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Using loopback devices in RAID?

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Special Forums Hardware Filesystems, Disks and Memory Using loopback devices in RAID?
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Old 04-16-2003
Question Using loopback devices in RAID?
Hopefully I am posting this silly question in the right place...

I was wondering about the possibility of using loopback files on a physical disk to create virtual disks that could shrink or grow as needed. Something like RAID 0, but instead of using block devices, just using files. If I need more space, I just add another loopback file to the pool. If I don't need it anymore, I just remove it. But doing either of these things doesn't damage the data. Does anyone know if this is possible?

Similarly, I was also wondering is it's possible to mount multiple NFS or Samba shares to one location and have them all appear as a single "mounted device". For instance, if I want to mount th C$ share on an NT box and 10.0.1.1:/home on /mnt/files. Is there a way to do this?

Thanks.
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LEARN ABOUT NETBSD

ataraid

ATARAID(4)						   BSD Kernel Interfaces Manual 						ATARAID(4)

NAME

     ataraid -- software BIOS RAID

SYNOPSIS

     pseudo-device ataraid
     ld* at ataraid? vendtype ? unit ?

DESCRIPTION

     The ataraid driver provides support for BIOS-based software RAID controllers.  These are devices which have some simple support for several
     basic RAID levels (often RAID 0 and RAID 1), but which require software support to actually perform the RAID function.  The BIOS support is
     largely just to create and recognize the array so that it may be a boot device.

     The driver currently supports RAID formats from:
	   o   Adaptec HostRAID (found in Intel 6300ESB)
	   o   Intel MatrixRAID
	   o   JMicron RAID
	   o   nVidia MediaShield
	   o   Promise FastTrak
	   o   Via V-RAID (found in many VIA-based motherboards)

     Status of the logical disk as well as the disks associated with it, can be viewed through the bioctl(8) utility.

SEE ALSO

     ld(4), bioctl(8)

HISTORY

     The ataraid driver first appeared in NetBSD 2.0.

AUTHORS

     The ataraid driver was originally adapted from FreeBSD by Jason Thorpe <thorpej@NetBSD.org>.

BUGS

     Not all features of the software RAID are currently recognized or supported.  For example, the Adaptec support doesn't recognize when a RAID
     1 should be in a ``building'' state, and it does not do the right thing.

     At least part of the reason for this is that the publically-available information on these formats is quite limited.

BSD
								September 16, 2008							       BSD