[LU-12924] scale precreate_batch for larger OSTs

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Labels: performance scalability
• Assignee: WC Triage
• Reporter: Andreas Dilger

Description

Using large capacity OST targets, we frequently increase obdfilter.*.precreate_batch since this appears to improve mdtest benchmark results.

Currently the obdfilter.*.precreate_batch values scale somewhat for small capacity OST targets; from 8 (<=1GB OST) to 128 (larger OSTs). However max value of 128 has not changed in several years. mdest benchmarks suggest larger capacity OST targets (e.g. 512T) would benefit from a precreate_batch value of 256 or larger.