[SATLUG] July Meeting - Thursday, the 12th

Craig sargonemail at gmail.com
Sat Jul 7 22:36:33 CDT 2012


Arrg... KISS method.. (as long as one isn't going the LFS way)..
Option 7: Reboot using CD/DVD w/ live distro -- RAM only / no other
commands needed!
              Challenging setup is to do the above using a VM running
ONLY in RAM.
               At least then, the CD/DVD live distro is optional!

On 7/7/12, Craig <sargonemail at gmail.com> wrote:
>>Bruce Dubbs bruce.dubbs at gmail.com
>>on Fri Jul 6 16:34:20 CDT 2012 wrote:
>>
>>Howard Haradon wrote:
>>> Hi,  We have had some suggestions about possible topics,
>>> but lack discussion leaders.
>>
>>> * A mini how-to for creating ram disks (I might be able to
>>>    get something going on this, if there is interest.)
> Pieces are need for bits/nibbles/bytes to generate interest.
>
>>
>>sudo mkdir /mnt/ram
>>sudo mount -t tmpfs tmpfs /mnt/ram
>>cd /mnt/ram
> Given Bruce's response I'll assume that this isn't a Ford
> or Dodge radio w/ dvd/cd option discussion.
> I'll stay away from the cramfs stuff, since it's not near
> the typical semester finals time; which still leaves several
> approaches/variations to the above.
> Good luck with kernel versions prior to 2.4 (hardware options
> not withstanding)
>
> state the case (ramdisk):
> {
> Option #0:
> http://www.schmut.com/cheat-sheets/linux-ram-disk
>> sudo mkdir /ramdisk
>> sudo mount -t tmpfs none /ramdisk -o
>> size=256M,mode=1777,noexec,nosuid,nodev
> See http://www.ihelm.org.uk/2010/04/resizing-ram-disk-in-linux-devshm/
> for resizing
>
> Option #1:
> http://mist.cs.st-andrews.ac.uk/blog/?p=263 has a simpler method
> or short howto -> http://linuxaria.com/pills/ram-disk-on-linux?lang=en
> a) > sudo vim /etc/fstab
> b) Locate or create the line of /dev/shm
> # e.g. 512MB:
> tmpfs      /dev/shm      tmpfs   defaults,size=512m   0   0
> c) To make change effective immediately without a reboot
>> sudo mount -o remount /dev/shm
>
> Option #2:
> http://www.cyberciti.biz/faq/howto-create-linux-ram-disk-filesystem/ )
> You can create the ram disk as follows (8192 = 8M, no need to format
> the ramdisk as a journaling file system) :
>> mkfs -q /dev/ram1 8192
>> mkdir -p /ramcache
>> mount /dev/ram1 /ramcache
>> df -H | grep ramcache
>
> Option #3:
> 1) > sudo init 0
> 2) do hardware install of physical ram w/ ide/sata/pci/epci
>    or other appropriate interface.
>    e.g.http://www.ramsan.com/products/rackmount-flash-storage/ramsan-630
>        http://techreport.com/articles.x/9312
> http://www.starwindsoftware.com/high-performance-ram-disk-emulator
> http://www.newegg.com/Product/Product.aspx?Item=N82E16815168001
> http://www.tomshardware.com/reviews/hyperos-dram-hard-drive-block,1186.html
>
> 3) Format/mount the ram like any other file system.
>
> Option #4:
> 1) > sudo init 0
> 2) Install removeable hard drive interface
> 3) "Ram" the disk into removeable hard drive interface (before or after
> boot)
> 4) After boot, format/mount disk with suitable command
>
> Option #5:
> Actual stock PC ram disk setup:
> http://www.vanemery.com/Linux/Ramdisk/ramdisk.html
> Using a RAM disk :
> http://www.linuxfocus.org/English/November1999/article124.html
>
> Option #6: for kernels prior to 2.4
> Use Rapiddisk (or other ramdisk/cache links) :
> http://rapiddisk.org/index.php?title=Main_Page (or other related ramdisk
> links)
> This permits swappable ramdisks/caching, unlike standard RAM mounted
> systems.
> Other "links" listed on the above page pertain to RamCloud /
> CompCache / dm-cache / Bcache / flashcache
> Compcache http://code.google.com/p/compcache/ is an in memory swap
> disk (compressed)
> Temp disk space would be another good canidate usage for a ram disk.
>
> }
> end state case(ramdisk)
>


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