motr_sal: [CORTX-32689] Fix multipart download issue

[DPG17]

Problem:
After DI changes, the unit size is limited to 1MB for objects >= 1MB.
In SNS 3+2 config, the first part object for a 10MB object is partially
uploaded, causing EIO (-5) error during Get obj API call.

Solution:
Use part object size to calculate optimal block size.

Signed-off-by: Dattaprasad Govekar dattaprasad.govekar@seagate.com

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
  • Doc update (no ticket needed)
  • Code cleanup (no ticket needed)
• Component impact
  • Affects Dashboard, opened tracker ticket
  • Affects Orchestrator, opened tracker ticket
  • No impact that needs to be tracked
• Documentation (select at least one)
  • Updates relevant documentation
  • No doc update is appropriate
• Tests (select at least one)
  • Includes unit test(s)
  • Includes integration test(s)
  • Includes bug reproducer
  • No tests

Show available Jenkins commands

• jenkins retest this please
• jenkins test classic perf
• jenkins test crimson perf
• jenkins test signed
• jenkins test make check
• jenkins test make check arm64
• jenkins test submodules
• jenkins test dashboard
• jenkins test dashboard cephadm
• jenkins test api
• jenkins test docs
• jenkins render docs
• jenkins test ceph-volume all
• jenkins test ceph-volume tox

[sjain09]

looks good to me.

[sachinpunadikar]

LGTM

[sachinpunadikar]

retest this please