iSCSI offload (bnx2i, cxgb4i, qla4xxx), jumbo frames, and session/connection failover tuning.
• NVMe over Fabrics (NVMe-oF) – NVMe/TCP, NVMe/RDMA (RoCEv2, iWARP), NVMe/FC configuration, subsystem discovery, namespaces, ANA (Asymmetric Namespace Access) multipathing, and performance benchmarking.
• High Availability & Failover Testing – Active/active, active/passive, round-robin load balancing, path failure simulation, automatic failover validation, and recovery time measurement.
• Performance Tuning & Troubleshooting – Queue depth tuning, I/O scheduler (none/mq-deadline/kyber), block layer parameters, fio benchmarks, iostat/sar analysis, latency debugging, and multipath path balancing issues.
• Security Hardening – Secure boot, firewall rules for iSCSI/NVMe, CHAP secrets management, IPsec for iSCSI, and fabric-level security best practices.
• Migration & Modernization – Seamless migration from legacy HBAs to modern adapters, old multipath.conf to new syntax, CentOS 7 → AlmaLinux 9 transitions, and legacy array to modern storage migration.
• Monitoring & Automation – Integration with Nagios/Zabbix, custom multipath status checks, Ansible playbooks for consistent multipath deployment across fleets, and alerting on degraded paths.

Perfect for enterprises running large-scale databases (Oracle, PostgreSQL, MySQL), virtualization clusters (VMware ESXi on Linux hosts, KVM, OpenStack), ERP systems, HPC workloads, and any application requiring low-latency, high-IOPS, and zero-single-point-of-failure storage connectivity.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to battle-tested Linux storage specialists with decades of production SAN experience.