Messages in this thread | | | Subject | Re: [RFC][PATCH 0/2]Extend ext3 filesystem limit from 8TB to 16TB | From | Mingming Cao <> | Date | Thu, 30 Mar 2006 11:16:42 -0800 |
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On Thu, 2006-03-30 at 10:40 -0700, Andreas Dilger wrote: > On Mar 29, 2006 17:38 -0800, Mingming Cao wrote: > > Have verified these two patches on a 64 bit machine with 10TB ext3 > > filesystem, fsx runs fine for a few hours. Also testes on 32 bit machine > > with <8TB ext3. > > Have you done tests _near_ 8TB with a 32-bit machine, even without these > patches? No I haven't. The >8TB right now is attached to a 64 bit machine, but we should able to move it to a 32 bit machine.
> In particular, filling up the filesystem to be close to full > so that we really depend on the > 2TB code to work properly?
I made a kernel patch to allow a file to specify which block group it wants it's blocks to allocate from(using ioctl to set the goal allocation block group). I set the goal block group falls to somewhere >8TB, and did dd tests on that file. Verified this with debugfs, the allocated block numbers are beyond 2**31.
Also before run fsx tests, created many directories (32768 at most:) and verified one directory's inode is located in block group >8TB space. So when we do fsx test on files under that directory, we are creating/testing files >8TB.
BTW, do you think this ioctl is useful in general for other users? I attached the patch here.
I also plan to hack the code of inode allocation to force all files's inode is put in the block group >8TB, so that we could do a full filesystem tests there.
> Also, in > theory with these patches even a 32-bit machine could run > 8TB, right? > > There have been sporadic reports of failure for large ext3 filesystems, > and some of them say that 32-bit systems fail and 64-bit systems work. > There is a kernel bugzilla bug open for this, but it was never really > identified what the source of the problem was. >
Sure, I will verify that on my 32 bit machine with >8TB.
> Cheers, Andreas > -- > Andreas Dilger > Principal Software Engineer > Cluster File Systems, Inc. >
Thanks,
Mingming
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