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Full Discussion: Filesystem reduction size issue
Operating Systems AIX Filesystem reduction size issue Post 302900702 by borek on Thursday 8th of May 2014 09:51:24 AM
Old 05-08-2014
Filesystem reduction size issue
Hi,

Need help with following case. I am trying to shring filesystem size and reduce few luns from volume group. Situation looks like that :

Code:
# 
lsvg -l data1vg
data1vg:
LV NAME             TYPE       LPs     PPs     PVs  LV STATE      MOUNT POINT
data1            jfs2       3200    3200    4    open/syncd    /oracle/data1
data2            jfs2       3880    3880    5    open/syncd    /oracle/data2
loglv04             jfs2log    1       1       1    open/syncd    N/A

# lsvg -p data1vg
data1vg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdiskpower10      active            809         0           00..00..00..00..00
hdiskpower7       active            809         0           00..00..00..00..00
hdiskpower8       active            2023        662         44..405..175..00..38
hdiskpower9       active            1213        1157        243..187..242..242..243
hdiskpower0       active            4046        0           00..00..00..00..00

# lsvg -m rbddata2
rbddata2:/oracle/data2
LP    PP1  PV1               PP2  PV2               PP3  PV3
0001  1994 hdiskpower0       
[...]
1993  0470 hdiskpower10      
[...]   
2425  0395 hdiskpower7       
[...]     
2825  0986 hdiskpower8       
[...]
3825  0379 hdiskpower9       
[...]	  
3880  0434 hdiskpower9      


root@uk1gcnsd06301:# lslv data2
LOGICAL VOLUME:     data2               VOLUME GROUP:   data1vg
LV IDENTIFIER:      00c629e500004c000000012e52458c71.2 PERMISSION:     read/write
VG STATE:           active/complete        LV STATE:       opened/syncd
TYPE:               jfs2                   WRITE VERIFY:   off
MAX LPs:            10240                  PP SIZE:        128 megabyte(s)
COPIES:             1                      SCHED POLICY:   parallel
LPs:                3880                   PPs:            3880
STALE PPs:          0                      BB POLICY:      relocatable
INTER-POLICY:       minimum                RELOCATABLE:    yes
INTRA-POLICY:       edge                   UPPER BOUND:    128
MOUNT POINT:        /oracle/data2   LABEL:          /oracle/data2
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?:     NO
INFINITE RETRY:     no

# lsvg data1vg
VOLUME GROUP:       data1vg               VG IDENTIFIER:  00c629e500004c000000012e52458c71
VG STATE:           active                   PP SIZE:        128 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      8900 (1139200 megabytes)
MAX LVs:            512                      FREE PPs:       1819 (232832 megabytes)
LVs:                3                        USED PPs:       7081 (906368 megabytes)
OPEN LVs:           3                        QUORUM:         3 (Enabled)
TOTAL PVs:          5                        VG DESCRIPTORS: 5
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         5                        AUTO ON:        yes
MAX PPs per VG:     130048
MAX PPs per PV:     8128                     MAX PVs:        16
LTG size (Dynamic): 1024 kilobyte(s)         AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable
PV RESTRICTION:     none                     INFINITE RETRY: no

While executing command :

Code:
chfs -a size=-XGB

there is very high IO acitivity on affected disks :

Code:
tty:      tin         tout    avg-cpu: % user % sys % idle % iowait physc % entc
          0.0        550.0               14.4  57.0   21.0      7.5   0.4   85.2

Disks:        % tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdiskpower0    100.0     32160.0     259.0          8     32152
hdiskpower10     0.0       0.0       0.0          0         0
hdiskpower7      0.0       0.0       0.0          0         0
hdiskpower8      0.0       0.0       0.0          0         0
hdiskpower9     49.0     32000.0     250.0      32000         0

Filesystem above hung - application is not able to write there and hung until chfs is completed (-10G take about 6 mins...so 30MB/s - same value as iostat shows)

Question is what is happening below chfs command? LPs are fragmented across all disks...but LVM should remove last LPs (from hdiskpower9) and shrink filesystem. What data is written to hdiskpower0? Where to look?

Thoughts?
 

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