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04-10-2013 08:10 AM
04-10-2013 08:10 AM
slow performance on logical volumes
its a SUSE 11 SP2 xen virtual machine with 8 GB Memory, kernel version 3.0.58-0.6.6-xen #1 SMP
we recently changed the traditional/static partitioning(/dev/xvdc{1,2,3} to lvm based volumes, and after that we are observing serious performance issues. e.g earlier(when we were using static/traditional partitioning) backup took only 45 minutes, now backup takes 2 hours or more. Also our end users are complaining about performance too.
following are storage details:
df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/xvda3 ext3 47G 7.6G 38G 17% /
devtmpfs devtmpfs 4.1G 140K 4.1G 1% /dev
tmpfs tmpfs 8.0G 179M 7.9G 3% /dev/shm
/dev/xvda1 ext3 243M 24M 207M 11% /boot
/dev/mapper/VG--ORG--ORACLE-sap--oracle ext3 245G 222G 11G 96% /oracle
/dev/mapper/VG--ORG--ORACLE-sap--ora--sapmnt ext3 15G 1.7G 13G 12% /sapmnt
/dev/mapper/VG--ORG--ORACLE-sap--ora--usrsap ext3 30G 24G 4.3G 85% /usr/sap
# pvscan
PV /dev/xvdc VG VG-ORG-ORACLE lvm2 [350.00 GiB / 7.00 GiB free]
# vgscan
Reading all physical volumes. This may take a while...
Found volume group "VG-ORG-ORACLE" using metadata type lvm2
# /sbin/lvs
sap-ora-sapmnt VG-ORG-ORACLE -wi-ao 15.00g
sap-ora-usrsap VG-ORG-ORACLE -wi-ao 30.00g
sap-oracle VG-ORG-ORACLE -wi-ao 248.00g
running "hdparm -t" on the raw disk /dev/xvdc returns far better results then running "hdparm -t" on logical volumes
/dev/xvdc:
Timing buffered disk reads: 742 MB in 3.00 seconds = 247.31 MB/sec
/dev/xvdc:
Timing buffered disk reads: 670 MB in 3.00 seconds = 223.31 MB/sec
/dev/xvdc:
Timing buffered disk reads: 718 MB in 3.00 seconds = 239.23 MB/sec
[/code]
while running "hdparm -t" on logical volume returns very slow results:
/dev/mapper/VG--ORG--ORACLE-sap--oracle:
Timing buffered disk reads: 148 MB in 3.01 seconds = 49.17 MB/sec
/dev/mapper/VG--ORG--ORACLE-sap--oracle:
Timing buffered disk reads: 192 MB in 3.10 seconds = 62.02 MB/sec
/dev/mapper/VG--ORG--ORACLE-sap--oracle:
Timing buffered disk reads: 154 MB in 3.03 seconds = 50.87 MB/sec
/dev/mapper/VG--ORG--ORACLE-sap--oracle:
Timing buffered disk reads: 184 MB in 3.03 seconds = 60.77 MB/sec
Please help and suggest
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04-10-2013 08:16 AM
04-10-2013 08:16 AM
Re: slow performance on logical volumes
also for your kind information
pvdisplay
--- Physical volume ---
PV Name /dev/xvdc
VG Name VG-ORG-ORACLE
PV Size 350.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 89599
Free PE 1791
Allocated PE 87808
PV UUID jhypNN-fPpy-2uzc-nsxP-qZIl-9JAg-O9aenE
vgdisplay
--- Volume group ---
VG Name VG-ORG-ORACLE
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 1
Act PV 1
VG Size 350.00 GiB
PE Size 4.00 MiB
Total PE 89599
Alloc PE / Size 87808 / 343.00 GiB
Free PE / Size 1791 / 7.00 GiB
VG UUID MSnb2T-A5Pf-3i7B-5sz2-f10M-2T2s-uCbdJn
lvdisplay
--- Logical volume ---
LV Name /dev/VG-ORG-ORACLE/sap-ora-sapmnt
VG Name VG-ORG-ORACLE
LV UUID mSM4Mg-jxoV-phr5-8p5S-i5XY-VSbN-p6McFk
LV Write Access read/write
LV Status available
# open 1
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1024
Block device 253:0
--- Logical volume ---
LV Name /dev/VG-ORG-ORACLE/sap-ora-usrsap
VG Name VG-ORG-ORACLE
LV UUID zbwf4e-E3HL-6Vnw-ayXK-19PH-Dtir-uqi52g
LV Write Access read/write
LV Status available
# open 1
LV Size 30.00 GiB
Current LE 7680
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1024
Block device 253:1
--- Logical volume ---
LV Name /dev/VG-ORG-ORACLE/sap-oracle
VG Name VG-ORG-ORACLE
LV UUID 4zt2BF-BhIJ-a4I7-mr9i-KVBk-c6Dt-BvztDQ
LV Write Access read/write
LV Status available
# open 1
LV Size 248.00 GiB
Current LE 63488
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
--- Logical volume ---
LV Name /dev/VG-ORG-ORACLE/oracle-sap-backup
VG Name VG-ORG-ORACLE
LV UUID vXL33N-CaUY-ILsT-YwqE-Hn0Z-xLRV-Pm2aRS
LV Write Access read/write
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1024
Block device 253:3
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04-10-2013 12:58 PM
04-10-2013 12:58 PM
Re: slow performance on logical volumes
I think I have found the solution.
our XEN hypervisor(dom0) is using LVM, and we are also using lvm on our virtual machines(domU).. which is not recommend
as per https://www.suse.com/support/kb/doc.php?id=3559698
Only use Logical Volume Manager (LVM) on Dom0 or DomU, but not both
Regards