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Doubts about oracle raid1 and raid5


Doubts about oracle raid1 and raid5

Imagine the following situation.

1st. Huge oracle database
2nd. Redo log, control file, archive log, undo and temp in raid1
3rd. All data files in raid5. 8 data vgs:data1,data2,data3,data4,data5,data6,data7 and data8
4th. SD with XP12000
5th. Disks 22 Gb
6th. Only raw devices

We have taken some statistics(statspack) and we have determined which are the files that suffers more write operations and we
are thinking to create 160 Gb of R1 and move these files.

Which do you think is the best option
1st. Include 1 R1 disk in each vg and move the files more written of this vg to the new R1 disk. This can be made
2nd. Create a new vg(i.e. vgraid1) with 8 disks and move the files more written from all vgs to this new vg. This
should be made offline Obviously the files would be stripped in this new vg.
3rd. Use more space and include 2 R1 disks in each vg. Strip the lvoles more written betweenf these two disks.

the second option seems to be the best but I am not sure about moving all the datafiles more written to only one
vg although this vg would have 8 disks and all the lvols would be stripped.

Regards and thanks,
Ivan Ferreira
Honored Contributor

Re: Doubts about oracle raid1 and raid5

I don't think that writting the data to one vg will reduce the performance as long as the disks that forms the vg are quick enough. I would go for the second option so you can separate r1 and r5 vgs.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?