On Sun, Mar 11, 2007 at 06:51:53PM -0400, Ric Wheeler wrote:
During the recent IO/FS workshop, we spoke briefly about the coming
change to a 4k sector size for disks on linux. If I recall correctly,
the general feeling was that the impact was not significant since we
already do most file
Now, if this disk was copied byte per byte (/bin/dd) to a
4096-based disk, and Linux would start using a sector size of
4096, then I would suddenly have
The ATA drives I'm aware of report 512 byte sector size, do 512 byte
I/O's but use 4K physical sectors and to get sane performance except the
First generation of 1K sector drives will continue to use the same
512-byte ATA sector size you are familiar with. A single 512-byte write
will cause the drive to perform a read-modify-write cycle. This
configuration is physical 1K sector, logical 512b sector.
The problem case is
Alan Cox wrote:
First generation of 1K sector drives will continue to use the same
512-byte ATA sector size you are familiar with. A single 512-byte write
will cause the drive to perform a read-modify-write cycle. This
configuration is physical 1K sector, logical 512b sector.
The problem
Alan Cox wrote:
First generation of 1K sector drives will continue to use the same
512-byte ATA sector size you are familiar with. A single 512-byte write
will cause the drive to perform a read-modify-write cycle. This
configuration is physical 1K sector, logical 512b sector.
The problem
Jan Engelhardt wrote:
On Mar 11 2007 18:51, Ric Wheeler wrote:
During the recent IO/FS workshop, we spoke briefly about the
coming change to a 4k sector size for disks on linux. If I
recall correctly, the general feeling was that the impact was
not significant since we already do most file
On Mon, 2007-03-12 at 08:18 +, Christoph Hellwig wrote:
The FS stack and higher levels of the I/O stack should be mostly ready.
The S/390 DASDs are commonly used with 4k sector sizes, and we've had
the occasional 2k sector SCSI MO device aswell. It would be nice to
get samples of large
Jan Engelhardt wrote:
On Mar 11 2007 22:45, Ric Wheeler wrote:
Jan Engelhardt wrote:
On Mar 11 2007 18:51, Ric Wheeler wrote:
During the recent IO/FS workshop, we spoke briefly about the
coming change to a 4k sector size for disks on linux. If I
recall correctly, the general feeling was that
For 1K/4K logical sector sizes, who knows. EFI? grins and runs
Certainly seems incompatible with the current popular DOS partition format.
Its a bit messier than that. There are two interpretations of DOS
partition formats found on 2K sector size magneto opticals. One is that
everything is
On Mon, Mar 12, 2007 at 10:45:16AM -0400, Jeff Garzik wrote:
Christoph Hellwig wrote:
the occasional 2k sector SCSI MO device aswell. It would be nice to
get samples of large sector size ATA devices into the hands of developers
to do real world testing of the whole stack.
hands of
Ric Wheeler wrote:
Alan Cox wrote:
First generation of 1K sector drives will continue to use the same
512-byte ATA sector size you are familiar with. A single 512-byte
write will cause the drive to perform a read-modify-write cycle.
This configuration is physical 1K sector, logical 512b
Doug == Douglas Gilbert [EMAIL PROTECTED] writes:
Doug SAT is now a standard and an agenda item for SAT-2 is to wire
Doug ATA8-ACS's large sector size support to the additions to SBC-3
Doug mentioned above.
Doug I'm not sure how this stuff plays with end to end data
Doug protection :-)
The
DOS partitions start partitions on odd-numbered sectors
I don't get this. If you mean partitions defined by the classic DOS
partition table format, then AFAICS, such a partition can start in any
sector.
so presuming you have odd-aligned disks, life is good.
What is an odd-aligned disk?
-
To
Hello.
Bryan Henderson wrote:
DOS partitions start partitions on odd-numbered sectors
I don't get this. If you mean partitions defined by the classic DOS
partition table format, then AFAICS, such a partition can start in any
sector.
Only at logical cylinder boudary (except for the
Bryan Henderson wrote:
DOS partitions start partitions on odd-numbered sectors
I don't get this. If you mean partitions defined by the classic DOS
partition table format, then AFAICS, such a partition can start in any
sector.
Bryan,
Typically the first partition on a DOS partitioned disk
On Mar 12, 2007 10:26 -0400, Jeff Garzik wrote:
In my own experiments on my own Fedora workstation, ~66% of IOs in Linux
start on an odd sector, and ~33% started on even-numbered sectors. For
a 1K-sector drive with 'odd' alignment, the configuration Microsoft will
likely want, that means
On Tue, Mar 13, 2007 at 01:11:44AM -0400, Andreas Dilger wrote:
I'd guess a vast majority of IO will have the end similarly
misaligned as the start. Very little filesystem IO is 512 bytes,
possibly excluding XFS in an unusual mode.
XFS (mkfs.xfs) can be told what the native sector size is
During the recent IO/FS workshop, we spoke briefly about the coming
change to a 4k sector size for disks on linux. If I recall correctly,
the general feeling was that the impact was not significant since we
already do most file system IO in 4k page sizes and should be fine as
long as we
Are there other concerns in the IO or FS stack that we should bring up
with vendors? I have been asked to summarize the impact of 4k sectors
on linux for a disk vendor gathering and want to make sure that I put
all of our linux specific items into that summary...
We need to make sure the
On Mar 11 2007 18:51, Ric Wheeler wrote:
During the recent IO/FS workshop, we spoke briefly about the
coming change to a 4k sector size for disks on linux. If I
recall correctly, the general feeling was that the impact was
not significant since we already do most file system IO in 4k
page
On Mar 11 2007 22:45, Ric Wheeler wrote:
Jan Engelhardt wrote:
On Mar 11 2007 18:51, Ric Wheeler wrote:
During the recent IO/FS workshop, we spoke briefly about the
coming change to a 4k sector size for disks on linux. If I
recall correctly, the general feeling was that the impact was
On Mar 12, 2007 04:27 +0100, Jan Engelhardt wrote:
Assume this partition table on my current HD:
Disk /dev/hdc: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Start End
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