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тАО01-10-2001 05:45 PM
тАО01-10-2001 05:45 PM
Config opinions please?
Here's what I did:
1) Took all defaults on config (hot spare is active, etc...)
2) Created 4 LUNS of size 36gb each.
3) Created 4 standard physical volumes.
4) Created 2 volume groups, striped across controllers, using 2 LUNS for each VG:
vgcreate /dev/vg01 /dev/dsk/c4t0d0 /dev/dsk/c6t1d1
vgcreate /dev/vg02 /dev/dsk/c6t1d2 /dev/dsk/c4t0d3
5) Vgextended VGs to use alternate links
vgextend /dev/vg01 /dev/dsk/c6t1d0
vgextend /dev/vg01 /dev/dsk/c4t0d1
vgextend /dev/vg02 /dev/dsk/c4t0d2
vgextend /dev/vg02 /dev/dsk/c6t1d3
6) Created a bunch of logical volumes, spread evenly over the VGs based on I/O volume.
lvcreate -i2 -I8 -L 2048 -n ora_work1 /dev/vg02
etc...
7) Created filesystems (basic vxfs settings, the only special setting was an 8K blocksize).
Does all this seem reasonable?? Would you have done anything differently? Specifically I'm wondering about the number of LUNS, number of VGs and the stripe size of 8K on the LVs. I set the stripe size to 8K in order to match the filesystem, which also matches the Oracle block size.
I would really appreciate some experienced words of wisdom! I'm not very familiar with the autoraid technology.
Thanks!
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тАО01-10-2001 09:59 PM
тАО01-10-2001 09:59 PM
Re: Config opinions please?
This is what i'm doing to handle load-balancing.
vgcreate /dev/vg01 /dev/dsk/c4t0d0 /dev/dsk/c4t0d1
vgcreate /dev/vg02 /dev/dsk/c6t1d2 /dev/dsk/c6t1d3
5) Vgextended VGs to use alternate links
vgextend /dev/vg01 /dev/dsk/c6t1d0
vgextend /dev/vg01 /dev/dsk/c6t1d1
vgextend /dev/vg02 /dev/dsk/c4t0d2
vgextend /dev/vg02 /dev/dsk/c4t0d3
Traffic to vg01 will be routed to controller A (under assumption that SCSI ID is 0) and traffic to vg02 will be driven to controller B on AutoRAID.
Regards,
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тАО01-11-2001 11:08 AM
тАО01-11-2001 11:08 AM
Re: Config opinions please?
The only way to ensure load ballancing between the controlers is to use LVM striping.
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тАО01-11-2001 12:06 PM
тАО01-11-2001 12:06 PM
Re: Config opinions please?
When I created the logical volumes, I specified the "-i2" option which told it to stripe across 2 drives. In my case the 2 drives would be 2 separate LUNS, and should be accessed through different controllers because of the way I set up the VGs (I thought).
When I created the VGs, I used 2 device files, one through controller X and one through controller Y.
Is there more to the LVM striping than this? I'm confused.
Thanks, I really appreciate the help.
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тАО01-11-2001 01:12 PM
тАО01-11-2001 01:12 PM
Re: Config opinions please?
Add your 2 disks, 1 from each controller, into your volume group. Also put them in a physical volume group. This can be done with vgcreate, in sam or by editing the file /etc/lvmpvg. The entry would look like this:
VG /dev/vg01
PVG PVG1
/dev/dsk/c2t0d2
/dev/dsk/c5t0d3
Then when you create your logical volumes use the Distibuted option, -D.
lvcreate -D y -s g -n lvol1 /dev/vg01
lvextend -L 1024 /dev/vg01/lvol1 PVG1
This creates a 1GB logical volume that is stripped across the 2 disks. Works great. If you want to extend this logical volume later you can. You can also mirror the logical volume if you want to. If you use LVM striping you can not mirror it also.