exadata flash cache and flash disk metrics
From: Ls Cheng <exriscer_at_gmail.com>
Date: Thu, 24 Jan 2019 17:25:51 +0100
Message-ID: <CAJ2-Qb_nR2upSHXAKVXxhsvL4X3m=PY9dFFRkin2ZUMfMaRW6A_at_mail.gmail.com>
Hi all
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Date: Thu, 24 Jan 2019 17:25:51 +0100
Message-ID: <CAJ2-Qb_nR2upSHXAKVXxhsvL4X3m=PY9dFFRkin2ZUMfMaRW6A_at_mail.gmail.com>
Hi all
Does anyone know the differece between these two metrics in Exadata Cells?
- DB_FC_IO_RQ_SM_SEC => The number of small I/O requests issued by a database to flash cache per second.
- 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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