[Lustre-discuss] Clarification on DDN performance best practices

[Peter Grandi]

[ ... ]

>> Also, when creating LUNs on a DDN to be use exclusively for OSTs,
>> does in make sense to use a disk block size of 4K (instead of
>> 512bytes) since the standard block size for luster is also 4K.

> 4k blocks are also a good idea because the S2As prefer that IO be
> aligned on 4k boundries.

As to this, the tier are organized as something similar to 8+2 RAID6.
For 8-way data, which is the unit? Sectors? Blocks? In other words, what
is the stripe data size in KiB with a sector size of 512 vs. a sector
size of 4KiB?