Ramdisk size is controlled by a command-line option tha tis passed to the
kernel during boot. To see what the current size is you can run the
following:
$ dmesg | grep RAMDISK
Next, to increase the size you will need to edit /etc/grub.conf if you
use GRUB as your bootloader. You will need to find the kernel that you
boot and pass it a parameter for "ramdisk_size" as follows:
title Red Hat Linux (2.6.9-42.0.3.EL)
root (hd0,0)
kernel /vmlinuz-2.6.9-42.0.3.EL ro root-LABEL=/
ramdisk_size=98304 rhgb
In other words, add the ramdisk_size parameter to the current kernel. The
size will be in 1024-byte blocks. After you save the file, you will need
to reboot. After you reboot, run the dmesg command to see what the
current ramdisk is now.
$ dmesg | grep RAMDISK
It should give you the desired size.
On Wed, 10 Jan 2007 18:09:53 -0600 "Supriya Sriraman"
<sriraman.supriya@xxxxxxxxx> writes:
> I want to determine and increase ram size on RHEL 4.
>
> Can anyone help me with this?
>
> I need 96MB, so I used a bs of 1024 and count of 93750 for the dd
> command.
> It failed.
>
> FAILS (RHEL 4)
> ==============
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=93750
> dd: writing `/dev/ram1': No space left on device
> 16385+0 records in
> 16384+0 records out
>
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=16385
> dd: writing `/dev/ram1': No space left on device
> 16385+0 records in
> 16384+0 records out
>
> Count of 16384 works, but nothing higher does.
>
> WORKS (RHEL 4)
> ==============
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=16384
> 16384+0 records in
> 16384+0 records out
>
> dd if=/dev/zero of=/dev/ram2 bs=1024 count=16384
> 16384+0 records in
> 16384+0 records out
>
> $ cat /proc/meminfo
> MemTotal: 16574352 kB
> MemFree: 14907316 kB
> Buffers: 253092 kB
> Cached: 729308 kB
> SwapCached: 140 kB
> Active: 865416 kB
> Inactive: 272900 kB
> HighTotal: 15794176 kB
> HighFree: 14891264 kB
> LowTotal: 780176 kB
> LowFree: 16052 kB
> SwapTotal: 20414456 kB
> SwapFree: 20414316 kB
> Dirty: 8 kB
> Writeback: 0 kB
> Mapped: 195864 kB
> Slab: 496572 kB
> CommitLimit: 28701632 kB
> Committed_AS: 447724 kB
> PageTables: 5084 kB
> VmallocTotal: 106488 kB
> VmallocUsed: 12016 kB
> VmallocChunk: 94152 kB
> HugePages_Total: 0
> HugePages_Free: 0
> Hugepagesize: 2048 kB
> $ free
> total used free shared buffers
> cached
> Mem: 16574352 1667100 14907252 0 253092
> 729308
> -/+ buffers/cache: 684700 15889652
> Swap: 20414456 140 20414316
>
> I have a machine with a Debian distribution on which the dd command
> with
> 24 count=93750:
>
> DEBIAN:
> dd if=/dev/zero of=/dev/ram1 bs=1024 count=93750
> 93750+0 records in
> 93750+0 records out
>
>
> $ cat
> /proc/meminfo
>
> total: used: free: shared: buffers: cached:
> Mem: 1585790976 1579163648 6627328 0 33210368 1361088512
> Swap: 1073733632 14704640 1059028992
> MemTotal: 1548624 kB
> MemFree: 6472 kB
> MemShared: 0 kB
> Buffers: 32432 kB
> Cached: 1327956 kB
> SwapCached: 1232 kB
> Active: 938112 kB
> Inactive: 428852 kB
> HighTotal: 1048576 kB
> HighFree: 2860 kB
> LowTotal: 500048 kB
> LowFree: 3612 kB
> SwapTotal: 1048568 kB
> SwapFree: 1034208 kB
> $
> free
>
> total used free shared buffers
> cached
> Mem: 1548624 1542228 6396 0 32432
> 1328008
> -/+ buffers/cache: 181788 1366836
> Swap: 1048568 14360 1034208
>
>
> Thanks!
> --
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