best volume manager on red hat

Hi all

we will migrate our cor systems SAP from Solaris which running on Sparc servers  to red hat 7.x red hat enterprise which will run on vmware

i don't really know if this good or bad but the manager deiced like this and we are going to do it .

but the question is

we use to use veritas volume manger VXVM to manage or volumes on Solaris

and my manger said after we move to red hat we will not use VXVM because of the  license

so my question what the best replacement for VXVM in our case to have full flexibility to expand and shrink and mirror - replicate - etc the volumes on red hat

i don't know about LVM  and i don't know how we can manage this

any idea ? any advice ? it will be  appropriated .

thanks
sword
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sword12Asked:
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Joseph GanSystem AdminCommented:
You have no choice but using LVM if you couldn't use VXVM in RHEL. Best thing is it is free, although it is not as flexible as volume manager in Solaris.
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sword12Author Commented:
Hi ganjos

i know i can with LVM to expand the file system online

but i don't know if i can shrink the file system online using LVM

is it possible ?

thanks
sword
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Manfred BertlManagerCommented:
In LVM there are commands to resize or reduce volumes, 'lvresize' and 'lvreduce'. AFAIK, it is not possible to have the filesystem mounted while reducing its size, and you also have to take care of the data in that volume to be backed up.
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sword12Author Commented:
thank you Mbertl for your answer
can i ask you different question

now i am trying to install red hat Enterprise 7.1 on on a vm  and i want this vm to be as webserver and has oracle data base also 11.2
 the data base size will be around 80

can you give me advice how to much storage i can give t this vm and what the best practice to partition this disks

and which best flexible file system i can choose


thanks
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Manfred BertlManagerCommented:
Not knowing anything about your VMWare hardware, i would start with at least 8GB RAM, having at least 500MB for the boot partition (which is the default anyway), the root partition at least 15GB. Depending on the directories you are going to install your services (webserver and database), i would size the /var filesystem at least the double of your current data size. Remind, this is only a recommendation.

For the filesystem, XFS is the default in Red Hat 7, but you can choose most other filesystems which are currently available on linux. XFS is fairly flexible to use and has many features. For most flexibility you might be interested in ZFS, but i don't know much about the current development status and availability of the linux port.
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sword12Author Commented:
so what about
/                20 G
/boot        500 MB
/home       10 G
/tmp           10G
/u01            80G
/usr             10G
/var              160



please correct me or add or remove what you want
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Manfred BertlManagerCommented:
looks good to me.... if you install your database server in another directory than /var, you might not need the 160Gigs there for the webserver only. As said before: depends on your current size of data.
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