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RAMDISK – B-LOG https://blog.bugyo.tk/b-log bugyoのlog。決してblogではない。 Thu, 26 Mar 2009 13:33:33 +0000 en-US hourly 1 https://wordpress.org/?v=5.7.2 FreeBSDでRAMDISK https://blog.bugyo.tk/b-log/archives/320 https://blog.bugyo.tk/b-log/archives/320#respond Thu, 26 Mar 2009 13:23:29 +0000
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http://www.kitcc.org/~bugyo/b-log/?p=320 Continue reading FreeBSDでRAMDISK]]> FreeBSDでは仮想ディスクを提供するドライバmdが用意されている。

mdconfigコマンドでmd*に仮想ディスクを追加、削除できる。

RAMディスクを作成するには。

# mdconfig -a -t malloc -s 256m -u 1

などとする。
-sにはサイズ、-uには/dev/mdに続くデバイスファイルの番号を指定する。
-tにはmalloc、vnode、swapが指定できて、mallocを指定した場合には記憶領域をmalloc(9)を用いて確保する。

あとは通常のディスク同様、

# newfs -U md1
# mount /dev/md1 /mnt

としてマウントする。

仮想ディスクを解放するときは、umountした後、

#mdconfig -d -u 1

として指定した番号の仮想ディスクを削除する。

mdmfsコマンドを使えば以上のことが1コマンドで出来る。

mdmfs -M -s 5m md2 /mnt

-Mオプションは記憶領域をmallocを用いて確保するように指示する。

参考:
FreeBSD ハンドブック 15.10. ネットワーク、メモリ、そしてファイルベースのファイルシステム

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