"Chad R. Larson" <[EMAIL PROTECTED]> writes:
> At 01:31 PM 5/26/02 , Manuel Sugawara wrote:
> >-RAID (5+0) A logical volume with several RAID 3 logical member
> >drives.
>
> Perhaps a typo?
Yes :-(
Regards,
Manuel.
---(end of broadcast)---
TIP 1
At 01:31 PM 5/26/02 , Manuel Sugawara wrote:
>-RAID (5+0) A logical volume with several RAID 3 logical member
>drives.
Perhaps a typo?
We built what we called a "plaid", in which we built RAID 5 arrays on Sun
A3500 (hardware RAID with cache) [think horizontal] and then striped across
the RAID
On Fri, 24 May 2002, Kris Deugau wrote:
[snip]
KD> Note that if you're looking for a system you can hotswap, you will
KD> probably need to go SCSI in any case; I'm not aware of any
KD> hotswap-capable IDE RAID systems.
Not exactly ;-)
Promise TX2 and TX4 with special enclosures do the trick.
> On Sun, May 26, 2002 at 08:00:50AM -0700, Bill Cunningham wrote:
> > No Raid 10 is Raid 1 + 0 its strong points are faster writes but slower
> > reads.
>
> RAID 10 reads will actually be faster than RAID 5, but it will require
> more disks. (2n instead of n+1).
There also seems to be a combinat
Peter Eisentraut <[EMAIL PROTECTED]> writes:
> There are also other levels. One poster talked about RAID 10 which
> appears to be a mirrored RAID 5.
Those are multi-level RAID systems:
- RAID (0+1) RAID 1 (high availability) plus RAID 0 (enhaced I/O
performace through striping).
- RAID (3+0)
On Sun, May 26, 2002 at 08:00:50AM -0700, Bill Cunningham wrote:
> No Raid 10 is Raid 1 + 0 its strong points are faster writes but slower
> reads.
RAID 10 reads will actually be faster than RAID 5, but it will require
more disks. (2n instead of n+1).
--
Ragnar Kjorstad
Big Storage
-
Peter Eisentraut wrote:
>Tom Lane writes:
>
>
>
>>Is there any rhyme or reason to the various "RAID n" designations?
>>Or were they just invented on the spur of the moment?
>>
>>
>
>The paper that introduced the term RAID used a numerical classification
>for the various schemes. (So I gues
On Sat, May 25, 2002 at 12:45:12PM -0700, Fred Moyer wrote:
> Performance (fastest->slowest)
> hardware raid -> software raid
> raid 0 -> 10 -> 1 -> 5
> Redundancy (most -> least)
> hardware raid -> software raid
> 10, 1 -> 5 -> 0
It's really not possible to compare RAID-l
On Fri, 24 May 2002, Rajesh Kumar Mallah. wrote:
> I am setting up a new database server.
> the data is critical that is why i am thniking
> to mirror the SCSI disks in RAID 1 configuration.
> I do not have a hardware raid controller.
> could anyone give me some pointer , or suggest me
> if its a
JBOD : just a bunch of disks, not raid in my opinion
Raid 0 : striping over disks, no redundancy, hence the Redundancy in
Redundant Arrays of Independent Disks is zero.
Raid 1 : Mirroring, full redundancy, Redundancy 1(00%)
Raid 4: see thread
Raid 5: see thread,Striping across multiple disks wi
On Sat, May 25, 2002 at 09:29:01PM +0200, Peter Eisentraut wrote:
> 0 Nonredundant
> 1 Mirrored
> 2 Memory-style ECC
> 3 Bit-interleaved parity
> 4 Block-interleaved parity
> 5 Block-interleaved distributed parity
> [Hennessy & Patterson]
>
> There are also other levels. One poster talked
Tom Lane writes:
> Is there any rhyme or reason to the various "RAID n" designations?
> Or were they just invented on the spur of the moment?
The paper that introduced the term RAID used a numerical classification
for the various schemes. (So I guess the answer is yes.) The traditional
levels
om: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Rajesh Kumar
Mallah.
Sent: Friday, May 24, 2002 10:15 PM
To: pgsql-admin
Subject: Re: [ADMIN] databases and RAID ...
Hi Fred,
I have only two hardisks and no HW card.
how can i utilize them best?
i do not want to loose data one fine day
disco
On Fri, 2002-05-24 at 15:58, Kris Deugau wrote:
> "Rajesh Kumar Mallah." wrote:
> > I am setting up a new database server.
> > the data is critical that is why i am thniking
> > to mirror the SCSI disks in RAID 1 configuration.
> > I do not have a hardware raid controller.
>
> If it's that critic
Hi Fred,
I have only two hardisks and no HW card.
how can i utilize them best?
i do not want to loose data one fine day
discovering one my SCSI havaing DB
has failed.:-(
should i run database on only 1 18GB scsi and
pg_dump every 6 hrs my critical tables
on other machine (which has not
"Fred Moyer" <[EMAIL PROTECTED]>(by way of Rajesh Kumar Mallah.
<[EMAIL PROTECTED]>) writes:
> use raid 10 (striping with mirroring) if you have more than 2 hard
> disks. much faster than raid 1.
Is there any rhyme or reason to the various "RAID n" designations?
Or were they just invented on th
use raid 10 (striping with mirroring) if you have more than 2 hard
disks. much faster than raid 1.
> Hi
>
> I am setting up a new database server.
> the data is critical that is why i am thniking
> to mirror the SCSI disks in RAID 1 configuration.
>
> I do not have a hardware raid controller.
>
, but i would definitly
look into a hardware raid controller if you could.
hope thishelps
corey
-Original Message-
From: Rajesh Kumar Mallah. [SMTP:[EMAIL PROTECTED]]
Sent: Friday, May 24, 2002 5:55 AM
To: [EMAIL PROTECTED]
Subject:[ADMIN] databases and RAID ...
Hi
I am se
I would use hardware RAID level 1 for performance reasons.
Egon
"Rajesh Kumar Mallah." wrote:
> Hi
>
> I am setting up a new database server.
> the data is critical that is why i am thniking
> to mirror the SCSI disks in RAID 1 configuration.
>
> I do not have a hardware raid controller.
>
> cou
"Rajesh Kumar Mallah." wrote:
> I am setting up a new database server.
> the data is critical that is why i am thniking
> to mirror the SCSI disks in RAID 1 configuration.
> I do not have a hardware raid controller.
If it's that critical, you would be wise to go buy a hardware RAID
controller.
>
Rajesh Kumar Mallah. wrote:
> Hi
>
> I am setting up a new database server.
> the data is critical that is why i am thniking
> to mirror the SCSI disks in RAID 1 configuration.
>
> I do not have a hardware raid controller.
>
> could anyone give me some pointer , or suggest me
> if its advisable
Hi
I am setting up a new database server.
the data is critical that is why i am thniking
to mirror the SCSI disks in RAID 1 configuration.
I do not have a hardware raid controller.
could anyone give me some pointer , or suggest me
if its advisable to use RAID 1 with database servers.
thanks
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