5.3 Given a scenario, troubleshoot and diagnose problems with storage devices and RAID arrays

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9 Terms

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LED status indicators

  • constant activity = slow performance of storage device

2
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Clicking noise

  • the “click” of death

  • may also include grinding and scraping

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Bootable device not found

  • lights (or no lights)

  • beeps

  • error messages

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Data loss/corruption

  • hard drives are mechanical devices (they will eventually fail)

  • repairs are difficult and expensive

  • an SSD may simply stop working

  • can be impossible to recover

  • ALWAYS have a backup

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RAID failure

  • missing or faulty RAID controller

  • don’t start pulling drives until you check the console

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Self-monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) failure

  • avoid hardware failure

  • schedule disk checks

  • warning signs (replace a drive)

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Extended read/write times

  • a lot happens when reading or writing data (memory access, communication across the bus, spinning drive access)

  • delays can occur anywhere along the way (need a way to measure storage device access)

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Input/output operations per second (IOPS)

  • broad metric of maximum performance

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Missing drives in OS

  • check the BIOS

  • internal drives (bad drive or disconnected cable)

  • external drives (no power to the drive or bad cable connection)