Very low performance issue

[rFlex]

*-----------------------------------------------------------------------------*
ifconfig -a
*-----------------------------------------------------------------------------*

bond0 Link encap:Ethernet HWaddr 02:4B:F6:97:7C:1F
inet addr:188.XXX.XXX.XXX Bcast:188.XXX.XXX.XXX Mask:255.255.255.240
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:2275004 errors:0 dropped:0 overruns:0 frame:0
TX packets:4133574 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:157889545 (150.5 MiB) TX bytes:6054399402 (5.6 GiB)

eth0 Link encap:Ethernet HWaddr 02:4B:F6:97:7C:1F
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:745161 errors:0 dropped:0 overruns:0 frame:0
TX packets:1324506 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:53462615 (50.9 MiB) TX bytes:1958278490 (1.8 GiB)

eth1 Link encap:Ethernet HWaddr 02:4B:F6:97:7C:1F
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:145475 errors:0 dropped:0 overruns:0 frame:0
TX packets:1867 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9769126 (9.3 MiB) TX bytes:232141 (226.7 KiB)

eth2 Link encap:Ethernet HWaddr 02:4B:F6:97:7C:1F
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:1384368 errors:0 dropped:0 overruns:0 frame:0
TX packets:2807201 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:94657804 (90.2 MiB) TX bytes:4095888771 (3.8 GiB)

ipddp0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
BROADCAST NOARP MULTICAST MTU:585 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2093649 errors:0 dropped:0 overruns:0 frame:0
TX packets:2093649 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:338331735 (322.6 MiB) TX bytes:338331735 (322.6 MiB)

[Pi-L]

So far looks fine, next steps to determine what is slowing everything down may be:
- disable bonding and use single Ethernet controller
- test the system without s/w raid, check if raid has completed initialization, which is a huge load for a cpu
- make sure option WB (WriteBack caching) is enabled when assigning volume to iSCSI target, which will slightly speed up data writing

After testing few possibilities you should be able to find the weakest link.