Firmware updates fix bugs, improve performance, and patch security vulnerabilities. But a failed update can brick components. Follow these best practices. Update Order BMC first (iDRAC/iLO/XCC) — ensures management plane is stable BIOS/UEFI — after BMC is current RAID controller — may require reboot + rebuild NIC firmware — match driver version to firmware Drive […]
RAID
Broadcom MegaRAID vs LSI HBA: Controller Selection Guide
Broadcom (formerly LSI/Avago) makes both MegaRAID controllers (hardware RAID) and SAS HBAs (JBOD pass-through). The same physical card can often be cross-flashed between modes. MegaRAID vs HBA Series Mode Use Case MegaRAID 9460/9560 RAID (IR mode) Hardware RAID 0/1/5/6/10 SAS 9400/9500 HBA (IT mode) JBOD for ZFS/Ceph/TrueNAS Dell PERC and HPE Smart Array use Broadcom […]
Server HBA vs RAID Controller: Which Do You Need?
HBAs and RAID controllers both connect drives, but serve different purposes. Choose wrong and you lose either performance or data protection. When to Use Each Feature HBA (IT Mode) RAID Controller Drive Presentation Individual (JBOD) Virtual disks (arrays) Best For ZFS, Ceph, software RAID Hardware RAID 5/6/10 Cache None 1-8GB with BBU Performance CPU handles […]
RAID Levels Explained: RAID 0, 1, 5, 6, 10, 50, 60 for Servers
RAID (Redundant Array of Independent Disks) protects your data and improves performance. Different RAID levels offer different trade-offs between speed, capacity, and fault tolerance. RAID Level Comparison Level Min Drives Fault Tolerance Usable Capacity Best For RAID 0 2 None 100% Temp/scratch (never production) RAID 1 2 1 drive 50% OS/boot drives RAID 5 3 […]
Dell PowerEdge R740xd Storage Guide: Drive Bays, RAID, Maximum Capacity
The Dell PowerEdge R740xd is a 2U storage-optimized server supporting up to 32x 2.5″ SFF drives or 18x 3.5″ LFF drives plus 2x rear 2.5″ drives. This guide covers storage configuration options. Drive Bay Configurations Config Front Bays Rear Bays Best For 24 SFF 24x 2.5″ 2x 2.5″ SSD-heavy, mixed workloads 12 LFF + 2 […]
Dell PERC RAID Controllers: Complete Guide from H330 to H965
Dell PERC (PowerEdge RAID Controller) is the standard storage controller family for PowerEdge servers. This guide covers every generation from legacy H330 to the latest H965. PERC Controller Generations Controller Server Gen Cache Interface Max Drives PERC H330 13G None 12Gbps SAS 8 PERC H730/H730P 13G-14G 2GB 12Gbps SAS 32 PERC H740P 14G 8GB 12Gbps […]
405-AACW — Dell PERC H330 Mini-Mono RAID Controller (12Gbps SAS, No Cache) | Technical Guide
Overview The Dell 405-AACW is the PERC H330 RAID controller in a Mini-Mono form factor for Dell PowerEdge 13th and 14th generation servers. The H330 is Dell’s entry-level hardware RAID controller — it provides basic RAID functionality (0, 1, 5, 10, 50) without a dedicated write cache. This makes it ideal for non-critical workloads, test/dev […]
P44217-B21 — HPE MR408i-o Gen11 RAID Controller (8GB Cache, 12Gbps SAS, Tri-Mode) | Technical Guide
Overview The HPE P44217-B21 is the MR408i-o RAID controller for HPE ProLiant Gen11 servers — a fundamental shift in HPE’s storage controller architecture. Gen11 moves from the traditional Smart Array family to a Broadcom-based MegaRAID design (the ‘MR’ prefix). The MR408i-o supports Tri-Mode operation: SAS, SATA, and NVMe drives behind a single controller. With 8GB […]
P26325-B21 — HPE Smart Array P408i-a SR Gen10+ RAID Controller (2GB Cache, 12Gbps SAS) | Technical Guide
Overview The HPE P26325-B21 is the Smart Array P408i-a SR controller for HPE ProLiant Gen10 Plus servers. This is HPE’s workhorse RAID controller — an integrated (onboard) 2-port SAS controller with 2GB flash-backed write cache. The ‘i’ designates internal-only connectivity; the ‘a’ indicates it’s an embedded (type-a plug-in) module. It supports hardware RAID 0, 1, […]
405-AAZS — Dell PERC H755 Front RAID Controller (8GB Cache, 12Gbps SAS, Tri-Mode) | Technical Guide
Overview The Dell 405-AAZS is the PERC H755 RAID controller — Dell’s top-tier hardware RAID for PowerEdge 15th generation servers. The H755 introduces Tri-Mode support: a single controller that handles SAS, SATA, and NVMe drives simultaneously. This eliminates the need for separate NVMe switches and allows mixed drive types behind one RAID controller. With 8GB […]