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Cinder ドライバーが NetApp API failed で初期化に失敗します。理由-408:Request Timeout

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Category:
openstack
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virt
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環境

  • OpenStack Cinder で NetApp ONTAP ドライバーを使用する
  • Red Hat OpenStack Platform(RHOSP)
  • Cinder ホストと ONTAP の間に中間ネットワーク機器が存在する環境

問題

OpenStack Cinder ドライバは、NetApp ONTAP バックエンド ストレージ用に設定されている場合、初期化に失敗します。次のエラーが Cinder ログに繰り返し表示されます:

Failed to initialize driver.: cinder.volume.drivers.netapp.dataontap.client.api.NaApiError: NetApp API failed. Reason-408: Request Timeoutcinder.volume.manager urllib.error.HTTPError: HTTPError 408: Request Timeout
cinder.volume.drivers.netapp.dataontap.client.api.NaApiError: NetApp API failed. Reason-408: Request Timeout

検証:
パケット サイズを増やしてpingテストを実行し、MTUの動作を確認します。

コマンド例:
ping -M do -s 1620 <ONTAP-IP>
ping -M do -s 1621 <ONTAP-IP>
ping <ONTAP-IP> vrf <VRF_NAME> packet-size 1620
ping <ONTAP-IP> vrf <VRF_NAME> packet-size 1621

注:
<VRF_NAME> = ルータ上の仮想ルーティングおよび転送テーブル(アウトオブバンド管理VRFなど)。
<ONTAP-IP> = ONTAPクラスタ管理IP。

サンプル出力:

 成功事例

RHEL3# ping 10.x.x.x vrf <VRF_NAME> packet-size 1620
PING 10.x.x.x (10.x.x.x): 1620 data bytes
1628 bytes from 10.x.x.x: icmp_seq0 ttl=63 time=0.886 ms
1628 bytes from 10.x.x.x: icmp_seq1 ttl=63 time=0.705 ms
1628 bytes from 10.x.x.x: icmp_seq2 ttl=63 time=0.785 ms
1628 bytes from 10.x.x.x: icmp_seq3 ttl=63 time=0.697 ms
1628 bytes from 10.x.x.x: icmp_seq4 ttl=63 time=0.646 ms

--- <IP_ADDRESS> ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 0.646/0.705/0.886 ms

障害ケース

RHEL3# ping 10.x.x.x vrf <VRF_NAME> packet-size 1621
PING 10.x.x.x (10.x.x.x): 1621 data bytes
Request 1 timed out
Request 2 timed out
Request 3 timed out
Request 4 timed out
Request 5 timed out

--- <IP_ADDRESS> ping statistics ---
5 packets transmitted, 0 packets received, 100.00% packet loss

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