Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [ramdisk]

84 questions
96
votes
8 answers

Creating a ram disk on Linux

I have a machine with 62GB of RAM, and a trunk that's only 7GB, so I thought I would create a RAM disk and compile there. I am not a Linux expert. I found instructions on the internet to create the RAM disk: mkfs -q /dev/ram1 8192 but I changed…
Frank
  • 961
  • 1
  • 7
  • 3
19
votes
9 answers

Is there a linux OS that can be loaded entirely into RAM?

I have 32 GB of memory in my PC. This is more than enough for a linux OS. Is there an easy to use version of Linux (Ubuntu preferably) that can be booted via optical or USB disk and be run completely within RAM? I know a live disc can be booted with…
user208145
  • 2,437
  • 2
  • 20
  • 21
13
votes
2 answers

Reserve fixed RAM memory region as a block device ( with a given start physical address)

There have been a lot of questions about RAM Disks and I am aware of ramfs and tmpfs which allow the use of ram as a block device. However my interest is in using a fixed memory address range as a block device. This arises from the necessity to use…
qstack
  • 233
  • 2
  • 5
12
votes
1 answer

Where does tmpfs come from and how is it mounted

I am using a BeagleBone board with Linux. When i type command "df -h" , I see tmpfs is mounted a few times. Does this mean that all these entries get mounted at the same place, or at a different part of the tmpfs? It brings me to another thing I…
Engineer999
  • 1,111
  • 2
  • 15
  • 32
10
votes
3 answers

Debian 8 KVM Guest - Loading initial ramdisk

I have updated my KVM management script for Ubuntu 14.04 KVM hosts to support debian 8 guests. After a manual installation (preseed script does not work yet), I am stuck with the the following message on bootup: During the installation,…
Programster
  • 2,157
  • 9
  • 23
  • 35
9
votes
1 answer

Can you throttle the bandwidth to a tmpfs based ramdisk?

I created a ramdisk using tmpfs as follows: sudo mount -t tmpfs -o size=1024m tmpfs /myramdisk I was looking into cgroup blkio subsystem bandwidth limits "read_bps_device" and "write_bps_device" but they seem to require the major and minor number…
weirdbluelights
  • 91
  • 3
8
votes
3 answers

Ubuntu 21.04 hangs at "loading initial ramdisk" after kernel update with LUKS

I've reproduced this twice from a fresh install - the setup initially works fine, but when a kernel update is applied, the system hangs on reboot. Selecting the older kernel I have available from GRUB works fine. System details: XPS 13…
Bereded
  • 81
  • 1
  • 2
8
votes
3 answers

RAM alternative to swap partion or swap file on an SSD

My Debian stretch system has a lot of RAM. Currently, it uses an encrypted swap partition on the SSD, but under normal conditions I don't ever expect lack of memory to cause it to be used. But turning off swap completely is a bad idea according to…
user87218721
  • 79
  • 1
  • 3
7
votes
1 answer

How to specify memory region for ramdrive

We are setting up a Linux based benchmarking cluster. Each node is going to be a headless, diskless machine, booted via tftp, the OS copied to a local ramdrive, and the same ramdrive is used as local drive by the benchmarked application. My problem…
LaszloLadanyi
  • 143
  • 5
7
votes
0 answers

Tmpfs with overflow on disk?

I'm looking for a way to have a tmpfs-like file system that can be unlimited in size, but will use a specified amount of RAM after which the "oversize" data will be stored on another disk-backed filesystem I'm running on a SSD-only system, with low…
mickael9
  • 171
  • 3
6
votes
1 answer

Regarding the creation and destruction of sensitive data on linux/unix systems

In modern file systems (and on modern SSDs) there is no guarantee that if you write over a file using a traditional utility (such as dd) that the data will be overwritten in-place and journaled backups destroyed. As a result, the data could…
Schives
  • 699
  • 4
  • 12
6
votes
2 answers

How to deallocate /dev/ram0

I have allocated /dev/ram0: dd if=/dev/zero of=/dev/ram0 bs=1M count=1024 Now I have 1Gb sitting in memory. How do I free up the allocated space?
Thomas Keller
  • 62
  • 1
  • 3
  • 16
5
votes
1 answer

Measurement of free ram through /proc/meminfo with ramdisk (initrd)

I am booting a disk image via PXE, it is a full system on an initrd ramdisk. I would like to measure the actual free memory of the system (not including buffers and file system caching). I was told this is done by adding the MemFree, Buffers and…
dfens123
  • 123
  • 4
5
votes
1 answer

How to deallocate Linux RAMdisk

I am having trouble to deallocate RAMdisk in Linux. I think that blockdev --flushbufs /dev/ram0 used to work in the past. But now: cat /dev/urandom > /dev/ram0 md5sum /dev/ram0 c71df700969640324b201ae5f7a96c41 /dev/ram0 blockdev -v --flushbufs…
John Lee McMahon
  • 841
  • 4
  • 6
5
votes
1 answer

Cannot create NFS on a tmpfs drive

OS: SLES 12.3 Running these commands: mkdir /foo/ramdisk mount -t tmpfs -o size=100m tmpfs /foo/ramdisk Creating a NFS on /foo/ramdisk produces this result when I run showmount -e : clnt_create: RPC: Program not registered When I remove the…
Peter VARGA
  • 992
  • 3
  • 11
  • 28
1
2 3 4 5 6