[DRBD-user] Healthy System -- But Odd Iostat Output

Robinson, Eric eric.robinson at psmnv.com
Mon May 11 18:06:02 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


 
Hi guys, 

On a 2-node cluster where each node has 2 drbd devices, why does iostat
on cluster node HA03 show only drb0, while node HA04 shows both drbd0
and drbd1?

HA03:

[root at ha03 ~]# iostat
Linux 2.6.18-92.1.22.el5PAE (ha03.mycharts.md)  05/08/2009

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.60    0.01    0.74    1.26    0.00   97.40

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda              90.36      3556.48       737.54 1132380817  234833149
dm-0            179.58      3524.76       620.27 1122280905  197492218
dm-1              4.57         0.12        36.45      39725   11606789
drbd0           160.86      3524.68       521.18 1122255260  165942472

[root at ha03 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.0.14 (api:86/proto:86)
GIT-hash: bb447522fc9a87d0069b7e14f0234911ebdab0f7 build by
root at ha03.mycharts.md, 2008-12-23 04:36:40
m:res       cs         st                 ds                 p  mounted
fstype
0:ha_mysql  Connected  Primary/Secondary  UpToDate/UpToDate  C /ha_mysql
ext3
1:ha_ftp    Connected  Secondary/Primary  UpToDate/UpToDate  C


HA04:

[root at ha04 ~]# iostat
Linux 2.6.18-92.1.22.el5PAE (ha04.mycharts.md)  05/08/2009

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.14    0.01    0.29    0.89    0.00   98.68

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda              69.39       544.57       867.66  173600433  276599076
dm-0             91.51       437.38       614.05  139431239  195751408
dm-1             11.47        95.84        36.58   30552183   11660807
drbd0            25.13       437.30        91.74  139405546   29246048
drbd1            11.30        95.71        36.43   30512394   11611928

[root at ha04 ~]# service drbd status
drbd driver loaded OK; device status:
version: 8.0.14 (api:86/proto:86)
GIT-hash: bb447522fc9a87d0069b7e14f0234911ebdab0f7 build by
root at ha04.mycharts.md, 2008-12-22 06:11:56
m:res       cs         st                 ds                 p  mounted
fstype
0:ha_mysql  Connected  Secondary/Primary  UpToDate/UpToDate  C
1:ha_ftp    Connected  Primary/Secondary  UpToDate/UpToDate  C  /ha_ftp
ext3

--------------
BONUS QUESTION
--------------

Why does the lvdisplay command on HA04 preceed ever line of output with
the word "lvdisplay?" Node HA03 does not do this.

[root at ha04 ~]# lvdisplay
lvdisplay  --- Logical volume ---
lvdisplay  LV Name                /dev/vg01/lv01
lvdisplay  VG Name                vg01
lvdisplay  LV UUID                0mpN50-4dDv-0prI-PLBd-slvJ-PStA-eCkxvC
lvdisplay  LV Write Access        read/write
lvdisplay  LV Status              available
lvdisplay  # open                 2
lvdisplay  LV Size                400.00 GB
lvdisplay  Current LE             102400
lvdisplay  Segments               1
lvdisplay  Allocation             inherit
lvdisplay  Read ahead sectors     auto
lvdisplay  - currently set to     256
lvdisplay  Block device           253:0
lvdisplay
lvdisplay  --- Logical volume ---
lvdisplay  LV Name                /dev/vg01/lv02
lvdisplay  VG Name                vg01
lvdisplay  LV UUID                AKbuTX-z1iE-GLhw-Nc1X-FERw-qrBL-HZBfJL
lvdisplay  LV Write Access        read/write
lvdisplay  LV Status              available
lvdisplay  # open                 2
lvdisplay  LV Size                620.00 GB
lvdisplay  Current LE             158720
lvdisplay  Segments               1
lvdisplay  Allocation             inherit
lvdisplay  Read ahead sectors     auto
lvdisplay  - currently set to     256
lvdisplay  Block device           253:1
lvdisplay

--
Eric Robinson




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