ext3 4TB fs limit on amd64 (FAQ?)
Ralf Gross
Ralf-Lists at ralfgross.de
Tue Nov 28 09:05:48 UTC 2006
Christian Kujau said:
> On Sun, 26 Nov 2006, Ralf Gross wrote:
>> I've a question about the max. ext3 FS size. The ext3 FAQ explains that
>> the limit is 4TB.
>
> Hm, strange: I'm pretty sure that mkfs.ext3 understands bigger
> blocksizes for quite a while now. Then again, the FAQ says
> "Version: 2004-10-14"...
>
> So, although I'd really love to have this information (and the FAQ!) on
> http://e2fsprogs.sf.net/ this is what I found:
>
> blocksize file size limit filesystem size limit
> 1 KiB 16448 MiB (~ 16 GiB) 2048 GiB (= 2 TiB)
> 2 KiB 256 GiB 8192 GiB (= 8 TiB)
> 4 KiB 2048 GiB (= 2 TiB) 16384 GiB (= 16 TiB)
> 8 KiB 65568 GiB (~ 64 TiB) 32768 GiB (= 32 TiB)
>
> Note that an 8 KiB blocksize is only supported on systems with 8 KiB
> pagesize (i.e. linux/alpha).
>
> So, it really looks like 16TiB shouldn't be a problem...but I just
> stumbled over this:
> https://www.redhat.com/archives/ext3-users/2006-October/msg00000.html
Thus with 4 KiB blocksize and a < 8TiB fs I should be on the safe side.
> While the ext* gurus are busy on the ext4 list, I too would appreciate
> a comment on the current limitation of ext2/ext3/ext4, so that we can
> update the FAQ. These questions really come up way too often...
Yes, the FAQ is a bit misleading.
ralf
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