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Ubuntu & Debian Ramdisk

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Panupong Chantaklang

on 1 July 2011

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Transcript of Ubuntu & Debian Ramdisk

Ubuntu & Debian RAM Disk What is RAM Disk Why Use RAM disk How to make RAM disk Squashfs !! Make Java run In RAM Step 1. Create RAM disk Step 2. Create JAVA squashfs Step 3. Mount Java to RAM Step 4. Set Java to default Make squashfs file A RAM disk or RAM drive is a block of RAM (primary storage or volatile memory) that a computer's software is treating as if the memory were a disk drive (secondary storage) RAM > SSD > HDD Speed Capacity & Price HDD > SSD > RAM !! But We Have More RAM [ 4 GB ] !! Use tmpfs $shell > sudo mkdir /media/ramdisk
$shell > sudo mount -t tmpfs tmpfs /media/ramdisk Mount on Start up edit file /etc/fstab add to last line tmpfs /media/ramdisk tmpfs defaults,mode=1777 0 0 And reboot System Compressed read-only file system for Linux. SquashFS compresses files, inodes and directories, and supports block sizes up to 1 MB for greater compression.
SquashFS is also free software (licensed under the GPL) for accessing SquashFS filesystems.
SquashFS is intended for general read-only file system use and in constrained block device/memory systems (e.g. embedded systems) where low overhead is needed. The standard version of SquashFS uses gzip compression, although there is also a project that brings LZMA compression to SquashFS. Install squasfsh tools sudo apt-get install squashfs-tools Create .sqsh file mksquashfs /usr/lib/jvm/java-6-sun- /home/nancom/jdk6.sqsh Unsquash unsquashfs [options] target [files/directories to extract] $shell > sudo mount /home/nancom/jdk6.sqsh /media/ramdisk -t squashfs -o loop sudo update-alternatives --install "/usr/bin/java" "java" "/media/ramdisk/bin/java" 1 Check install java complete sudo update-alternatives --config java !! And choose java in ram !! !! Finish !! !! Make it permanant on startup !! Edit /etc/fstab add line /home/nancom/jdk6.sqsh /media/ramdisk squashfs ro,defaults,loop 0 0
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