CANT MAKE RAM DISK HIGHER THAN 4096 DRIVER
RAMDISK driver initialized: 16 RAM disks of 16000K size 1024 blocksize After the reboot, a look at the dmesg output should confirm the change has taken effect: Once you save the file, you will need to reboot your system.
# kernel /vmlinuz-version ro root=/dev/hda5 # all kernel and initrd paths are relative to /boot/, eg. # Note that you do not have to rerun grub after making changes to this file Here is what I will add to /etc/nf to configure 16 MB ramdisks: The kernel option for ramdisk size is: ramdisk_size=xxxxx, where xxxxx is the size expressed in 1024-byte blocks. Since GRUB is the default bootloader for Red Hat 9, I will modify /etc/nf with the new kernel option. Ramdisk size is controlled by a command-line option that is passed to the kernel during boot. I want a 16 MB ramdisk, so the next step will be to configure Linux to use a larger ramdisk size during boot. RAMDISK: Compressed image found at block 0Īs you can see, the default ramdisk size is 4 MB. RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize Now, grep through dmesg output to find out what size the ramdisks are: Lrwxrwxrwx 1 root root 4 Jun 12 00:31 /dev/ramdisk -> ram0 Lrwxrwxrwx 1 root root 4 Jun 12 00:31 /dev/ram -> ram1 To check these block devices out, use the following command: It lists devices ram0 – ram 19, but only ram0 – ram15 are usable by default. Red Hat creates 16 ramdisks by default, although they are not “active” or using any RAM. Step 1: Take a look at what has already been created by your system The exact version of the kernel that I used was: 2.4.20-20.9 My test machine was a Pentium 4 and had 256 MB of RAM. I am also assuming that the distribution you are using already has ramdisk support compiled into the kernel. I was using Red Hat 9 for this test, but it should work with other GNU/Linux distributions running 2.4.x kernels. This document should take you step-by-step through the process of creating and using RAM disks. At the time, that disk was so large that I never even considered filling it up, and I never did! I also found it amazing that I could easily create a “virtual disk” in RAM that is larger than my first hard drive, a 20 MB Winchester disk.
I did not want the unencrypted documents to be written to any physical media on my workstation. Why did I write this document? Because I needed to setup a 16 MB ramdisk for viewing and creating encrypted documents. Mounting Loopback file systems (such as run-from-floppy/CD distributions) Working with the unencrypted data from encrypted documents Ramdisks are useful for a number of things, including: The Linux kernel version 2.4 has built-in support for ramdisks. RAM disks can be a great place to store temporary data. However, any data stored on a RAM disk is lost when the system is shut down or powered off. Access time is much faster for a RAM disk than for a real, physical disk. RAM disks have fixed sizes, and act like regular disk partitions. What is a RAM disk? A RAM disk is a portion of RAM which is being used as if it were a disk drive.
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