DS224C / DS2246混在シェルフスタックのドライブへのアクセス時のレイテンシ

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環境

ONTAP 9
DS224CおよびDS2246

問題

DS2246シェルフシャーシ経由のパス経由でDS224Cシェルフのドライブにアクセスしたときのドライブ読み取りレイテンシ
DS2246シェルフにはIOM12が搭載されていますが、シャーシは6Gb/秒でドライブにアクセスしています

シェルフスタックの例：

Expanders on channel 1a:
 Level    1: WWN 500a098008116b35, ID 31, Serial Number ' SHFGD0000000003', Product 'DS22412IOM12A   ', Rev '0270', Slot A
 Level    2: WWN 500a0980080b0161, ID 32, Serial Number ' SHFGD0000000001', Product 'DS22412IOM12A   ', Rev '0270', Slot A
 Level    3: WWN 500a0980081ee179, ID 33, Serial Number ' SHFGD0000000002', Product 'DS224IOM12A     ', Rev '0270', Slot A
 
 Expanders on channel 9b:
 Level    1: WWN 500a0980081ddddd, ID 33, Serial Number ' SHFGD0000000002', Product 'DS224IOM12A     ', Rev '0270', Slot B
 Level    2: WWN 500a0980080af8a5, ID 32, Serial Number ' SHFGD0000000001', Product 'DS22412IOM12A   ', Rev '0270', Slot B
 Level    3: WWN 500a098008116de5, ID 31, Serial Number ' SHFGD0000000003', Product 'DS22412IOM12A   ', Rev '0270', Slot B

シェルフエキスパンダの例：

Expander phy state on 1a.33 (NETAPP :DS224IOM12A SHFGD0000000002): Pwr Invald Disprt Loss Phy CRC Phy Pwr Ccl Rsv Rls DWord Error Sync Reset Error Change SATA PHY/BAY STATE ON Cnt Cnt Cnt Count Count Count Prob Cnt Cnt Affiliation ------- ----------------- --- --- --- --- ------ ------ ------ ------ ------ ------ ---------------- 0/P0:0 12.0 Gb/s --- --- --- --- 0 0 0 0 0 1 ---------------- 1/P0:1 12.0 Gb/s --- --- --- --- 0 0 0 0 0 1 ---------------- 2/P0:2 12.0 Gb/s --- --- --- --- 0 0 0 0 0 1 ---------------- 3/P0:3 12.0 Gb/s --- --- --- --- 0 0 0 0 0 1 ---------------- 4/P1:0 Disabled 5/P1:1 Disabled 6/P1:2 Disabled 7/P1:3 Disabled 8/P2:0 12.0 Gb/s --- --- --- --- 0 0 0 0 0 13 ---------------- 9/P2:1 12.0 Gb/s --- --- --- --- 0 0 0 0 0 13 ---------------- 10/P2:2 12.0 Gb/s --- --- --- --- 0 0 0 0 0 13 ---------------- 11/P2:3 12.0 Gb/s --- --- --- --- 0 0 0 0 0 13 ---------------- 12/P3:0 Disabled 13/P3:1 Disabled 14/P3:2 Disabled 15/P3:3 Disabled 16/0 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 17/1 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 18/2 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 19/3 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 20/4 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 21/5 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 22/6 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 23/7 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ---------------- 24/8 6.0 Gb/s YES 0 0 0 0 0 0 0 0 1 ----------------