Volume X has trigger asynchronous write ratio / Write cache

[Former Member]

Hi,

I installed a HANA instance on server where the write cache of the storage controller was disabled because of a faulty battery.

Now I have replaced the battery and surprisingly I see a lot of alerts like this:

Volume 3 (mysaphana:30107, type LOG, path /usr/sap/H02/SYS/global/hdb/log/mnt00001/hdb00003/) has trigger asynchronous write ratio 99%.

What does this mean ?

Should I disable the cache again ?

Regards

Volker

[marcus_bhme · Accepted solution]

Hi Volker,

I found another SCN artical to the same topic () and here the OSS Note 1965379 is mentioned. Here you will find a sql-file in the attachments... Run the top part of it! Works for me. Since yesterday no more alerts are fired.

Good Luck!

Marcus

[Former Member · Accepted solution]

perfect, thanks.

Regards

Volker

[marcus_bhme]

Hi Volker,

did you get a resolution for this? I have this since today after upgrading from Rev 68 to 70.

Regards,

Marcus

[Former Member]

Hi Marcus,

unfortunately I havent a resolution yet, but you raise an interesting point.

I also upgraded to Rev 70, so it might not be the storage controller but the HANA rev.

Maybe its a bug in Rev 70.

Have you experienced a performance loss because of those alerts ? Even if those alerts are annoying, I haven't experienced any negative impact.

Regards

Volker