Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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?
I have 1,2 TB RAID array as low-level storage for DRBD. How to determine
optimal value for al-extents parameter? Is it depends on disk size or number
of files or activity on that disk?
Thanks.