[DRBD-user] What is term "active set" means and what size to choose?

Lars Ellenberg Lars.Ellenberg at linbit.com
Tue Jun 21 17:36:50 CEST 2005

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


/ 2005-06-21 19:26:02 +0400
\ Igor Yu. Zhbanov:
> Hello!
> 
> In sample drbd.conf there is an option al-extents:
> 
>     # Configures the size of the active set. Each extent is 4M,
>     # 257 Extents ~> 1GB active set size. In case your syncer
>     # runs @ 10MB/sec, all resync after a primary's crash will last
>     # 1GB / ( 10MB/sec ) ~ 102 seconds ~ One Minute and 42 Seconds.
>     # BTW, the hash algorithm works best if the number of al-extents
>     # is prime. (To test the worst case performace use a power of 2)
>     al-extents 257;
> 
> What is "active set"? What will be if I will set small size for it?

http://www.drbd.org/publications.html
the drbd-activity-logging pdf

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