History Logs Continuous Access

[RafaelCastillo]

Is there a problem if the history logs are in different disk group than the replicated data?

Do you have documentation about this subject?

Thanks

[Uwe Zessin · Accepted solution]

I've never heard about a problem - what is your concern?

[Víctor Cespón]

If you're talking about the data files and transaction logs of a database, it's even recommended that they are in different disk groups, so you cannot lose both at the same time.

[RafaelCastillo]

Hi,

vcespon:
No, I'm talking about the history logs generated by a replication process between 2 EVAs. Thanks.

Uwe Zessin:
We just want to be sure there will be no problem when the history logs and the data being replicated are in different disk groups. Actually we have Continuos Access working with data and history logs in different disk groups but our concern is about having problems in the future with logs corruption.

If you have some docs with best practices or explaining how the history logs generated by replication process can be stored it will be very helpful.

Thanks.

[Uwe Zessin]

There are some hints in the CA documentation, but not all hardware / software combinations allow you explicit placement control for the WHL.
Today, it is recommended that you do not place the WHL onto FATA disk drives, especially if you are using the enhanced asynchronous mode (using disk space as a FIFO buffer), because this puts an additional burden on the drives.
Maybe this is what you had in mind?

[RafaelCastillo]

Thanks Uwe Zessin,

Yes, we are using enhanced asynchronous mode but the WHL is placed onto SCSI disk drives.

We will review the CA Documentation again to be sure the actual configuration is right for our needs.

Thanks for your support.

[RafaelCastillo]

The Continuous Access configuration allows to indicate a location to place the WHL, our doubt was if there will be a problem or an issue if this location is different from the location of the data that is being replicated. There are no known issues about this.

Thanks for your support.

[IBaltay]

hi,
maybe this could help:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01489857/c01489857.pdf

[RafaelCastillo]

We will take a look at it.

Thanks for your help.