Solaris

Hi folks,

i have a problem with my /app directory on solaris 10.It is mounted under rpool root and sometimes it increase dimension bringing root out of space.I want to mount /app under different position, maybe under secondary hardisk for which i have created a mount point with zfs pool...How can i mount /app under secondary disk using zpool?is it possible?are there any problems?

thank you in advance,

Matt

If /app is a part of rpool, then mounting it in a different location won't help you. If I understand you right, your rpool is running out if space from time to time.

What you can do, is set a reservation on the root filesystem. For example:

Code:

# zfs set reservation=15g rpool/ROOT/opensolaris

After this, the root Filesystem may grow up to 15G without interference from other datasets in the same pool.

You must find out the dataset name of the root filesystem for this:

Code:

# zfs list /
NAME                     USED  AVAIL  REFER  MOUNTPOINT
rpool/ROOT/opensolaris  6,90G   123G  6,78G  /

You create a zpool using that disk.

Code:

zpool create mypool <disk goes here>

Be sure to check if you need to make a mirror or raid array to protect your data from single disk failure.

After that, you will want to create a zfs filesystem in that zpool with :

Code:

zfs create -o mountpoint=/app mypool/app

And add the quotas, compression or any other zfs property to it.

Hope that helps
Regards
Peasant.

Thank you guys,

i'll try to describe in a better way my situation..
I have my DB and other applications under /app that is mounted under root pool.
I wonder if there exists a way to migrate /app under different pool (maybe under one mounted on a secondary HD, i have already one pool of that kind!), or to stop /app increasing and stealing space from ROOT. Now i have about 1GB left on root!

hergp, the solution you have given to me is the second one, rigth?

Is there another way to add more space only for /app or for root pool by using the secondary disk for example?

thanks

You can add more disks to a pool with the zpool add command without service interruption. But as Peasant pointed out, make sure, all data is redundant.

You can also migrate a complete ZFS filesystem with zfs send and zfs receive. But for that you need some downtime.

Regarding the first solution, what do you mean for data redundant?In my situation i ll add the second disk to the Root pool, so that it can expand using second disk, is it correct?

thanks

How many disks does your rpool use currently? If the pool is defined on a single disk and this disk fails, your server is dead.

If the pool is created on a pair of disks for redundancy and you add a single disk., then one part of your data is redundant and the other is not, which makes the pool vulnerable to a single disk fault.