malahal@xxxxxxxxxx wrote:
> This patch adds '--mirroredlog' option to LVM commands to create a
> mirror with mirrored log device. Rebased to the latest LVM code
> (LVM2.2.02.43). Appreciate any comments.
Hi, Malahal
This is the additional test results of mirrored log. Currently your
patch is proposed by "RFC", and these might be known issues to you,
but I hope this reports would be helpful to improve your patch.
Any comments are welcome.
0. Test environment
- LVM2.2.02.43 with mirrored log patch
- vg00 is composed of 8 PVs (/dev/sd[c-j])
1. SIGSEGV at converting a core log to a mirrored log
# dmsetup status
vg00-lv00_mimage_1: 0 24576 linear
vg00-lv00_mimage_0: 0 24576 linear
vg00-lv00: 0 24576 mirror 2 253:3 253:4 24/24 1 AA 1 core
# lvconvert -m1 --mirroredlog /dev/vg00/lv00
Segmentation fault
# lvconvert -m2 --mirroredlog /dev/vg00/lv00
Segmentation fault
2. Fail at conversion from 2 legs to 3 legs
lv00 in vg00 has 2 legs (2 log legs and 2 data legs), and when it is
converted to the structure with 3 lets, the conversion fails.
vg00-lv00 (253:5)
+ vg00-lv00_mimage_1 (253:4)
+ vg00-lv00_mimage_0 (253:3)
+ vg00-lv00_mlog (253:2)
+ vg00-lv00_mlog_mimage_1 (253:1)
+ vg00-lv00_mlog_mimage_0 (253:0)
# lvconvert -m2 --mirroredlog /dev/vg00/lv00
device-mapper: reload ioctl failed: No such device or address
Failed to lock lv00
# dmsetup status
vg00-lv00_mimage_2: 0 8192 linear <-- data leg is created
vg00-lv00_mimage_1: 0 24576 linear
vg00-lv00_mlog_mimage_1: 0 8192 linear
vg00-lv00_mimage_0: 0 24576 linear
vg00-lv00_mlog_mimage_0: 0 8192 linear
vg00-lv00_mimagetmp_2: 0 24576 error <-- temporary data log exists
vg00-lv00_mlog: 0 8192 mirror 2 253:1 253:2 8/8 1 AA 1 core
vg00-lv00: 0 24576 mirror 2 253:4 253:5 24/24 1 AA 3 disk 253:3 A
3. Fail at conversion from disk log to mirrored log
# dmsetup status
vg00-lv00_mimage_1: 0 24576 linear
vg00-lv00_mimage_0: 0 24576 linear
vg00-lv00_mlog: 0 8192 linear
vg00-lv00: 0 24576 mirror 2 253:1 253:2 24/24 1 AA 3 disk 253:0 A
# lvconvert -m1 --mirroredlog /dev/vg00/lv00
Logical volume lv00 already has 1 mirror(s).
=> disk log should be converted to mirrored log?
# lvconvert -m2 --mirroredlog /dev/vg00/lv00
device-mapper: reload ioctl failed: No such device or address
Failed to lock lv00
# dmsetup status
vg00-lv00_mimage_2: 0 8192 linear
vg00-lv00_mimage_1: 0 24576 linear
vg00-lv00_mimage_0: 0 24576 linear
vg00-lv00_mimagetmp_2: 0 24576 error
vg00-lv00_mlog: 0 8192 linear
vg00-lv00: 0 24576 mirror 2 253:1 253:2 24/24 1 AA 3 disk 253:0 A
=> disk log should be converted to mirrored log with 3 legs?
Thanks,
---
Takahiro Yasui
Hitachi Computer Products (America), Inc.
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