Making a ramdisk bigger then 512MB

[patrickmailing]

Hello,

I need for my database a ramdisk of 12 GB my problem is that i cannot go 
bigger then 512 see logs.
Anyone exp. in this ?

thnx for the help in advance

512 MB:

bubbles:/ # mke2fs -vm0 /dev/ram0 524288
mke2fs 1.35 (28-Feb-2004)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
131072 inodes, 524288 blocks
0 blocks (0.00%) reserved for the super user
First data block=1
64 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
bubbles:/ # mount /dev/ram0 /ramdisk
bubbles:/ # df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2            152219220    684556 151534664   1% /
tmpfs                   512064         8    512056   1% /dev/shm
/dev/ram0               507748        13    507735   1% /ramdisk


516 MB:

bubbles:/ # mke2fs -vm0 /dev/ram0 530000
mke2fs 1.35 (28-Feb-2004)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
66400 inodes, 132500 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
5 block groups
32768 blocks per group, 32768 fragments per group
13280 inodes per group
Superblock backups stored on blocks:
        32768, 98304

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
bubbles:/ # mount /dev/ram0 /ramdisk
mount: wrong fs type, bad option, bad superblock on /dev/ram0,
       or too many mounted file systems