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DB2 を Power Systems の内蔵ストレージで構成する場合のハードウェア構成上の注意点

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Abstract

DB2 LUW の "No File System Caching 表スペース" を Power Systems の内蔵ストレージ上に作成する場合、4K bytes/sector フォーマットではなく 512 bytes/sector のストレージを選択してください。

Content


DB2 LUW (DB2 for Linux, UNIX and Windows) の "No File System Caching 表スペース" を Power Systems の内蔵ストレージ上に作成する場合、4K bytes/sector フォーマットではなく 512 bytes/sector のストレージを選択してください。
No File System Caching を指定した表スペースは、4K bytes/sector フォーマット (Advanced Format) のストレージ上には作成できません。

PowerVC (Virtualization Center) や IBM Spectrum Protect (Tivoli Storage Manager) のようにミドルウェア内部で DB2 を使用している場合も同様であるため、ミドルウェアが管理する DB を Power Systems 内蔵ストレージ上に配置することを検討されている場合は、特にご注意ください。

※ IBM System Storage (外部ストレージ装置)を使用する場合、IBM FlashSystem 以外は 512 bytes/sector フォーマットのため、この制約には該当しません。
  IBM FlashSystem を使用する場合は、当該 DB を配置する先のボリュームは 512 bytes/sector で作成してください。


【技術的背景】
DB2 の "No File System Caching 表スペース" を使用する場合、表スペースを配置するストレージは 512 bytes/sectorフォーマットである必要があります。
参考情報:
- "CREATE TABLESPACE ステートメント" (IBM Knowledge Center)
http://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000929.html

- "Database creation is failing with "Disk full" error during DMS tablespace creation on a storage subsystem with a sector size other than 512 bytes" (Technote)
http://www.ibm.com/support/docview.wss?uid=swg21449214
※ 当 Technote では対象の DB2 は V9.5, V9.7 となっていますが、DB2 V10.5 でも同様です。

"No File System Caching" は、「DMS 表スペース」 および 「自動ストレージ 表スペース」 の標準設定(デフォルト)です。
PowerVC や IBM Spectrum Protect (TSM) は、導入時に No File System Caching の DMS 表スペースを使用する管理用 DB を自動作成します。
そのため、管理用 DB を配置する先のストレージが 4K bytes/sector フォーマットの場合は表スペースの作成がエラーとなり、導入が正常に完了しません。


【ハードウェア構成上の注意】
ミドルウェアが内部的に DB2 を使用する場合も含め、DB2 の表スペースを Power Systems の内蔵ストレージ上に作成する場合は、512 (528 を含む) bytes/sector フォーマットの機構を選択してください。
機構名に 「4K」 と記されている 4K bytes/sector フォーマットのストレージは、選択しないでください。

□ 512 bytes/sector フォーマット の内蔵ストレージ 機構の例
 ・ Power S824 の場合(*)
Disk:
(#ESD5) -600GB 10K RPM SAS SFF-3 Disk Drive (AIX/Linux)
(#ESDB) -300GB 15K RPM SAS SFF-3 Disk Drive (AIX/Linux)
(#ESDE) -571GB 15k RPM SAS SFF-3 Disk Drive - 528 Block
(#ESDF) -600GB 15k RPM SAS SFF-3 Disk Drive - 5xx Block
 ・・・
Solid State Drive:
(#ES0L) -387GB SFF-3 SSD for AIX/Linux
(#ES0N) -775GB SFF-3 SSD for AIX/Linux
 ・・・

 ・ Power S812L の場合(*)
Disk:
(#ELDB) -300GB 15K RPM SAS SFF-3 Disk Drive (Linux)
(#ELDF) -600GB 15k RPM SAS SFF-3 Disk Drive - 5xx Block
(#ELDT) -146GB 15k RPM SAS SFF-3 Disk Drive (Linux) (*注: No Longer Available as of July 8, 2016)
 ・・・
Solid State Drive:
(#EL13) -775GB SFF-3 SSD for Linux
(#EL14) -387GB SFF-3 SSD for Linux
 ・・・

□ 4K bytes/sector フォーマット の内蔵ストレージ 機構の例
 ・ Power S824 の場合(*)
Disk:
(#ESF4) -571GB 10K RPM SAS SFF-3 Disk Drive 4K Block - 4224
(#ESF5) -600GB 10K RPM SAS SFF-3 Disk Drive 4K Block - 4096
 ・・・
Solid State Drive:
(#ES0U) -387GB SFF-3 4k SSD AIX/Linux
(#ES0W) -775GB SFF-3 4k SSD for AIX/Linux
 ・・・

 ・ Power S812L の場合(*)
Disk:
(#ELF5) -600GB 10K RPM SAS SFF-3 Disk Drive 4K Block - 4096
(#ELF9) -1.2TB 10K RPM SAS SFF-3 Disk Drive 4K Block - 4096
 ・・・
Solid State Drive:
(#EL4U) -387GB SFF-3 4K SSD for Linux
(#EL4W) -775GB SFF-3 4K SSD for Linux
 ・・・

(*) Sales Manual より、特定のモデルの一部の機構を抜粋しています。全ての機構を網羅しているわけではありませんのでご注意ください。機構の詳細については、各モデルの Sales Manual にてご確認ください。


以上

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Historical Number

20F23F721123AAF649257F5C002869B3

Product Alias/Synonym

対象システム:Power Systems;AIX;Linux;DB2

Document Information

Modified date:
17 June 2018

UID

jpn1J1013042