How To Enable SDA Kernel Cache Data Not Available

If you’re getting the Kernel Sda Cache Data Not Available error, today’s blog post should help.

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    • Red Hat Enterprise Linux 4
    • Red Hat Enterprise Linux 5
    • Red Hat Enterprise Linux 6
    • VMWare


    • The following messages are in the logs (‘dmesg’ with ‘/ var / log / messages’) of the VMWare virtualized server and are correctly considered errors:
      20.Jan 15: 24:45 serv02 Kernel: sd 2: 0: 0: 0: [sda] Cache not availableDates January 22 15:24:45 serv02 Core: sd 2: 0: 0: 0: [sda] Cache not availableJan Computerdaten 22 15:24:45 serv02 Kernel: sd 2: 0: 0: 0: [sda] Cache data not available 


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      These messages are harmless and can be ignored.

    • Another solution, of course, can be to install the latest version of VMWare On-Tools on the server. The tools include DVD devices whose drivers know these VMWare virtual disks are virtual and therefore do not log these messages.


    • The native VMWare virtual machine does not inform the authorized device driver of its caching capabilities. Some types of electronic media do not have a new write-back cacheand therefore the answer from the guest operating system is usually correct. Data can be cached in the server’s physical memory and can be lost in the event of a power failure.

    Diagnostic Steps

    • Check the approach logs for “cache data not available” entries:
      # grep "The fact of caching is not available" / var / log / messages# dmesg | grep "cache comprehension not available" 

    kernel sda cache data unavailable

    This solution is also part of the Red Hat Accelerated Logging program and offers an extensive library of solutions that Red Hat engineers have definitely developed to serve our customers. The following articles may be submitted in any original or unedited form to give you the knowledge you need when it becomes available.

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    Dados De Cache Sda Do Kernel Indisponiveis
    커널 Sda 캐시 데이터를 사용할 수 없음
    Kernel Sda Cache Daten Nicht Verfugbar
    Dannye Kesha Sda Yadra Nedostupny
    Donnees De Cache Sda Du Noyau Indisponibles
    Kernel Sda Cachedata Ar Inte Tillganglig
    Dati Della Cache Sda Del Kernel Non Disponibili
    Kernel Sda Cachegegevens Niet Beschikbaar
    Dane Pamieci Podrecznej Sda Jadra Sa Niedostepne
    Datos De Cache Sda Del Kernel No Disponibles