[LU-6226] lu-822 have a bad hash function for a switching files

• Type: Improvement
• Resolution: Unresolved
• Priority: Critical
• Severity: 3
• Assignee: WC Triage
• Reporter: Alexey Lyashkov

Description

after running sanity.sh i see very bad distribution for a fid's between OI files.

[root@rhel6-64 tmp]# debugfs -R 'ls -l' lustre-mdt1 | grep oi.16 | grep -v 8192
debugfs 1.42.7.wc1 (12-Apr-2013)
22 100644 (1) 0 0 876544 9-Feb-2015 21:11 oi.16.0
39 100644 (1) 0 0 491520 9-Feb-2015 21:11 oi.16.17
70 100644 (1) 0 0 28672 9-Feb-2015 21:11 oi.16.48
71 100644 (1) 0 0 2424832 9-Feb-2015 21:11 oi.16.49
72 100644 (1) 0 0 483328 9-Feb-2015 21:11 oi.16.50
73 100644 (1) 0 0 389120 9-Feb-2015 21:11 oi.16.51

all other files 8k byte size - so likely unused.

I don't see any reason to have 64 OI files if 5 only used.

Please fix a hash function to have better distribution.

Issue Links

• is related to: LU-822 allow multiple Object Index files to be created