Slow read performance on iscsi SAN

[Testani]

Hi all,
we are going to build a production 3 node cluster use an ISCSI 10gb SAN Lenovo DE.

We are at the beginning and we have configured the first node using two 10gb network cards and a single LUN on the SAN.I attach the multipath configuration, the paths that are active and the performance I obtain.Anyone in my situation or can give me some advice?All mtu are set to 1500, changing to 9000 has no effect.Thank you

here my multipath.conf:


blacklist {


wwid .*


}





blacklist_exceptions {


wwid "36d039ea000bc680e000000ff66fd6ed2"


}





multipaths {


multipath {


wwid "36d039ea000bc680e000000ff66fd6ed2"


alias mpath0


}


}





defaults {


polling_interval 2


path_selector "round-robin 0"


path_grouping_policy multibus


uid_attribute ID_SERIAL


rr_min_io 100


failback immediate


no_path_retry queue


user_friendly_names yes


}








devices {


device {


vendor "LENOVO"


product "DE_Series"


product_blacklist "Universal Xport"


path_grouping_policy "group_by_prio"


path_checker "rdac"


features "2 pg_init_retries 50"


hardware_handler "1 rdac"


prio "rdac"


failback immediate


rr_weight "uniform"


no_path_retry 30


retain_attached_hw_handler yes


detect_prio yes


}


}