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Full Discussion: Bash variable assignment failure/unary operator expected
Top Forums Shell Programming and Scripting Bash variable assignment failure/unary operator expected Post 303012648 by bakunin on Wednesday 7th of February 2018 08:39:06 AM
Old 02-07-2018
Furthermore there is an additional problem: depending on the LV you may need more than one PP to increase the LV by 1 LP. These PPs may (depending on the setting of the "strictness" property) have to come from different PVs.

For instance, here is a (part of the) rootvg of one of my NIM-servers and the LV of the /usr filesystem:

Code:
nimserver:/root# lsvg -l rootvg
rootvg:
LV NAME             TYPE       LPs     PPs     PVs  LV STATE      MOUNT POINT
hd5                 boot       1       2       2    closed/syncd  N/A
hd6                 paging     4       8       2    open/syncd    N/A
hd8                 jfs2log    1       2       2    open/syncd    N/A
hd4                 jfs2       12      24      2    open/syncd    /
hd2                 jfs2       26      52      2    open/syncd    /usr
...

nimserver:/root# lsvg rootvg
VOLUME GROUP:       rootvg                   VG IDENTIFIER:  00f6476900004c000000015cd4205282
VG STATE:           active                   PP SIZE:        256 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      1022 (261632 megabytes)
MAX LVs:            256                      FREE PPs:       790 (202240 megabytes)
LVs:                19                       USED PPs:       232 (59392 megabytes)
OPEN LVs:           18                       QUORUM:         1 (Disabled)
TOTAL PVs:          2                        VG DESCRIPTORS: 3
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         2                        AUTO ON:        no
MAX PPs per VG:     32512                                     
MAX PPs per PV:     1016                     MAX PVs:        32
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable 
PV RESTRICTION:     none                     INFINITE RETRY: no
DISK BLOCK SIZE:    512                      CRITICAL VG:    no
FS SYNC OPTION:     no                       CRITICAL PVs:   no

nimserver:/root# lslv hd2   
LOGICAL VOLUME:     hd2                    VOLUME GROUP:   rootvg
LV IDENTIFIER:      00f6476900004c000000015cd4205282.5 PERMISSION:     read/write
VG STATE:           active/complete        LV STATE:       opened/syncd
TYPE:               jfs2                   WRITE VERIFY:   off
MAX LPs:            32512                  PP SIZE:        256 megabyte(s)
COPIES:             2                      SCHED POLICY:   parallel
LPs:                26                     PPs:            52
STALE PPs:          0                      BB POLICY:      relocatable
INTER-POLICY:       minimum                RELOCATABLE:    yes
INTRA-POLICY:       center                 UPPER BOUND:    32
MOUNT POINT:        /usr                   LABEL:          /usr
MIRROR WRITE CONSISTENCY: on/ACTIVE                              
EACH LP COPY ON A SEPARATE PV ?: yes                                    
Serialize IO ?:     NO                                     
INFINITE RETRY:     no                     PREFERRED READ: 0

If i would increase the /usr filesystem by 256MB (=1LP) the VG must have at least 2 PPs free and they have to come from different disks because of the strictness setting (marked bold). Your script would test only for 256MB (=1PP) being free. For instance, in both of the following cases:

Code:
nimserver:/root# lsvg -p rootvg
rootvg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk1            active            511           1         1..0..0..0..0
hdisk2            active            511           0         0..0..0..0..0

nimserver:/root# lsvg -p rootvg
rootvg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk1            active            511          20         10..0..0..0..10
hdisk2            active            511           0         0..0..0..0..0

The increase would fail but your script would not anticipate this problem.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
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