128 Introduction to IBM Real-time Compression Appliances
The port connectivity that belongs to the solution in Figure 9-5 is illustrated in Table 9-3.
Table 9-3 N series single-node, active/passive path failover to HA pair port connectivity
The N series virtual interface configuration is illustrated in Example 9-2.
Example 9-2 Active/passive path failover to RTCA product HA pair- N series vif configuration
NAS1> vif status
default: transmit 'IP Load balancing', VIF Type 'multi_mode', fail 'log'
vif-s: 1 link, transmit 'none', VIF Type 'single_mode' fail 'default'
VIF Status Up Addr_set
up:
e0a: state up, since 31Mar2011 18:43:52 (00:00:23)
mediatype: auto-1000t-fd-up
flags: enabled
input packets 13, input bytes 1062
output packets 4, output bytes 168
output probe packets 4, input probe packets 0
strike count: 4 of 10
up indications 1, broken indications 0
drops (if) 0, drops (link) 0
indication: up at 31Mar2011 18:43:52
consecutive 22, transitions 1
down:
e0c: state down, since 31Mar2011 18:43:52 (00:00:23)
mediatype: auto-1000t-fd-up
flags: enabled
input packets 0, input bytes 0
output packets 13, output bytes 570
output probe packets 4, input probe packets 0
strike count: 4 of 10
up indications 1, broken indications 0
drops (if) 0, drops (link) 0
indication: up at 31Mar2011 18:43:52
consecutive 22, transitions 1
9.2.4 Active/passive path, RTCA product HA, EtherChannel/LACP bonds
The most common use of active/passive bonds is when they will combined with EtherChannel
or LACP bonds. This provides the best combination of performance and high availability. In
Figure 9-6, the N series single-node system is connected with two or more interfaces to the
RTCA product—configured as a single port aggregate (virtual interface)—either an
EtherChannel or 802.3ad (LACP) bond type.
Switch/
port
RTCA/
port
Bond Bridge Bond RTCA/
port
NAS port/
vif
SW1/
9
STN1/
eth1
n/a br0 n/a STN1/
eth0
NAS1 e0a/
vif-s
SW2/
9
STN2/
eth1
n/a br0 n/a STN2/
eth0
NAS1 e0c/
vif-s
Tip: Make sure that all active links of the same link aggregation (LACP or EtherChannel)
are connected to the same RTCA product.
Chapter 9. NAS / N series solution design 129
Similarly, a corresponding bond in the RTCA product is connected to the network switch. An
additional bond is connected to a standby RTCA product in the same manner, and its
corresponding bond connected to the network switch – be it the same one or another switch
(Figure 9-6).
Figure 9-6 N series single-node, active/passive path failover to HA pair, EtherChannel or LACP bonds
The port connectivity that belongs to the solution in Figure 9-6 is illustrated in Table 9-4.
Table 9-4 N series single-node with EtherChannel or LACP bonds
The virtual interfaces vifa and vifb are configured as dynamic multimode vif and are grouped
by creating a second layer of vif, called vif1 as a single-mode vif. Either vifa or vifb is active.
In this way, data will be transmitted through one RTCA product only and not at any time
through both concurrently. The necessary configuration entries of the /etc/rc file are shown in
Example 9-3.
Example 9-3 N series or LACP port aggregation configuration entry in /etc/rc
vif create lacp vifa -b ip e0a e0c
vif create lacp vifb -b ip e0b e0d
vif create single vif1 vifb vifa
Switch/
port
RTCA/
port
Bond Bridge Bond RTCA/
port
NAS port/
vif
SW1/
9
STN1/
eth1
bond0
LACP
br0
bond1
LACP
STN1/
eth0
NAS1 e0a/
vifa
SW1/
13
STN1/
eth5
bond0
LACP
bond1
LACP
STN1/
eth4
NAS1 e0c/
vifa
SW2/
35
STN2/
eth9
bond0
LACP
br0
bond1
LACP
STN2/
eth8
NAS1 e0b/
vifb
SW2/
41
STN2/
eth13
bond0
LACP
bond1
LACP
STN2/
eth12
NAS1 e0d/
vifb

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