* stripe definitions
@ 2011-02-22 20:05 Jim Rees
2011-02-23 4:46 ` Boaz Harrosh
0 siblings, 1 reply; 2+ messages in thread
From: Jim Rees @ 2011-02-22 20:05 UTC (permalink / raw)
To: linux-nfs; +Cc: peter honeyman
There's an inconsistency in rfc5663 that had me a bit confused:
/// struct pnfs_block_stripe_volume_info4 {
/// length4 bsv_stripe_unit; /* size of stripe in bytes */
The comment "size of stripe in bytes" fits the definition of "stripe width"
from rfc5661 section 13.2, but that's not what's meant here. The field
name, "stripe_unit", is correct.
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: stripe definitions
2011-02-22 20:05 stripe definitions Jim Rees
@ 2011-02-23 4:46 ` Boaz Harrosh
0 siblings, 0 replies; 2+ messages in thread
From: Boaz Harrosh @ 2011-02-23 4:46 UTC (permalink / raw)
To: Jim Rees; +Cc: linux-nfs, peter honeyman
On 02/22/2011 12:05 PM, Jim Rees wrote:
> There's an inconsistency in rfc5663 that had me a bit confused:
>
> /// struct pnfs_block_stripe_volume_info4 {
> /// length4 bsv_stripe_unit; /* size of stripe in bytes */
>
> The comment "size of stripe in bytes" fits the definition of "stripe width"
> from rfc5661 section 13.2, but that's not what's meant here. The field
> name, "stripe_unit", is correct.
> --
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You are right stripe_unit is the the bytes to write to a single
device before advancing to the next device. The comment is wrong
the "size of stripe in bytes" is stripe_unit * num_of_devices.
The same name used in the OSD and files layout and has the same
meaning.
Cheers
Boaz
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