[CentOS] kswapd taking 100% cpu with no swap on system

[Ali Ahsan]

On 05/09/2011 11:06 PM, Lamar Owen wrote:
> Can you give the output of pvdisplay, vgdisplay, and lvdisplay?
>
> Also, did you align the pv's to 4K sectors when you partitioned?
>
> What does iostat -x tell you?
>
>

  pvdisplay
   --- Physical volume ---
   PV Name               /dev/sda2
   VG Name               VolGroup00
   PV Size               931.01 GB / not usable 13.34 MB
   Allocatable           yes (but full)
   PE Size (KByte)       32768
   Total PE              29792
   Free PE               0
   Allocated PE          29792
   PV UUID               eLxFxo-4jHx-RGBA-mAR2-7vnW-YAej-3vPphH

   --- Physical volume ---
   PV Name               /dev/sdb1
   VG Name               VolGroup00
   PV Size               931.51 GB / not usable 11.19 MB
   Allocatable           yes
   PE Size (KByte)       32768
   Total PE              29808
   Free PE               120
   Allocated PE          29688
   PV UUID               pMtvzy-je8m-uJfY-zEpS-M2Cd-ATW9-o9tfuM


vgdisplay
   --- Volume group ---
   VG Name               VolGroup00
   System ID
   Format                lvm2
   Metadata Areas        2
   Metadata Sequence No  6
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                3
   Open LV               3
   Max PV                0
   Cur PV                2
   Act PV                2
   VG Size               1.82 TB
   PE Size               32.00 MB
   Total PE              59600
   Alloc PE / Size       59480 / 1.82 TB
   Free  PE / Size       120 / 3.75 GB
   VG UUID               FNqyvW-LWqe-iuV4-1tRJ-Gsrl-sH1X-KyHLpz


--- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol01
   VG Name                VolGroup00
   LV UUID                Ekyo0u-UVOe-Sanz-9Eil-N7J5-vebi-KcRUW2
   LV Write Access        read/write
   LV Status              available
   # open                 1
   LV Size                30.00 GB
   Current LE             960
   Segments               1
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:0

   --- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol02
   VG Name                VolGroup00
   LV UUID                2I10tF-PgZP-zUSc-oQi4-am6h-18xv-FfLUJw
   LV Write Access        read/write
   LV Status              available
   # open                 1
   LV Size                1.79 TB
   Current LE             58512
   Segments               2
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:1

   --- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol03
   VG Name                VolGroup00
   LV UUID                o9SQVk-Ehee-0PS3-e0FC-mb0h-vXwG-wCGvbp
   LV Write Access        read/write
Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:0

   --- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol02
   VG Name                VolGroup00
   LV UUID                2I10tF-PgZP-zUSc-oQi4-am6h-18xv-FfLUJw
   LV Write Access        read/write
   LV Status              available
   # open                 1
   LV Size                1.79 TB
   Current LE             58512
   Segments               2
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:1

   --- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol03
   VG Name                VolGroup00
   LV UUID                o9SQVk-Ehee-0PS3-e0FC-mb0h-vXwG-wCGvbp
   LV Write Access        read/write
   LV Status              available
   # open                 1
   LV Size                256.00 MB
   Current LE             8
   Segments               1
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:2



[root at cassandra1 ~]# iostat -x
Linux 2.6.18-238.9.1.el5 (cassandra1.xxxxx.com)     05/09/2011

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
            5.33    0.01    1.00    3.88    0.00   89.78

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz 
avgqu-sz   await  svctm  %util
sda               0.03     4.57  0.02  0.79     5.05    42.88    
58.66     0.01    7.61   2.04   0.17
sda1              0.01     0.00  0.00  0.00     0.01     0.00    
20.89     0.00    2.89   2.84   0.00
sda2              0.02     4.57  0.02  0.79     5.04    42.88    
58.69     0.01    7.61   2.04   0.17
sdb               8.28   192.14 43.04  3.85  2855.18  1567.95    
94.34     2.22   47.25   4.74  22.22
sdb1              8.28   192.14 43.04  3.85  2855.18  1567.95    
94.34     2.22   47.25   4.74  22.22
dm-0              0.00     0.00  0.55  0.59    13.88     4.76    
16.23     0.04   34.44   7.02   0.81
dm-1              0.00     0.00 46.71 197.04  2812.84  1576.32    
18.01     5.23   21.44   0.89  21.61
dm-2              0.00     0.00  4.19  3.72    33.50    29.75     
8.00     1.10  139.24   1.72   1.36


-- 
S.Ali Ahsan

Senior System Engineer

e-Business (Pvt) Ltd

49-C Jail Road, Lahore, P.O. Box 676
Lahore 54000, Pakistan

Tel: +92 (0)42 3758 7140 Ext. 128

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Email: ali.ahsan at panasiangroup.com



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www.panasiangroup.com

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