[LU-19495] suboptimal object placement in lfs mirror extend

• Type: Bug
• Resolution: Duplicate
• Priority: Medium
• Severity: 3
• Assignee: WC Triage
• Reporter: Alex Zhuravlev

Description

I just noticed that sometimes lfs mirror extend -N creates new objects on used OSTs:

# lfs setstripe -c2 $tf
# lfs mirror extend -N $tf
# lfs getstripe -v $tf | grep l_ost_idx
      -   0: { l_ost_idx:   0, l_fid: [0x240000400:0x2:0x0] }
      -   1: { l_ost_idx:   1, l_fid: [0x280000400:0x2:0x0] }
      -   0: { l_ost_idx:   3, l_fid: [0x300000400:0x3:0x0] }
      -   1: { l_ost_idx:   0, l_fid: [0x240000400:0x3:0x0] }

all OSTs are fresh, just formatted

Issue Links

• duplicates: LU-15834 FLR: "lfs mirror extend" should take current OSTs into account
• duplicates: LU-19066 FLR2: identify rack/PSU failure domains for servers