Ahh, that clarifies some things. UFS2 can handle 2^64, but disklabel, newfs might not be able to yet. Not entirely sure where things are still 32-bit, I do know that when I tried to create a 2.2TB file system with the standard freebsd tools it didn't work.
Ben. On 4/14/05, Edgar Martinez <[EMAIL PROTECTED]> wrote: > > > > Benson….GREAT RESPONSE!! I Don't think I could have done any better myself. > Although I knew most of the information you provided, it was good to know > that my knowledge was not very far off. It's also reassuring that I'm not > the only nut job building ludicrous systems.. > > > > Nick, I believe that we may have some minor misinformation on our hands…. > > > > I refer you both to > http://www.freebsd.org/projects/bigdisk/ which according to > the page… > > > > When the UFS filesystem was introduced to BSD in 1982, its use of 32 bit > offsets and counters to address the storage was considered to be ahead of > its time. Since most fixed-disk storage devices use 512 byte sectors, 32 > bits allowed for 2 Terabytes of storage. That was an almost un-imaginable > quantity for the time. But now that 250 and 400 Gigabyte disks are available > at consumer prices, it's trivial to build a hardware or software based > storage array that can exceed 2TB for a few thousand dollars. > > The UFS2 filesystem was introduced in 2003 as a replacement to the original > UFS and provides 64 bit counters and offsets. This allows for files and > filesystems to grow to 2^73 bytes (2^64 * 512) in size and hopefully be > sufficient for quite a long time. UFS2 largely solved the storage size > limits imposed by the filesystem. Unfortunately, many tools and storage > mechanisms still use or assume 32 bit values, often keeping FreeBSD limited > to 2TB. > > So theoretically it should go over 1000TB…I've conducted several bastardized > installations due to sysinstall not being able to do anything over the 2TB > limit by creating the partition ahead of time…I am going to be attacking > this tonight and my efforts will be primarily focused on creating one large > 5.8TB slice….wish me luck!! > > > > PS: Muhaa haa haa! > > > > > > ________________________________ > > > From: Nick Pavlica [mailto:[EMAIL PROTECTED] > Sent: Thursday, April 14, 2005 2:49 PM > To: Benson Wong > Cc: [EMAIL PROTECTED]; freebsd-questions@freebsd.org > Subject: Re: 5.8TB RAID5 SATA Array Questions > > > > > > Is there any limitations that would prevent a single volume that large? > (if > > I remember there is a 2TB limit or something) > 2TB is the largest for UFS2. 1TB is the largest for UFS1. > > Is the 2TB limit that you mention only for x86? This file system > comparison lists the maximum size to be much larger > (http://en.wikipedia.org/wiki/Comparison_of_file_systems). > > --Nick -- blog: http://benzo.tummytoons.com site: http://www.thephpwtf.com
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