[linux-lvm] lvextend impact on io activity
Ming Zhang
mingz at ele.uri.edu
Fri Jul 22 21:51:57 UTC 2005
Hi folks
I read the code a bit while still can not understand this. Assume there
are some IO activity to a certain LV while the lvextend is underway, I
wonder how large this impact will be. And from code point of view,
during the extend, in which period, the io is blocked or held?
Thanks!
This is the lvextend activity. could anybody tell me where is the
blocked range?
#lvmcmdline.c:836 Processing: lvextend -vvvvvvvv -L
+1G /dev/vgtest/test
#lvmcmdline.c:839 O_DIRECT will be used
#config/config.c:773 Setting global/locking_type to 1
#config/config.c:758 Setting global/locking_dir to /var/lock/lvm
#locking/locking.c:139 File-based locking enabled.
#lvresize.c:519 Finding volume group vgtest
#locking/file_locking.c:164 Locking /var/lock/lvm/V_vgtest WB
#device/dev-io.c:425 Opened /dev/md0 RW O_DIRECT
#device/dev-io.c:134 /dev/md0: block size is 4096 bytes
#device/dev-io.c:204 <backtrace>
#label/label.c:135 /dev/md0: Failed to read label area
#label/label.c:194 /dev/md0: No label detected
#label/label.c:286 <backtrace>
#device/dev-io.c:425 Opened /dev/hda1 RW O_DIRECT
#device/dev-io.c:134 /dev/hda1: block size is 1024 bytes
#label/label.c:194 /dev/hda1: No label detected
#label/label.c:286 <backtrace>
#device/dev-io.c:425 Opened /dev/sda1 RW O_DIRECT
#device/dev-io.c:134 /dev/sda1: block size is 512 bytes
#label/label.c:173 /dev/sda1: lvm2 label detected
#cache/lvmcache.c:427 lvmcache: /dev/sda1 now orphaned
#cache/lvmcache.c:427 lvmcache: /dev/sda1 now in VG vgtest
#device/dev-io.c:425 Opened /dev/hda2 RW O_DIRECT
#device/dev-io.c:134 /dev/hda2: block size is 4096 bytes
#label/label.c:194 /dev/hda2: No label detected
#label/label.c:286 <backtrace>
#device/dev-io.c:425 Opened /dev/hda3 RW O_DIRECT
#device/dev-io.c:134 /dev/hda3: block size is 4096 bytes
#label/label.c:194 /dev/hda3: No label detected
#label/label.c:286 <backtrace>
#device/dev-io.c:425 Opened /dev/sdb1 RW O_DIRECT
#device/dev-io.c:134 /dev/sdb1: block size is 512 bytes
#label/label.c:173 /dev/sdb1: lvm2 label detected
#cache/lvmcache.c:427 lvmcache: /dev/sdb1 now orphaned
#cache/lvmcache.c:427 lvmcache: /dev/sdb1 now in VG vgtest
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1135)
from /dev/sda1 at 93184 size 978
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1135)
from /dev/sdb1 at 9216 size 978
#archiver.c:109 Archiving volume group "vgtest" metadata.
