File System

[Aggy]

We will be upgrading our 10.20 to 11i.I wanted some info. on disk configuration.
In the fileystem tab when we configure the disk
for / /stand /tmp /opt /var
It comes up with options as Fixed MB,All remaining,FreeMB,Free %, Range MB.
What is the significance of this.
Cannot I just put fixed MB for everything, What is the advantage/disadvantage if I do this.

For /stand the default was HFS-Fixed MB and for /opt it is Free MB ????
Initially on 10.20 we were using HFS ans now on 11i we will be using JFS.

[Pete Randall]

I always use fixed MB for everything. The formulas might be handy if you're installing on many machines with different size root disks simultaneously but I prefer to set my sizes exactly so I know what I'm getting. A recent question had some recommendations for sizes:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xa1c0b71be87ac044bb89578e7ecf9245,00.html


Pete

[Pete Randall]

Oops, sorry about the double post!

I was going to point out that /stand has to be HFS - all the other file systems should be JFS.


Pete

[Tim Sanko]

Actually aggy, HFS may be more efficient if you are using a Symmetrix or other large array. The question is performance to reliability. JFS is more reliable, but HFS can be much higher throughput for Oracle or other DB. Then there are raw partitions...

I have my 36GB of vg00 configured to look like this:

/dev/vg00/lvol3 2621440 2521976 99464 96% /
/dev/vg00/lvol1 511672 60088 400416 13% /stand
/dev/vg00/lvol8 10485760 4057784 6378856 39% /var
/dev/vg00/lvol7 2301952 1639904 656928 71% /usr
/dev/vg00/lvol4 1048576 302736 740656 29% /tmp
/dev/vg00/lvol6 4194304 1247504 2923800 30% /opt

This is for a large DB server. I would scale appropriately for a smaller technical server type box.

Still I recommend 1.5 GB for root. It becomes annoying to have to run ignite to boost the vg00 partitions more than once. This large size is more important if you have /home on the root volume. I have an 8gb swap/dump that will go unreported.

/var I have very large as I have needed to back out patches more than once, and some of our application will be loaded there. (This was going to be an ignite server too, but we have other plans now)

If you don't have any databases. I would recommend 4GB for /var, 2GB for /usr 1.5 gb /
512mb for /tmp and don't forget your swap partition. Proper planning makes the job much easier.

Tim

[Patrick Wallek]

I have always used FIXED MB when installing the OS. I have never quite understood the significance of the other options either. I am with Pete, I like to know EXACTLY how much I am configuring and how much of the disk will be used.

My recommendations for LV sizeing:

/dev/vg00/lvol3 256MB /
/dev/vg00/lvol1 300MB /stand
/dev/vg00/lvol8 3GB /var
/dev/vg00/lvol7 3GB /usr
/dev/vg00/lvol6 1GB /tmp
/dev/vg00/lvol5 3GB /opt
/dev/vg00/lvol4 1GB /home
swap space = 1.5 GB

I also have to comment on 1.5 GB for / -- Sorry but in my opinion that is WAY overkill. There's no way / should ever be that big. Just my opinion.