Re: troubleshooting slow I/O performance.

ASM
6 30TB spinning drives
type of path? we are not using asmlib or asm_fd (whatever its called).

On Mon, May 7, 2018 at 11:54 AM Stefan Knecht <knecht.stefan_at_gmail.com> wrote:

> Some details would help:
>
> - ASM or FS? Type of FS?
> - LUNs? Numbers, sizes?
> - metal? SSD? Type of path to the disks?
>
> Etc...
>
>
> On Mon, 7 May 2018, 21:00 Chris Stephens, <cstephens16_at_gmail.com> wrote:
>
>> We have a new 5 node 12.2 RAC system that is not performing the way we
>> want.
>>
>> The glaring issue is that "db file sequential read"'s are taking ~10ms.
>> before i lob this over to the storage administrators, are there any
>> possible areas in the clusterware/database configuration that I should
>> investigate first? i have root access to all of the nodes. is there any
>> information i can collect that would expedite the process of figuring out
>> why we have such slow I/O times?
>>
>> slow i/o was discovered by running slob. if you don't know about that
>> tool, you should. we all owe kevin a debt of gratitude. ;)
>>
>> if nothing else, i hope to learn a little more about storage than i
>> currently know (which isn't much).
>>
>> thanks for any help.
>>
>> chris
>>
>>

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