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Migrtd lun from v2 to v3 , huge perfmnce issue

 
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chindi
Respected Contributor

Migrtd lun from v2 to v3 , huge perfmnce issue

Hi we hv recetly migrtd many app n db luns from v2 to v3.
After which we are facing tremendous iops bottleneck at filesystem level....When we create a new filesystem same batch job runs fine in same load conditions , but exstg filesystem simply chokes during load condtns.
Will fsadm -e help us , its 5.01 fs that we have
3 REPLIES 3
Patrick Wallek
Honored Contributor

Re: Migrtd lun from v2 to v3 , huge perfmnce issue

A reorganize of the file system MIGHT help, but I kind of doubt it.  I would think that you would have seen the same performance issues on the 11iv2 server if that were the case.

 

It is possible, I think it is a remote possibility, that a new file system is using a newer file system layout version.  You can check this with the 'fstyp -v' command and specify the raw logical volume name. See my examples below.

 

For example:

 

My /opt file system (/dev/vg00/lvol7):

 

# fstyp -v /dev/vg00/rlvol7
vxfs
version: 6
f_bsize: 8192
f_frsize: 8192
f_blocks: 1671168
f_bfree: 760687
f_bavail: 754745
f_files: 293056
f_ffree: 190144
f_favail: 190144
f_fsid: 1073807370
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 10
f_size: 1671168

 

# bdf /opt
Filesystem          kbytes    used   avail %used Mounted on
/dev/vg00/lvol7    13369344 7283848 6038000   55% /opt

You can upgrade the file system layout of a VxFS filesystem with the vxupgrade command while the file system is still online (I would probably shut down any applications or databases though):

 

# vxupgrade -n 7 /opt

 

# fstyp -v /dev/vg00/rlvol7
vxfs
version: 7
f_bsize: 8192
f_frsize: 8192
f_blocks: 1671168
f_bfree: 760546
f_bavail: 754605
f_files: 293024
f_ffree: 190112
f_favail: 190112
f_fsid: 1073807370
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 10
f_size: 1671168

It is now layout version 7.

 

chindi
Respected Contributor

Re: Migrtd lun from v2 to v3 , huge perfmnce issue

Hi Patrick ,

 

You were spot on .

We were struggling for the past 90 days with this issue.

We tried all probabilities , today we would be implementing your VALUABLE suggestion for all of our DB luns.

We always were working on test servers with new filesystem v 7 , the same model as of prodcution ie rx2800 i4 and were getting performance , but we were simply thinking that it could be strorage issue , mayb kernel params, tried everything in production.

 

But now lets hope for the best.

Will update you tomorrow .

 

Thanks again.

 

 

chindi
Respected Contributor
Solution

Re: Migrtd lun from v2 to v3 , huge perfmnce issue

Hi Patrick,

We had to migrate data to new filesystem , even vxupgrade didnt work for us :(.