hardware 归档 - 夜莺博客

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ZFS ARC Size Tuning on Linux

ZFS ARC Size Tuning on Linux

Tune the ZFS ARC with zfs_arc_max and zfs_arc_min: how the default is calculated, when to change it, how to verify with arcstats, and what not to touc

admin admin 2026-10-13
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Dell OS10 Hardware Health and Optics Diagnostics

Dell OS10 Hardware Health and Optics Diagnostics

Use Dell SmartFabric OS10 show commands to check PSU, fan, temperature and optic health: show environment, show interface transceiver and support bund

admin admin 2026-10-06
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PTP Boundary Clock vs Transparent Clock Explained

PTP Boundary Clock vs Transparent Clock Explained

IEEE 1588 PTP explained: ordinary, boundary and transparent clocks, why boundary clocks stop jitter accumulation, and what to configure on switches.

admin admin 2026-10-03
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Cisco ASR 9000 show environment: Power, Fans and Temperature

Cisco ASR 9000 show environment: Power, Fans and Temperature

Use show environment on the Cisco ASR 9000 to check power supplies, fans and temperatures, plus show platform and show memory summary for node health.

admin admin 2026-10-03
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Switch ASICs: Trident, Tomahawk and Silicon One

Switch ASICs: Trident, Tomahawk and Silicon One

What decides switch behaviour when the ports look identical: Broadcom Trident and Tomahawk versus Cisco Silicon One, buffer depth, programmability and

admin admin 2026-10-02
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Console Servers and Out-of-Band Management Design

Console Servers and Out-of-Band Management Design

Design an out-of-band management network: console server sizing, dual power, separate paths, static addressing and the access controls that matter.

admin admin 2026-10-02
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Multigigabit 2.5G and 5G Ethernet on Existing Cat5e

Multigigabit 2.5G and 5G Ethernet on Existing Cat5e

Multigigabit Ethernet explained: how 2.5G and 5G run over existing Cat5e, cable limits per speed, PoE implications and when to deploy it.

admin admin 2026-10-02
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QSFP-DD vs OSFP: Choosing 400G and 800G Form Factors

QSFP-DD vs OSFP: Choosing 400G and 800G Form Factors

QSFP-DD versus OSFP compared: size, thermal headroom, backward compatibility, which switches accept which, and how to choose for 400G and 800G.

admin admin 2026-10-02
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Copper Cable Certification: Permanent Link vs Channel

Copper Cable Certification: Permanent Link vs Channel

Copper certification explained: permanent link versus channel adapters, what insertion loss, NEXT and return loss mean, and how to fix failed runs.

admin admin 2026-10-02
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Structured Cabling: TIA-568 and TIA-606 Rules

Structured Cabling: TIA-568 and TIA-606 Rules

TIA-568 structured cabling rules for network engineers: 90 m permanent link, 100 m channel, bend radius, untwist limits, and TIA-606 labelling.

admin admin 2026-10-02
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