Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 107)

Brocade Virtual ADX Server Load Balancing Guide 91
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Hash-based SLB with server persistence
2
The Brocade Virtual ADX now attempts to reassign 3 persistent hash entries to the new real server
over 2 minutes. The system will stop after it has reassigned 2 entries of real server rs1 to new real
server rs3. The reason is that when rs3 is assigned 2 persistent hash entries, the value is equal to
the number of entries assigned to existing real server rs2.
Figure 17 shows the persistent hash table after the reassignment.
FIGURE 17 Hash table after reassignment
Keeping the persistent hash table unchanged
To configure the Brocade Virtual ADX not to clear the persistent hashing table when multiple
servers come up simultaneously and need reassignment, enter commands such as the following.
SLB-Virtual ADX(config)#server virtual-name-or-ip vs1
SLB-Virtual ADX(config-vs-vs1)#port http no-auto-clear-persist-hash-buckets
If this command is configured and multiple servers need reassignment simultaneously, then the
Brocade Virtual ADX will leave the persistent hash table unchanged.
Syntax: port port no-auto-clear-persist-hash-buckets
virtual server vs1 port http
Persistent Hash table
Hash 0 none
Hash 1 none
..............
Hash 47 rs3
Hash 49 rs1
Hash 55 rs2
Hash 53 rs1
Hash 54 rs1
Hash 56 rs2
Hash 48 rs3
Hash 50 rs1
Hash 51 rs1
Hash 52 rs1
Hash 255 none
..............