[dba-Tech] Performance in disc partitions

Lembit Soobik lembit.dbamail at t-online.de
Mon Jan 28 12:21:08 CST 2008


Remember when you move your RAID controller to a new machine, you got to 
install the drivers there also,
and by the time your system fails, the driverboard will not fit into the new 
system.

Lembit

----- Original Message ----- 
From: "jwcolby" <jwcolby at colbyconsulting.com>
To: "'Discussion of Hardware and Software issues'" 
<dba-tech at databaseadvisors.com>
Sent: Monday, January 28, 2008 6:37 PM
Subject: Re: [dba-Tech] Performance in disc partitions


>I absolutely agree.  The onboard raid will not work the same with a new
> motherboard and so all data in the raid array will be lost.
>
>
> John W. Colby
> Colby Consulting
> www.ColbyConsulting.com
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Erwin Craps - 
> IT
> Helps
> Sent: Monday, January 28, 2008 11:50 AM
> To: Discussion of Hardware and Software issues
> Subject: Re: [dba-Tech] Performance in disc partitions
>
> I personally would never use an onboard raid to store data.
>
> If U use a removable controller you can swap controller and disks to 
> another
> system when your system is defect.
> Doing so you have your data back in a few minutes...
>
> Since the OS is pretty much system depending, you could use the onboard 
> raid
> only for your OS disk.
>
> Erwin
>
>
>
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of DJK(John)
> Robinson
> Sent: Monday, January 28, 2008 5:38 PM
> To: 'Discussion of Hardware and Software issues'
> Subject: Re: [dba-Tech] Performance in disc partitions
>
> All my discs seem just fine, and have just been thrashed by PassMark's
> Performance Test.  HD Tune (v2.54) never gets to the stage of looking at
> them, as far as I can tell.  (Tried re-installing:  no difference.) Maybe
> another day, another system.
>
> Thanks anyway
> John
>
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Erwin Craps
> - IT
> Helps
> Sent: 28 January 2008 15:47
> To: Discussion of Hardware and Software issues
> Subject: Re: [dba-Tech] Performance in disc partitions
>
>
> Hummm, never had any problem with HD Tune on any system I ever used it.
>
> Maybe you have a disk prob?
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of DJK(John)
> Robinson
> Sent: Monday, January 28, 2008 3:08 PM
> To: 'Discussion of Hardware and Software issues'
> Subject: Re: [dba-Tech] Performance in disc partitions
>
> Hi Erwin
>
> I tried HDtune, but it spends most of its time Not Responding so I've 
> binned
> it.  May be something to do with my system, of course.
>
> John
>
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Erwin Craps
> - IT
> Helps
> Sent: 28 January 2008 10:18
> To: Discussion of Hardware and Software issues
> Subject: Re: [dba-Tech] Performance in disc partitions
>
>
> The edge of the disk also means lower access times.
> I don't know why because RPM is the same at the inner as outer side of the
> disk.
>
> I know that CD drives change their RPM speed depending how far they are on
> the inner and outer side of a cd so the laser can keep up reading the 
> data,
> don't know if that is true for HD. That could be an explanation for lower
> access times, because it takes longer for the data to pass the head.
>
>
> You can check http://www.hdtune.com/ it's a free disk performance check, 
> it
> will show you the transfer rate / access time for your disk over the whole
> disk.
>
> Erwin
>
>
>
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of DJK(John)
> Robinson
> Sent: Monday, January 28, 2008 10:34 AM
> To: 'Discussion of Hardware and Software issues'
> Subject: Re: [dba-Tech] Performance in disc partitions
>
> Thanks, John.  That would suggest higher transfer rates nearer the edge,
> with some cylinders holding more than others.
>
> Has anyone got any good links to this sort of stuff?
>
> Oh, and of course I'm still interested in knowing whether the 'first'
> partition is nearer the edge or the spindle...
>
> John
>
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of jwcolby
> Sent: 28 January 2008 00:57
> To: 'Discussion of Hardware and Software issues'
> Subject: Re: [dba-Tech] Performance in disc partitions
>
>
> IIRC, the disk controller speeds up the writes as the tracks move outwards
> towards the edge of the platter.  IOW there is more surface area on the
> outer tracks so they just bump up the waveform to allow more data to be
> written in that larger surface area.  When thought of from that 
> perspective,
> the outer tracks hold more data / track and so may require less head
> movement. I have no idea whether the first volume is on the inner tracks 
> or
> the outer tracks.
>
>
> John W. Colby
> Colby Consulting
> www.ColbyConsulting.com
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of DJK(John)
> Robinson
> Sent: Sunday, January 27, 2008 7:47 PM
> To: 'Discussion of Hardware and Software issues'
> Subject: [dba-Tech] Performance in disc partitions
>
> I am about to partition a new disc.  One partition will be very active in
> terms of reads and writes, another almost dormant.
>
> Is there any advantage in performance terms in having the active partition
> as the 'first' one on the disc?  Or the last one?
>
> It's a long time since I was involved in disc layout at a low level, and 
> I'm
> wondering whether 'cylinders' these days are still all the same size, with
> the data near the edge of the platter just more spread out than that near
> the spindle - or not?
>
> TIA
> John
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.13/1246 - Release Date: 
> 27.01.2008 18:39
>
> 




More information about the dba-Tech mailing list