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Full Discussion: 2.6TB filesystem to be copied or moved to another FS ?
Operating Systems AIX 2.6TB filesystem to be copied or moved to another FS ? Post 302481575 by filosophizer on Saturday 18th of December 2010 03:30:45 PM
Old 12-18-2010
2.6TB filesystem to be copied or moved to another FS ?
Hi folks,

I have a filesystem which is 2.6TB big and would like to copy/mirror this filesystem on another volume group.

1) What is the fastest way to copy or mirror it to another filesystem without shutting down production vg ( oracle is using the filesystem )

2) Is there any way to estimate how long it will take to copy/mirror the filesystem if it is required to shutdown Oracle ?

/u03 is the filesystem which has to be copied/moved to another new filesystem

two options which i thought of:
(1) to mirrorvg ie., mirror oraclevg to the new vg but this process will be very slow if ORACLE is running is continuously accessing the filesystem /u03 while mirror process is under way.

(2) shutdown oracle, use copy filesystem command and move it, but need to know how long will it take to move 2.6TB since Oracle cannot be down for more than 10 hours
Code:
 
# lspv
  
hdisk0          000f4c011b1e8d57                    rootvg          active
  
hdisk1          000f4c017d3b0cd9                    rootvg          active
  
hdisk2          000f4c01fc5f525f                    oraclevg        active
  
hdisk4          000f4c01b4e565d1                    oraclevg2       active
  
hdisk3          000f4c01d80cdc0b                    oraclevg        active
  
# lsvg -l oraclevg
  
oraclevg:
  
LV NAME             TYPE       LPs     PPs     PVs  LV STATE      MOUNT POINT
  
loglv00             jfs2log    1       1       1    open/syncd    N/A
  
fslv01              jfs2       5178    5178    2    open/syncd    /u03
      
# lsvg -p oraclevg
  
oraclevg:
  
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
  
hdisk2            active            4079        0           00..00..00..00..00
  
hdisk3            active            1100        0           00..00..00..00..00
  
#
    
# lsvg oraclevg
  
VOLUME GROUP:       oraclevg                 VG IDENTIFIER:  000f4c010000d9000000011dfc87db92
  
VG STATE:           active                   PP SIZE:        512 megabyte(s)
  
VG PERMISSION:      read/write               TOTAL PPs:      5179 (2651648 megabytes)
  
MAX LVs:            256                      FREE PPs:       0 (0 megabytes)
  
LVs:                2                        USED PPs:       5179 (2651648 megabytes)
  
OPEN LVs:           2                        QUORUM:         2 (Enabled)
  
TOTAL PVs:          2                        VG DESCRIPTORS: 3
  
STALE PVs:          0                        STALE PPs:      0
  
ACTIVE PVs:         2                        AUTO ON:        yes
  
MAX PPs per VG:     30480
  
MAX PPs per PV:     5080                     MAX PVs:        6
  
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
  HOT SPARE:          no                       BB POLICY:      relocatable




---------- Post updated at 12:30 PM ---------- Previous update was at 07:30 AM ----------

I did little research on the internet and found few documents which showed the recommended procedure

1) either by backup and restore ( which will preserve the file permissions and inode information )

2) cplv

now regarding cplv, no document points out the following and i hope some knows the answer here on the forum

1) can it be used to copy 2.6 TB ? since it is very big filesystem ?

2) will it preserve file permissions and inode information ?

3) what is the transfer/copy speed ? this is important to know since cplv can be only done when the filesystem is unmounted ( not in use ) so 2.6TB takes like 2 days then have to go with another solution like backup and restore.

thanks
 

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