strpied lv

[tempest92]

hi guys,

can someone confirm if i have a problem with a striped logical volume

lslv u13Plv

LOGICAL VOLUME: u13Plv VOLUME GROUP: datavg01_p
LV IDENTIFIER: 000873653683920c.12 PERMISSION: read/write
VG STATE: active/complete LV STATE: opened/syncd
TYPE: jfs WRITE VERIFY: off
MAX LPs: 512 PP SIZE: 64 megabyte(s)
COPIES: 2 SCHED POLICY: striped
LPs: 90 PPs: 180
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: maximum RELOCATABLE: no
INTRA-POLICY: center UPPER BOUND: 3
MOUNT POINT: /u13P LABEL: /u13P
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes (superstrict)
Serialize IO ?: NO
STRIPE WIDTH: 3
STRIPE SIZE: 128k


lslv -m u13Plv

u13Plv:/u13P
LP PP1 PV1 PP2 PV2 PP3 PV3
0001 0218 hdisk13 0218 hdisk17
0002 0218 hdisk14 0218 hdisk31
0003 0218 hdisk12 0218 hdisk29
0004 0219 hdisk13 0219 hdisk17
0005 0219 hdisk14 0219 hdisk31
0006 0219 hdisk12 0219 hdisk29
0007 0220 hdisk13 0220 hdisk17
0008 0220 hdisk14 0220 hdisk31
0009 0220 hdisk12 0220 hdisk29
0010 0221 hdisk13 0221 hdisk17
0011 0221 hdisk14 0221 hdisk31
0012 0221 hdisk12 0221 hdisk29
0013 0222 hdisk13 0222 hdisk17
0014 0222 hdisk14 0222 hdisk31
0015 0222 hdisk12 0222 hdisk29
0016 0223 hdisk13 0223 hdisk17
0017 0223 hdisk14 0223 hdisk31
0018 0223 hdisk12 0223 hdisk29
0019 0224 hdisk13 0224 hdisk17
0020 0224 hdisk14 0224 hdisk31
0021 0224 hdisk12 0224 hdisk29
0022 0225 hdisk13 0225 hdisk17
0023 0225 hdisk14 0225 hdisk31
0024 0225 hdisk12 0225 hdisk29
0025 0226 hdisk13 0226 hdisk17
0026 0226 hdisk14 0226 hdisk31
0027 0226 hdisk12 0226 hdisk29
0028 0227 hdisk13 0227 hdisk17
0029 0227 hdisk14 0227 hdisk31
0030 0227 hdisk12 0227 hdisk29
0031 0228 hdisk13 0228 hdisk17
0032 0228 hdisk14 0228 hdisk31
0033 0228 hdisk12 0228 hdisk29
0034 0229 hdisk13 0229 hdisk17
0035 0229 hdisk14 0229 hdisk31
0036 0229 hdisk12 0229 hdisk29
0037 0230 hdisk13 0230 hdisk17
0038 0230 hdisk14 0230 hdisk31
0039 0230 hdisk12 0230 hdisk29
0040 0231 hdisk13 0231 hdisk17
0041 0231 hdisk14 0231 hdisk31
0042 0231 hdisk12 0231 hdisk29
0043 0232 hdisk13 0232 hdisk17
0044 0232 hdisk14 0232 hdisk31
0045 0232 hdisk12 0232 hdisk29
0046 0233 hdisk13 0233 hdisk17
0047 0233 hdisk14 0233 hdisk31
0048 0233 hdisk12 0233 hdisk29
0049 0234 hdisk13 0234 hdisk17
0050 0234 hdisk14 0234 hdisk31
0051 0234 hdisk12 0234 hdisk29
0052 0235 hdisk13 0235 hdisk17
0053 0235 hdisk14 0235 hdisk31
0054 0235 hdisk12 0235 hdisk29
0055 0236 hdisk13 0236 hdisk17
0056 0236 hdisk14 0236 hdisk31
0057 0237 hdisk12 0237 hdisk29
0058 0237 hdisk13 0237 hdisk17
0059 0237 hdisk14 0237 hdisk31
0060 0238 hdisk12 0238 hdisk29
0061 0238 hdisk13 0238 hdisk17
0062 0238 hdisk14 0238 hdisk31
0063 0239 hdisk12 0239 hdisk29
0064 0239 hdisk13 0239 hdisk17
0065 0239 hdisk14 0239 hdisk31
0066 0240 hdisk12 0240 hdisk29
0067 0240 hdisk13 0240 hdisk17
0068 0240 hdisk14 0240 hdisk31
0069 0241 hdisk12 0241 hdisk29
0070 0241 hdisk13 0241 hdisk17
0071 0241 hdisk14 0241 hdisk31
0072 0242 hdisk12 0242 hdisk29
0073 0242 hdisk13 0242 hdisk17
0074 0242 hdisk14 0242 hdisk31
0075 0243 hdisk12 0243 hdisk29
0076 0243 hdisk13 0243 hdisk17
0077 0243 hdisk14 0243 hdisk31
0078 0244 hdisk12 0244 hdisk29
0079 0244 hdisk13 0244 hdisk17
0080 0244 hdisk14 0244 hdisk31
0081 0245 hdisk12 0245 hdisk29
0082 0245 hdisk13 0245 hdisk17
0083 0245 hdisk14 0245 hdisk31
0084 0246 hdisk12 0246 hdisk29
0085 0246 hdisk13 0246 hdisk17
0086 0246 hdisk14 0246 hdisk31
0087 0247 hdisk12 0247 hdisk29
0088 0247 hdisk13 0248 hdisk14
0089 0247 hdisk14 0249 hdisk12
0090 0248 hdisk12 0249 hdisk14

3 LP's (88-90) have been added at some stage and i am concerned if i was to lose hdisk14 as then the stripe will be on 88 - hdisk13, 89 - hdisk12, 90 - hdisk12 what would happen as i have a superstrict allocation policy i.e. every LP should be on a seperate PV ?

thanks...........gary

 

[DSMARWAY]

hi ,
You wouldn't have a problem because if you lose hdisk14

currently from lp 88-90
hdisk14 has copy on hdisk12
hdisk13 has a copy on hdisk14
hdisk 12 has a copy on hdisk14

so you would still have hdisk12 and 13 available to carry
on working , but if you have 2 sites and hdisk14 & 12
are in the same site and same tray if that disk tray crashes
you'll have problems

so i would smitty rmlvcopy and remove the second copy
and do a smitty mklvcopy and use the correct disks i.e. 17,31 and 19

HTH

 

[tempest92]

hi dsmarway,

does it not matter that the stripe width is 3 disks and the stripe would be across hisk13, hdisk12, hdisk12 i.e 2 of the 3 on the same disk ?

thanks alot.

gary.

 

[DSMARWAY]

hi ,
if you see the PP/extent 247 its on 3 different disks
12,13 and 14 and 12 again for extent 248 , which i guess is your jfslog

since you have super strict set fro stripe you are right in saying it should have used the 3 disks and it would put an extent/PP it on 3 different disks otherwise you would have got some errors

How did you extend the stripe and manage to get it on different disks ? did you specify the disks manually ?