kernel: sdX: assuming drive cache: write through

Solution Verified - Updated -

Issue

  • When booting a system, the following message is always output.

    kernel: sdX: Cache data unavailable
kernel: sdX: assuming drive cache: write through

-or-

kernel: sdX: Asking for cache data failed
kernel: sdX: assuming drive cache: write through

    sdX means sda, sdb and so on.

  • Does this mean there are problems?

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

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