Feasability of VERY large ext3 file system?

jason andrade jason at dstc.edu.au
Wed Dec 4 06:58:00 CST 2002


On Wed, 4 Dec 2002, Hubbard, David wrote:

> I have what is supposed to be a 600 GB-usable disk provided
> by a 3ware controller and (6) 120 GB IDE drives in a raid 5
> config.  Some of the more interesting things are 2.4.18-10
> reporting this on boot:

i hope you are not expecting that 6*120 gives you 5*120G
worth of disk space - unless you are planning on using a
RAW partition as opposed to this "filesystem" stuff.

> SCSI device sda: 1171864320 512-byte hdwr sectors (-499516 MB)

that's interesting.. have you considered upgrading to 2.4.18-18.7.x?

> /dev/sda1            572680832 122499596 421090736  23% /
>
> I have a 512 MB swap volume so I have not yet figured out
> where my other 37671288 kb (35 GB) out of a total of what
> should be 614400000 kb has gone.  I just did this last week

disk vendors and (usually) disk controller vendors all speak
with bytes = 1000.

operating systems speak with bytes = 1024

> and have opened a ticket with 3ware on it.  Their controller
> shows what it reports to be a 600 GB drive, so I was wanting
> my 600 GB from linux too.

600000000/1024/1024
572

> If this is all ext3 that would explain it, but I hadn't
> even thought of that...

you will also lose a certain amount to formatting, yes.

> If you hear anything let me know, I'm interested too as I have
> six more available channels on this 3ware and was thinking
> about growing it to 1.2 TB once I figure out where my missing
> 37 GB has gone.  It's nice being able to add 600 GB for $1000
> using IDE drives. :-)

also, did you tunefs -m 1 /dev/sda1

and then reboot, or remount, just to make sure ?

regards,

-jason




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