Re: Why ASMLib doesn't restart automatically on Oracle RAC 19c/12c after restarting Linux 7 server?

Thanks for your explanation for ASMFD, Jon Crisler! Now using UDEV is normal and RAC is able to run after rebooting my Linux 7 server. Yep, ASM Filter Driver (start supporting from 12.1) is very simple to configure ASM disks for Oracle RAC environment - it's the terminator of ASMLib and UDEV (prevent human errors or dd disk). Thank you so much for learning ASMFD from you.

Best Regards
Quanwen Zhao

Jon Crisler <joncrisler_at_gmail.com> 于2022年6月3日周五 21:30写道：

> You earlier said that the ASM Filter Driver was not being used. We
> started using it after internal testing showed that performance using SLOB
> and Orion was not impacted when using ASMFD. In some cases ASMFD is even
> faster.
> I also found that it works well to prevent errors like
> accidentally dropped disks. For example- lets say you are using "oracle"
> as the owner of your disks- any IO operation to those disks must be done
> by the user Oracle, and by one of the programs inside Oracle that typically
> do ASM IO, including kfed, kfod etc. Otherwise the IO is blocked. It
> has been 1-2 years since I tested this out, but I believe that was supposed
> to be one of its main advantages.
>
> In a few cases, a Linux sysadmin accidentally destroyed the OCR disks,
> causing a major headache and outage to repair.
>
> On Thu, Jun 2, 2022 at 9:27 PM Quanwen Zhao <quanwenzhao_at_gmail.com> wrote:
>
>> Thanks, I'll check it out, Rajeev!
>>
>> Afterwards doing some adjustment based on MoS 2214152.1 and continue to
>> observed this issue (reboot server at least twice) sometimes finding ASM
>> disks but sometimes never found them, now I give up ASMLib and get ready to
>> use UDEV, if UDEV won't happen this weird issue then I'll use it, if UDEV
>> is still all the same problem with ASMLib, then the problem should be from
>> my test environment.
>>
>> Thanks everyone!
>>
>> Best Regards
>> Quanwen Zhao
>>
>

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