RAID10 のlayoutオプションを変えてみる

RAID10の構築オプション layout を変えてみて、どの程度パフォーマンスが変化するか見てみます。

ただし、4TBで構築すると、createだけでも１回５時間以上掛かるので、３０GBほどパーティションを切り出して、試しました。

（その影響がfarとかであるかも。）

near=2

far=2

offset=2

この３パターンで試します。

コマンド的には、この３パターンです。

# mdadm --create /dev/md0 --raid-devices=4 --level=raid10 --chunk=64 --layout=n2 -v /dev/sd[abcd]1

# mdadm --create /dev/md0 --raid-devices=4 --level=raid10 --chunk=64 --layout=f2 -v /dev/sd[abcd]1

# mdadm --create /dev/md0 --raid-devices=4 --level=raid10 --chunk=64 --layout=o2 -v /dev/sd[abcd]1

で、bonnie++の結果。

                        mke2fs option

一般的に書き込みは （速）near > offset > far（遅）と言われているようなのですが、

ちょっと微妙な結果です 

次回、far=2として、chunk size などを変えて、ベンチマークしてみます。

ベンチマーク時のマシンスペック

CPU:Intel E3200

HDD:HGST HDS722020ALA330

Linux software RAIDを使って、RAIDを構築。

（追記）strideとstripe-width の計算を間違えています。。

タグ：RAID構築

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