:[EMAIL PROTECTED]
Sent: Wednesday, August 13, 2003 11:14 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: Raid 1 vs Raid 5 for tablespaces
The _only_ even theoretical advantage to software RAID-0 is
that software
RAID implementations tend to have more flexibility than
/13/2003 05:14 PM
Please respond to ORACLE-L
To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
cc:
Subject:RE: Raid 1 vs Raid 5 for tablespaces
Yes and no - its a semantical issue. If you want to grow a Veritas volume with the RAID under hardware control
of list ORACLE-L
Subject: RE: Raid 1 vs Raid 5 for tablespaces
The _only_ even theoretical advantage to software RAID-0 is
that software
RAID implementations tend to have more flexibility than the
hardware ones.
For example, there are a number of software RAID
implementations
://www.gridapp.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Jared Still
Sent: Wednesday, August 13, 2003 11:54 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: Raid 1 vs Raid 5 for tablespaces
Tim,
Are you suggesting that HW RAID 1 with SW
The AIX LVM supports RAID-0 and RAID-1, but not together, as you state.
However, a rude form of RAID-0 can be achieved by specifying max allocation
policy, which will cause round-robin distribution of physical extents (PEs)
across a list of physical volumes (PVs), thereby approximately RAID-0 at
Title: RE: Raid 1 vs Raid 5 for tablespaces
Ask the BAARF committee NO RAID 5(or four or free ;o)
-Original Message-
From: Schauss, Peter [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 12, 2003 2:24 PM
To: Multiple recipients of list ORACLE-L
Subject: Raid 1 vs Raid 5
, August 13, 2003 11:14 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: Raid 1 vs Raid 5 for tablespaces
The _only_ even theoretical advantage to software RAID-0 is
that software
RAID implementations tend to have more flexibility than the
hardware ones.
For example
saying 'is it installed yet?'
Niall
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mladen Gogala
Sent: 14 August 2003 14:59
To: Multiple recipients of list ORACLE-L
Subject: RE: Raid 1 vs Raid 5 for tablespaces
It robs of CPU power, that's true
Actually, as of AIX 4.3.3, it does support 0+1 for LVs, but that wasn't the
scenario I was imagining. I was envisioning creating a set of RAID-1 raid
groups on the storage array and then striping across them using the LVM.
RAID-1 is one of those things that I feel is generally better to let your
]
Sent: Wednesday, August 13, 2003 11:14 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: Raid 1 vs Raid 5 for tablespaces
The _only_ even theoretical advantage to software RAID-0 is
that software
RAID implementations tend to have more flexibility than the
hardware ones
Tim,
Are you suggesting that HW RAID 1 with SW RAID 0 is a better
combination than HW RAID 1 and HW RAID 0?
If so, why?
Jared
On Tue, 2003-08-12 at 21:59, Tim Gorman wrote:
Software RAID-1 can mirror across controllers, channels, and storage arrays,
should any of those be considered a
/HRIDDSent: Tuesday, August 12, 2003
3:35 PMTo: Multiple recipients of list ORACLE-LSubject:
RE: Raid 1 vs Raid 5 for tablespaces
Ask the BAARF committee NO RAID 5(or four or free
;o)
-Original Message- From:
Schauss, Peter [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 12,
lto:[EMAIL PROTECTED] On Behalf Of Jared Still Sent:
Wednesday, August 13, 2003 11:54 AM To: Multiple recipients of list
ORACLE-L Subject: Re: Raid 1 vs Raid 5 for tablespaces
Tim, Are you suggesting that HW
RAID 1 with SW RAID 0 is a better combination than HW RAID 1 and HW
Software RAID-1 can mirror across controllers, channels, and storage arrays,
should any of those be considered a single-point-of-failure...
The combination of HW RAID-1 and SW RAID-0 is optimal for performance, if
the HW supports it...
on 8/12/03 9:04 PM, Matthew Zito at [EMAIL PROTECTED]
[EMAIL PROTECTED]
cc:
Subject:RE: Raid 1 vs Raid 5 for tablespaces
The _only_ even theoretical advantage to software RAID-0 is that software
RAID implementations tend to have more flexibility than the hardware ones.
For example, there are a number of software RAID implementations
Is this perhaps a T-3 Disk Storage Array?
-Original Message-
To: Multiple recipients of list ORACLE-L
Sent: 8/12/2003 2:24 PM
Our hardware people tell me that our disk array will not support Raid
10.
Given a choice between Raid 1 or 5 for my tablespaces, which one
is best? This is
For the record, I often suggest using RAID level 5 with the group size
set to 2.
:)=)
(In case you're interested, RAID level 5 with G=2 *is* RAID level 1.)
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
- Hotsos Clinic 101 in Denver, Sydney
- Hotsos Symposium
Actually, as of AIX 4.3.3, it does support 0+1 for LVs, but that wasn't the
scenario I was imagining. I was envisioning creating a set of RAID-1 raid
groups on the storage array and then striping across them using the LVM.
RAID-1 is one of those things that I feel is generally better to let your
Depends on the storage array and your particular configuration. You could
certainly create a bundle of RAID-1 luns/volumes and then create a larger
concatenated volume across them, but you're very likely to end up with
hotspots on the first few disks. Whether that matters or not is dependent
Title: RE: Raid 1 vs Raid 5 for tablespaces
Mladen,
I'll send you some developers that will code some JAVA stuff that will pegg all your CPUs.
Raj
-Original Message-
From: Mladen Gogala [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 14, 2003 9:59 AM
To: Multiple recipients
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