Re: RMAN performance issue after patching OS

Hi Jay,

Do you get the same problem when backing to local disk? Have you compared Unix cp vs rman backup as copy? Have you looked at V$BACKUP_SYNC_IO and V$BACKUP_ASYNC_IO

What command are you using?

Cheers,

Leng.

> On 25 Aug 2021, at 3:17 am, Jay Hostetter <hostetter.jay_at_gmail.com> wrote:
>
> Good afternoon,
>
> Many of our database servers are running Oracle Linux Kernel Release 5 Update 4. We have been patching these servers and discovered our RMAN performance (to NFS shares) has suddenly dropped ( from 100+ mb/s to 10 mb/s). It took us quite some time to figure out that it is actually the OS patch that is causing the issue. We even applied the latest patch (Kernel Release 6 Update 2), but we are still running into the same issues.
> Has anybody else encountered this issue? We have not made any changes to the mount options for our shares. We haven't made any changes to the NFS server itself. We ran a backup to local disk, moved underlying storage for NFS, etc. We finally determined that it is caused by our OS patch.
> Any help would be appreciated.
>
> Thank you,
> Jay Hostetter

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