RAMify

RAMify is a script that allows you to cache a folder's contents in a RAM disk to improve read performance. It creates a shadow folder on the disk that mirrors the contents of the RAM disk and syncs any changes back to the shadow folder.

Usage

./ramify.sh [-s <size>] /path/to/folder

Options

• -s <size>: Optional. Specify the size (in KB) of the tmpfs mount (RAM disk). If not specified, the script will calculate the size based on the folder size, adding a 10% buffer.

Arguments

• /path/to/folder: The folder you want to cache in the RAM disk.

How it works

1. Moves the target folder to a shadow folder (with a .ramify suffix).
2. Creates a tmpfs mount (RAM disk) at the target folder's original location.
3. Copies the contents of the shadow folder to the RAM disk.
4. Uses inotifywait to monitor changes in the RAM disk.
5. Syncs the changes from the RAM disk back to the shadow folder using rsync.

Prerequisites

• Bash
• Python (used for calculating the RAM disk size)
• Inotify tools (inotifywait command)
• Rsync

Installation

1. Save the script as ramify.sh.
2. Make the script executable with chmod +x ramify.sh.

Example

Cache the contents of the folder /path/to/your-folder in a RAM disk:

sudo ./ramify.sh /path/to/your-folder

Cache the contents of the folder /path/to/your-folder in a RAM disk with a user-defined size of 2048 KB:

sudo ./ramify.sh -s 2048 /path/to/your-folder

Notes

• The script must be run as root (or with sudo) to create the tmpfs mount and move the original folder.
• If the script is interrupted or terminated, it will automatically sync the contents of the RAM disk back to the shadow folder, unmount the tmpfs, and move the shadow folder back to its original location.

RAM Disk RAID

This script creates a RAID 1 array with a RAM disk and a folder on your filesystem. It is designed to improve read performance while still retaining data durability in case of a crash.

Usage

sudo ./ram_disk_raid.sh /path/to/folder

Arguments

• /path/to/folder: The folder you want to include in the RAID 1 array with a RAM disk.

How it works

1. Creates a directory in the /mnt/tmpfs folder to store a copy of the target folder.
2. Copies the contents of the target folder to the new directory in the /mnt/tmpfs folder.
3. Binds the folders to loopback devices (e.g., /dev/loop0 and /dev/loop1).
4. Creates a RAID 1 array using the loopback devices, marking the real disk folder as "write-mostly".
5. Mounts the RAID 1 array to the original folder location.

Prerequisites

• Bash
• mdadm

Installation

1. Save the script as ram_disk_raid.sh.
2. Make the script executable with chmod +x ram_disk_raid.sh.

Example

Create a RAID 1 array with a RAM disk for the folder /path/to/your-folder:

sudo ./ram_disk_raid.sh /path/to/your-folder

Notes

• The script must be run as root (or with sudo) to create the RAID 1 array and mount it.
• The script does not implement automatic syncing or cleanup on exit. If you need to update the original folder, you will need to manually stop the RAID 1 array and sync the data back to the folder.