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Storage Capacity Unit (SCU)
By
Keigo Matsubara
posted
Wed May 06, 2020 12:13 AM
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Storage Capacity Unit (SCU) とは、IBM System Storage 製品が提供する各種機能の従量課金単位です。
2020年2月11日現在
IBM Spectrum Virtualize
*, IBM Virtual Storage Center (VSC)*,
IBM Spectrum Control
** 製品に対して SCU 単位の課金方式が適用
*
IBM SAN Volume Controller
あるいは
IBM FlashSystem
上で外部仮想化機能を利用する場合、課金対象の外部ストレージのボリューム容量合計値(管理対象容量と呼ぶ)とドライブ種別に応じた SCU 単位のライセンスを購入
外部仮想化対象ストレージ装置が圧縮や重複排除などのデータ削減技術を利用する場合、申請ベースで使用可能容量(物理容量)に相当する SCU 課金単位のオプション・ライセンスの適用が認められる(要承認)
** 筐体単位課金の Select Editions も提供
IBM FlashSystem 製品
内蔵のストレージ容量に関しては筐体単位の課金方式が適用
対象となるストレージのドライブ種別に応じたストレージ・カテゴリーが設定されており、各カテゴリーごとに単位容量(TiB)あたりのSCU 換算率が異なる(下表参照)
ストレージ・カテゴリー
SCU カテゴリー
SCU 換算率
Storage Class Memory (SCM)
IBM Spectrum Virtualize for Public Cloud (SV4PC)
カテゴリー 1
1 TiB = 1 SCU
フラッシュ・ドライブ(NVMe あるいは SAS 接続形態を問わない)
FlashCore Module (FCM) および汎用 SSD 含む
カテゴリー 2
1 TiB = 0.847 SCU
10k RPM, 15k RPM HDD ストレージ
カテゴリー 4 のドライブを搭載するがハイエンド・ストレージの機能を有するもの
例: IBM XIV
カテゴリー 3
1 TiB = 0.50 SCU
NL-SAS HDD / SATA HDD ストレージ
カテゴリー 4
1 TiB = 0.25 SCU
#scu
#scm
#sas
#fcm
#ssd
#xiv
#sas-hdd
#nl-sas-hdd
#spectrum-control
#svc
#external-virtualization
#vsc
#nvme
#capacity
#used-capacity
#usable-capacity
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