Re: exadata flash cache and flash disk metrics

From: Andy Wattenhofer <watt0012_at_umn.edu>
Date: Thu, 24 Jan 2019 11:23:00 -0600
Message-ID: <CAFU3ey6L6wRQ84kckQkj22ZEL2XDrnx1AVjc9_VsC2kZuSQkjw_at_mail.gmail.com>



It's possible to create flash disks on the flash cards (FDOMs) in the cells (see doc id 2066305.1
<
https://support.oracle.com/epmos/faces/DocContentDisplay?id=2066305.1>). Maybe you have those. Output of "cellcli -e list griddisk" on any cell would show you.

Andy

On Thu, Jan 24, 2019 at 10:26 AM Ls Cheng <exriscer_at_gmail.com> wrote:

> Hi all
>
> Does anyone know the differece between these two metrics in Exadata Cells?
>
>
> 1. DB_FC_IO_RQ_SM_SEC => The number of small I/O requests issued by a
> database to flash cache per second.
> 2. DB_FD_IO_RQ_SM_SEC => The number of small I/O requests issued by a
> database to flash disks per second.
>
>
> The difference between flash disk and flash cache precisely.
>
> Our is 1/8 X6 Rack with HC disks with Flash Cache however when I run LIST
> METRICCURRENT DB_FD_IO_RQ_SM_SEC I actually see some values which is quite
> confusing because we are using flash cache and not flash disk (instead we
> have HC disks).
>
> Any lights?
>
> Thanks
>
>
>
>
>
>
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Received on Thu Jan 24 2019 - 18:23:00 CET

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