Hi,
Following patches will fix 2 problems:
- 'lvcreate --alloc anywhere' cannot allocates log
on the same PV with mimage. This prevents us to create a mirror LV
on a VG with 2 PVs.
- 'lvconvert' from corelog allocates log from the same PV
with other image. It spoils redundancy.
(See attached metadata for examples)
This patch does the following changes:
(1/2) fix-mirror-alloc-anywhere.patch
- split log specific parts from _find_parallel_space() and
_alloc_parallel_area()
- determine log PV before doing other allocation
- use constraints correctly
* log allocation should avoid all PVs used by other parts of the LV
* other allocation should avoid log PV and parallel PVs of
corresponding lv segment (unchanged)
(2/2) fix-lvconvert-allocate-disklog.patch
- lvconvert to setup constraints properly
The 2nd patch itself is trivial and depends on the 1st patch for
the allocation logic to work correctly.
The patch has no effects on non-mirror allocation.
The patch was tested on the combinations of following scenarios:
- normal or anywhere allocation policy
- creation, corelog to disklog conversion, or linear to mirror conversion
- VG with 2 PVs or more than 2 PVs
Thanks,
--
Jun'ichi Nomura, NEC Corporation of America
# Generated by LVM2: Fri Sep 15 01:52:07 2006
contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'lvconvert -m 1 testvg0/lv0'"
creation_host = "tetsuo.lab" # Linux tetsuo.lab 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686
creation_time = 1158299527 # Fri Sep 15 01:52:07 2006
testvg0 {
id = "a5E2Nr-71Z7-YhaJ-PPto-QJaO-UwVR-Xux2tO"
seqno = 2
status = ["RESIZEABLE", "READ", "WRITE"]
extent_size = 8192 # 4 Megabytes
max_lv = 0
max_pv = 0
physical_volumes {
pv0 {
id = "1W9Pf5-JK1B-1zdo-qayI-lIch-4rPc-Dr6X8J"
device = "/dev/dm-0" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 4 # 16 Megabytes
}
pv1 {
id = "hMbR7i-RqtC-PpKK-2iZD-CMnX-yytR-S2mrH6"
device = "/dev/dm-1" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 4 # 16 Megabytes
}
pv2 {
id = "guSc2r-Tw4k-akM5-tjZ5-6V9m-hwCB-faY10J"
device = "/dev/dm-2" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 4 # 16 Megabytes
}
}
logical_volumes {
lv0 {
id = "y13S23-cGCp-NcJU-45vy-yQuz-v231-lNkFi1"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 1 # 4 Megabytes
type = "mirror"
mirror_count = 2
region_size = 1024
mirrors = [
"lv0_mimage_0", 0,
"lv0_mimage_1", 0
]
}
}
lv0_mimage_0 {
id = "vi2BZp-1W9W-T42S-AX6w-kIqC-bMtn-bOtxdQ"
status = ["READ", "WRITE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 1 # 4 Megabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 0
]
}
}
lv0_mimage_1 {
id = "G0SqFV-YW3K-C33U-zl2I-PvG8-QGus-i0ivzn"
status = ["READ", "WRITE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 1 # 4 Megabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv1", 0
]
}
}
}
}
# Generated by LVM2: Fri Sep 15 01:53:14 2006
contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'lvcreate -l1 -m1 -n lv0 testvg0'"
creation_host = "tetsuo.lab" # Linux tetsuo.lab 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686
creation_time = 1158299594 # Fri Sep 15 01:53:14 2006
testvg0 {
id = "UxVVG5-H6xQ-VSBn-2RLF-xKKX-R0e6-XIRZ7j"
seqno = 1
status = ["RESIZEABLE", "READ", "WRITE"]
extent_size = 8192 # 4 Megabytes
max_lv = 0
max_pv = 0
physical_volumes {
pv0 {
id = "b3vmJK-Ez6R-ZemQ-7IMp-Xid3-PXXu-pqzIEc"
device = "/dev/dm-0" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 4 # 16 Megabytes
}
pv1 {
id = "UkeYvg-AR5E-soSC-PImG-upyk-O11S-fkfANu"
device = "/dev/dm-1" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 4 # 16 Megabytes
}
}
}
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