Messages in this thread |  | | | Subject | Re: VFS/ext2fs - large files on the Alpha (fails for 17GB+) | | Date | Thu, 20 Aug 1998 09:17:11 +0300 (EEST) | | From | Matti Aarnio <> |
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Alex Buell <alex.buell@tahallah.demon.co.uk> wrote: ... > Does that means we *can* have a disk partition (or a RAID system) with a > max. size of 70TB with ext2fs on Intel platforms with a block size of 8192 > bytes? If so, will that be enough to satisfy one's lust for ever expanding > disk space....
Umm... Propably not. While the theorethical block addressability goes up like (blksize/4)**3 function, the maximum offset encodable with blocks is different (non-exponential) function:
32-bits per block offset within FS, giving us 4G blocks maximum. blksize offset (blksize/4)^3 max size 1k 4 TB 16 GB 16 GB 2k 8 TB 256 GB 256 GB 4k 16 TB 4 TB 4 TB 8k 32 TB 64 TB 32 TB So, you can't have 70TB filesystem with EXT2 even if you had the hardware... (counting with 1024 byte kilos that is 64 TB)
Also I think that at Intel you are better off to limit yourself to 4k blocks as those match paging system page size, and using larger blocks than pagesize is rather difficult...
> Cheers, > Alex > -- > http://www.tahallah.demon.co.uk
/Matti Aarnio <matti.aarnio@sonera.fi>
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