Re: linking devices
You speak about Raid-0 - have a look at Software-RAID-HOWTO.
The limitation of 2gb per file is not true anymore with the kernel 2.4 (as
long as your libc6 has been compiled with the kernel 2.4 - the simplest is to
work on a Woody :-) )
Or if you work on a 64bit architecture you can have bigger files :
This mail went on this list a few weeks ago :
thanks ,
I have installed kernel 2.4.1
with the latest util-linux ,modutils and raidtool (arrrgg)
and finally I can write file >2Gb :-)
...now i must rebuild ls, mv etc.....
m.
On Tue, Feb 06, 2001 at 09:33:06AM -0800 or thereabouts, brian moore wrote:
> On Tue, Feb 06, 2001 at 12:06:16AM -0500, Fraser Campbell wrote:
> > Francis 'Dexter' Gois <fg@tiscali.be> writes:
> >
> > > Not sure, but i think your problem is not with the NFS but with the
ext2fs
> > > filesystem, which cannot handle files larger than 2gb.
> >
> > Yes, ext2's maximum file size is 1 byte less than 2 GB (2147483647 bytes.
>
> Bzzt. Wrong. This is a limit of 2.2 and earlier kernels on 32 bit
> hardware. It has -NOTHING- to do with the file system per se: you will
> see exactly the same situation on Reiserfs, NFS (exported from a 64 bit
> machine even!), and every other file system.
>
> Why? Try 'man lseek' and note that the size of off_t, which is a 32 bit
> number on 32 bit platforms. There are lots and lots of library and system
> calls that expect or return something of type off_t, which can not exceed
> 32 bits on a 32 bit machine without some hackery. (See google for the
> 'large filesystem summit' for how ugly that hackery is.)
>
> The exact same file systems -do- support huge files on 64 bit machines.
> Why? Again, off_t is a 64 bit number on a 64 bit machine.
>
> > If the remote filesystem is ext2 then this is definitely the problem.
The
> > 2.4 kernel gets around this problem at least with some filesystems
(perhaps
> > still not with ext2 though) ... if you really need to create files > 2GB
then
> > you should upgrade your kernel. I've been running woody with 2.4 kernels
> > (test and "stable") for months without any problems, YMMV.
>
> Doesn't matter -what- the remote file system type is.
>
> Neither NFS nor glibc supports large files on 2.2 kernels. Period. Not
> with e2fs, not with nfs, not with anything.
>
> If you need files >=2G, you need a newer kernel or a 64 bit machine.
On Tuesday 13 February 2001 11:06, Mark Janssen wrote:
> On Tue, Feb 13, 2001 at 11:02:06AM +0000, Kozman Balint wrote:
> > Hi,
> >
> > is there any way to link two (or more) block devices (ex: two hard disks)
> > into one logical block device? I need this to be able to copy a file of
> > 70Gb to a machine which has two disks of 40 Gb.
>
> Yes.. You should be able to use the 'md' driver/subsystem to create a big
> virtual drive across multiple drives.
> There is only one problem... a 70 Gig file won't fit... since there is a
> filesize limitation (I think 2GB) So you'd have to split up the file in 2GB
> parts anyway, and then it's useless to go the hard way with md or lvm
>
> Mark Janssen Unix Consultant @ SyConOS IT
> E-mail: mark@markjanssen.homeip.net GnuPG Key Id: 357D2178
> http: markjanssen.homeip.net and markjanssen.[com|net|org|nl]
> Fax/VoiceMail: +31 20 8757555 Finger for GPG and GeekCode
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