On 02/22/2015 01:11 PM, Chris Murphy wrote:
On Sun, Feb 22, 2015 at 12:19 PM, jd1008 <jd1008@xxxxxxxxx> wrote:
I have a 2TB drive formatted as a single MBR partition.
I guess that's just about the limit of and MBR partition size.
But what if the sector size is made to be programmable
and is increased at formatting time to values like 2K bytes
or even 128K bytes, and then let the FS decide how to use
those sectors?
Physical and logical sector size is fixed by the drive (in firmware).
There's no changing it. I'm skeptical whether we'll ever see 4Kn (4096
byte logical and physical sector) drives being understood by (legacy)
BIOS computers. The BIOS asks the drive for LBA 0 and expects to get
512 bytes, yet with 4Kn drives, LBA 0 is 4096 bytes, so instantly you
have failure. Actually, it's possible the confusion even happens at
POST before BIOS asks the drive for the first sector.
As for fs block sizes, right now on Linux the block size can't be
larger than page size, which on x86 is 4096 bytes. Btrfs gets around
this somewhat with a 4KB blocksize, while defaulting to 16KB nodesize.
I'm not sure of the upper limit, I've tested 64KB nodesizes.
Interesting.
What about FreeBSD's UFS (sometimes aka FFS - fast fs)?
Does it not also allow for FS blocksize to be > than page size?
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