How many disks does RedHatLinuxsupport?

[Natalia Watanabe]

I have an Integrity rx4640 server connected to an EVA4000 and every time that I add a disk in the EVA and I present it to the server it appears as /dev/sdX, where X is a letter. My question is: How many disks I can add in the RedHat Enterprise Linux AS? Does some operating system limit that prevents me to add more disks exist?

[GGA]

hello

Maximum filesystem size (Ext3)
ver. 2.1 ver.3 ver. 4
1TB 1TB 8TB

on hardisk there is no limit
regards
gga

[Natalia Watanabe]

Thank you for the answer. I would like to know how many disks can I add. For example if I have disks from "/dev/sda" to "/dev/sdz", in that case, Can I add more disks? How many disks can I add, instead of the filesystems size?
Is there some operating system parameter that limits the number of disks that can be mounted?

[Gopi Sekar]

I don't see any limit other than the device major and minor number limitation.

if you check the /dev/sdX file, it has major and minor numbers associated with it. You can have at 255 minor numbered devices (like sda1, sda2, to sda255).

Also the file system has limitation which, I believe, is defined in the kernel

Hope this helps,
Gopi

[Ivan Ferreira]

Once you reach /dev/sdz, you will get /dev/sdaa, /dev/sdab, etc. Then /dev/sdba /dev/sdbb, and so.

[Rick Garland]

As many disks as the EVA has.

[Steven E. Protter]

There are limits based on performance that will get you long before any theoretical limits will stop you. Too many disks on the daisy chain will flood your i/o channels.

Its true that the real limitation is the EVA, not the OS. The EVA presents LUN's logical disks to the OS. The number of disks in the LUN effects performance but does not count toward any limits.

SEP