010-151 DCTECH case studies
010-151 DCTECH · Put your knowledge to work in context.
The Cisco 010-151 DCTECH exam is the associate-level certification exam associated with Cisco's Data Center Technical Support track, aimed at candidates who install, maintain, and troubleshoot Cisco data center equipment in server, storage, and networking roles. This page is an independent study resource and is not affiliated with, endorsed by, or sponsored by Cisco. The 010-151 DCTECH case studies are 5 cases and about 3,779 words.
1Rack Power Budget and Uplink Cabling for a 12-Node Compute Build
You are racking twelve 1U dual-socket servers into a 42U cabinet. Each server ships with two 750 W hot-plug power supplies, and the vendor sizing tool rates actual draw at 480 W per node under your workload mix.
779 words, about 4 min2RAID Layout and Rebuild Exposure on a 24-Bay Database Array
A two-node database cluster is being refreshed with one 2U, 24-bay chassis per node: 24 x 4 TB 7200 rpm SAS drives, a single RAID controller with 2 GB cache and no battery or flash-backed cache module, and two 12-bay expansion shelves cabled to that same controller. The workload is a 70/30 read/write OLTP database plus a nightly backup that streams to a staging volume on the same spindles.
767 words, about 4 min3Intermittent VM Outages After Adding a Second Uplink
Four ESXi hosts connect to a pair of top-of-rack switches that form a vPC domain, with each host having two 10 Gb adapters, one cabled to each ToR. In the original design only one adapter per host was active.
778 words, about 4 min4Firmware Window Goes Wrong on a Blade Chassis
An eight-node vSphere cluster on blade servers is in a scheduled four-hour change window for a chassis firmware bundle covering CIMC, BIOS, and adapter firmware, applied one node at a time with each node placed into maintenance mode first. The cluster is designed for N+1; with two nodes down at once, memory utilization on the remaining six climbs above 90 percent and the latency-sensitive trading application breaches its SLA.
721 words, about 4 min5Mixed DIMM Population and Correctable ECC Errors on a New Node
A four-node cluster is being staged with two-socket servers that have 12 DIMM slots per socket across six memory channels (two slots per channel), for 24 slots per node. The design calls for identical population on every node, but a supply shortage means node 3 was built with 12 x 32 GB dual-rank RDIMMs on socket 1 and 12 x 16 GB single-rank RDIMMs on socket 2, and four of the socket 2 modules are a different vendor with different timings.
734 words, about 4 min