HPE EVA Storage

Continuous Access log size

 
Modica, Sidney
New Member

Continuous Access log size

Trying to understand the world of CA Logs size.
CA replication will be set at Enhanced Asynchronous, what are the default and maximum DR Log files sizes?
Looking over SPOCK it looks to states the Default DR group log file as 100GB for Sync and Async, what is the max?
And it also reads that in Enhanced Async mode minimum log size is 1624MB, is this correct?
2 REPLIES 2
Víctor Cespón
Honored Contributor

Re: Continuous Access log size

Default =
- Sum of all the vdisks on the DR group for XCS 4.xxx to 6.1xx
- 100 GB for firmwares 6.2xxx and 09xxxxxx

Minimum =
- 136 MB for XCS < 6.1xx
- 1,624 MB for XCS 6.1xx or 6.2xx
- 5 GB for XCS 09xxxxxx
McCready
Valued Contributor

Re: Continuous Access log size

Functionally, the maximum you would want to set it to would be the sum total of all disk drives in the group, keeping in mind the log space will be taken (as it is not already reserved) out of your available space on the disk array at the time of need (when replication would be broken). This space is also RAID1 space as well.

If you do not have a lot of free space avaiable, you need to determine which disk groups will be allowed to grow their logs to what size, before the entire disk group would go into full copy mode upon resumption of replication. This can be a balancing act as some disks (database logs, for instance) may be more important to keep from full-copy mode than others, especially those (database files) that may create a log of log space relative to the actual data changed.

Lastly, you want to make sure that you have at least "single" protection set to provide enough space on the source array to recover upon disk failure if your logs might grow to use up the free space.
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