Brad bene...@yahoo.com writes:
Hi Adam,
I'm not Adam, but I'll take a stab at it anyway.
BTW, your crossposting is a bit confusing to follow, at least when using
gmane.org. I think it is better to stick to one mailing list anyway?
From your the picture, it looks like the data is distributed
On Jan 4, 2010, at 7:08 PM, Brad wrote:
Hi Adam,
From your the picture, it looks like the data is distributed evenly
(with the exception of parity) across each spindle then wrapping
around again (final 4K) - is this one single write operation or two?
| P | D00 | D01 | D02 | D03 | D04 |
If a 8K file system block is written on a 9 disk raidz vdev, how is the data
distributed (writtened) between all devices in the vdev since a zfs write is
one continuously IO operation?
Is it distributed evenly (1.125KB) per device?
--
This message posted from opensolaris.org
Hi Brad,
RAID-Z will carve up the 8K blocks into chunks at the granularity of the sector
size -- today 512 bytes but soon going to 4K. In this case a 9-disk RAID-Z vdev
will look like this:
| P | D00 | D01 | D02 | D03 | D04 | D05 | D06 | D07 |
| P | D08 | D09 | D10 | D11 | D12 | D13 | D14
Hi Adam,
From your the picture, it looks like the data is distributed evenly (with the
exception of parity) across each spindle then wrapping around again (final 4K)
- is this one single write operation or two?
| P | D00 | D01 | D02 | D03 | D04 | D05 | D06 | D07 | -one write
op??
