lvreduce on RHEL 7

dipanjan · 07-09-2014, 03:18 AM

Hi, I am testing new RHEL7 but as per manuals The XFS file system has no utility to shrink a file system. XFS file systems can be grown online via the xfs_growfs command. So how could I perform lvreduce command ? because it requires shrink the file system first.Please give advice on it.

syg00 · 07-09-2014, 05:27 AM

And what do those same manuals suggest you do to achieve the same effect ?.
A quick search would no doubt get you to the XFS_FAQ.

dipanjan · 07-09-2014, 06:29 AM

Yes I have already searched this before posting. And I always try to find solution in google first before post here. If you read the docs of xfs faq you could also see this line "You can NOT make a XFS partition smaller online." (http://www.linuxquestions.org/questi...175510550/)And the official docs which I have followed is from redhat site and there has no solution at yet.You could find it here:
https://access.redhat.com/documentat...de/ch-xfs.html
My simple question is there any options to lvreduce using xfs or not???

syg00 · 07-09-2014, 06:53 AM

Quote:

Originally Posted by dipanjan

If you read the docs of xfs faq you could also see this line "You can NOT make a XFS partition smaller online."

And the very next sentence is ?.

dipanjan · 07-09-2014, 07:15 AM

Is it not painful and time taking to dump 4TB of data another place and restore it again? We could easily did using resize2fs in ext4.

dipanjan · 07-09-2014, 07:54 AM

Also in this solution where I use lvreduce? besides we make a new file system on it and restore the data.We can do it in normal partition as well so what is the need for lvm?
Ok thanks for help me on this issue.

syg00 · 07-09-2014, 08:11 AM

Same as after a resize2fs - you fix the filesystem up then reduce the lv.

The choice of LVM or not is yours, just like which filesystem you use - each has its own benefits/drawbacks. LVM has always been better when increasing space allocations - when first released it didn't even have a lvreduce command.

dipanjan · 07-09-2014, 09:15 AM

Yes that's true.Thank you once again.