#metadata/pv_map.c:177 Allowing allocation on /dev/sda1 start PE
0 length 25
#metadata/pv_map.c:177 Allowing allocation on /dev/sda1 start PE
1305 length 3813
#metadata/pv_map.c:177 Allowing allocation on /dev/sdb1 start PE
0 length 1023
#metadata/pv_manip.c:231 /dev/sda1 0: 0 25: test
(1280:0)
#metadata/pv_manip.c:231 /dev/sda1 1: 25 1280: test(0:0)
#metadata/pv_manip.c:231 /dev/sda1 2: 1305 231: test
(1305:0)
#metadata/pv_manip.c:231 /dev/sda1 3: 1536 3582: NULL(0:0)
#metadata/pv_manip.c:231 /dev/sdb1 0: 0 1023: NULL(0:0)
#format_text/format-text.c:401 Writing vgtest metadata
to /dev/sda1 at 94208 len 1230
#format_text/format-text.c:401 Writing vgtest metadata
to /dev/sdb1 at 10240 len 1230
#format_text/format-text.c:487 Pre-Committing vgtest metadata
(1136) to /dev/sda1 header at 2048
#format_text/format-text.c:487 Pre-Committing vgtest metadata
(1136) to /dev/sdb1 header at 2048
#archiver.c:333 Creating volume group backup
"/etc/lvm/backup/vgtest"
#format_text/format-text.c:667 Writing vgtest metadata
to /etc/lvm/backup/.lvm_centos4.localdomain_3967_582226307
#format_text/format-text.c:711 Committing vgtest metadata (1136)
#format_text/format-text.c:712
Renaming /etc/lvm/backup/vgtest.tmp to /etc/lvm/backup/vgtest
#locking/file_locking.c:250 Locking LV
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB (W)
#metadata/metadata.c:1153 Finding volume group for uuid
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1135)
from /dev/sda1 at 93184 size 978
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1135)
from /dev/sdb1 at 9216 size 978
#metadata/metadata.c:1159 Found volume group "vgtest"
#config/config.c:758 Setting activation/missing_stripe_filler
to /dev/ioerror
#activate/dev_manager.c:1040 Getting device info for vgtest-test
#ioctl/libdm-iface.c:1326 dm version O
#ioctl/libdm-iface.c:1326 dm info
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB N
#mm/memlock.c:100 Locking memory
#mm/memlock.c:131 memlock_count inc to 1
#ioctl/libdm-iface.c:1326 dm names O
#activate/dev_manager.c:1877 Found existing layer 'vgtest-test'
#activate/dev_manager.c:1120 Getting device info for vgtest-test
#ioctl/libdm-iface.c:1326 dm info vgtest-test N
#activate/dev_manager.c:2125 Found active lv test
#activate/dev_manager.c:502 Suspending vgtest-test
#ioctl/libdm-iface.c:1326 dm suspend vgtest-test N
#format_text/format-text.c:487 Committing vgtest metadata (1136)
to /dev/sda1 header at 2048
#format_text/format-text.c:487 Committing vgtest metadata (1136)
to /dev/sdb1 header at 2048
#locking/file_locking.c:235 Unlocking LV
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB
#metadata/metadata.c:1153 Finding volume group for uuid
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1136)
from /dev/sda1 at 94208 size 1230
#label/label.c:173 /dev/sda1: lvm2 label detected
#label/label.c:173 /dev/sdb1: lvm2 label detected
#format_text/format-text.c:311 Read vgtest metadata (1136)
from /dev/sdb1 at 10240 size 1230
#metadata/metadata.c:1159 Found volume group "vgtest"
#activate/dev_manager.c:1040 Getting device info for vgtest-test
#ioctl/libdm-iface.c:1326 dm info
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB N
#ioctl/libdm-iface.c:1326 dm names O
#activate/dev_manager.c:1877 Found existing layer 'vgtest-test'
#activate/dev_manager.c:1120 Getting device info for vgtest-test
#ioctl/libdm-iface.c:1326 dm info vgtest-test N
#activate/dev_manager.c:2125 Found active lv test (suspended)
#activate/dev_manager.c:552 Loading vgtest-test
#activate/dev_manager.c:719 Adding target: 0 10485760
linear /dev/sda1 205184
#activate/dev_manager.c:719 Adding target: 10485760 204800
linear /dev/sda1 384
#activate/dev_manager.c:719 Adding target: 10690560 1892352
linear /dev/sda1 10690944
#ioctl/libdm-iface.c:1326 dm reload
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB N
#activate/dev_manager.c:634 Activated vgtest-test
CLvaUmVA006uC6Nr1pXXOad2nN1ldecty23Be3lof5n4v6CxFykmOs5Ndv5uC8NB 253:000
#activate/dev_manager.c:502 Resuming vgtest-test
#ioctl/libdm-iface.c:1326 dm resume vgtest-test N
#mm/memlock.c:119 Unlocking memory
#mm/memlock.c:138 memlock_count dec to 0
#activate/fs.c:169 Removing /dev/vgtest/test
#activate/fs.c:176 Linking /dev/vgtest/test -> /dev/mapper/vgtest-
test
#misc/selinux.c:25 Setting SELinux context for /dev/vgtest/test
#locking/file_locking.c:59 Unlocking /var/lock/lvm/V_vgtest
#device/dev-io.c:456 Closed /dev/md0
#device/dev-io.c:456 Closed /dev/hda1
#device/dev-io.c:456 Closed /dev/sda1
#device/dev-io.c:456 Closed /dev/hda2
#device/dev-io.c:456 Closed /dev/hda3
#device/dev-io.c:456 Closed /dev/sdb1
Extending logical volume test to 6.00 GB
Logical volume test successfully resized
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