Messages in this thread |  | | From | "Albert D. Cahalan" <> | Subject | Re: BIG files & file systems | Date | Mon, 5 Aug 2002 13:31:19 -0400 (EDT) |
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Randy.Dunlap writes: > On Mon, 5 Aug 2002, Randy.Dunlap wrote:
>> Albert, your graph shows that the triple-indirect limit is >> at 8 EB, right?
No, that's the API limit. We use signed 64-bit byte offsets in our API. (it's just under 8 EiB, which is about 9.2 EB)
I do see one flaw on my graph. That horizontal line at 1 TiB ought to be at 2 TiB apparently. It's for the kernel limit, perhaps only on 32-bit hardware. This changes the limit with 4096-byte blocks from 1 TiB to 2 TiB, so the filesystem's 4.4 TB is still out of reach.
> Yes, but your text (email) explanation puts it at around > 4.4 TB. Got it.
If we had quadruple indirection, then we'd hit a 17.6 TB limit (16 TiB) due to the 32-bit block numbers. With an 8192-byte block size, we'd hit the block number limit at 35 TB (32 TiB) before hitting the triple-indirection limit. Of course none of this gets you past the kernel limit at around 2.2 TB.
I believe we allow 8192-byte blocks on the Alpha. You might want to look into that. IA-64 maybe too.
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