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Home -> Community -> Mailing Lists -> Oracle-L -> Re: DISK configuration - help please.
You are lucky to have the compliment of disks available to configure. Our =
configuration consists of 2 drives RAID1 for the sys and ora volumes. All =
the data,temp,rollback,indexes are stored on 5 disks RAID5. The oracle =
waits are out of sight 30 - 40 % during the daily load of approx 150000 =
rows of data. The queries are acceptable but are unable to be improved =
upon because of the limitations created by "one" data drive.=20
Another possible concern is the single point of failure for the RAID5 =
dirves and that is the controller card. And data contamination coused by =
the controller card is propigated to all the drives in the RAID5 configurat=
ion. If the drives are configured to RAID1 then only one of the segments =
gets hit as compared to all on the RAID5.
My preference is to spread the segments across as many drives as =
possible and controllers as possible.
2bits:
Ron Rogers
DBA OCP
Atl.GA
>>> ATurner_at_concretemedia.com 08/17/00 10:46AM >>>
I am in the process of building two DB servers - one live and the other standby. We are not overly concerned with disk capacity - but rather with speed of access. =20
Our current configuration is=20
primary has 10 disks in RAID 0+1
standby has 6 disks in RAID 5
This is to give us 5 physical devices for production - I think a holdover =
of
OFA guidelines. =20
What I am looking for is a bit of advice on the best optin for current
configurations. I can add disks to this later. I am also using Veritas =
VM
and FS and so can relayout my RAID 5 to RAID 0+1 pretty easily as well.
Adding disks to the system is also a breaze.
All of these disks are in one FS mounted to /u01 .. .for easy management =
on
our site we elected one mount point and one very expandable FS. =20
I am considering breaking my configuration and going with 8 disks in 0+1 =
for
both systems - or going with 10 and 6 but both in 0+1 - I don't think that
RAID 5 is a good idea ever - even for a standby system, but there is some
pressure to have 5 physical devices and RAID 5 with 6 gives us that too...
Anybody out there willing to throw two cents my way?
thanks!
adam
--=20
Author: Adam Turner
INET: ATurner_at_concretemedia.com=20
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