ADSM-L

Re: TSM and RAID on NT

2002-02-13 12:25:33
Subject: Re: TSM and RAID on NT
From: "Coats, Jack" <Jack.Coats AT BANKSTERLING DOT COM>
Date: Wed, 13 Feb 2002 11:22:01 -0600
JBOD - Just a Bunch Of Disk - sometimes used to put behind a hardware
raid controller, and sometimes uses with software raid (like Veritas file
system).

Rather than putting any file system on them on them, TSM can use raw disks
in a JBOD
and gets very good performance.  I don't know if it will use raw devices
under
NT, but on Sun it is much better than using even the same disks with a file
system of any kind over them.   

> -----Original Message-----
> From: Pétur Eyþórsson [SMTP:peddi AT ITN DOT IS]
> Sent: Wednesday, February 13, 2002 11:05 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: TSM and RAID on NT
> 
> Thanks Kelly.
> 
> But what is JBOD?
> 
> My Hardware guys say that on Application Servers, they get best perfomance
> when setting the stripe size to 16K instead of 8K default (witch is ideal
> for File & Print Servers)
> 
> thanks in advance
> 
> Kvedja/Regards
> Petur Eythorsson
> Taeknimadur/Technician
> IBM Certified Specialist - AIX
> Tivoli Storage Manager Certified Professional
> Microsoft Certified System Engineer
> 
> peddi AT itn DOT is
> 
>  Nyherji Hf              Simi TEL: +354-569-7700
>  Borgartun 37            105 Iceland
>  URL:                    http://www.nyherji.is
> 
> 
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Kelly Lipp
> Sent: 13. febrúar 2002 16:33
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: TSM and RAID on NT
> 
> 
> Now that's a very good question.  During my LTO vs. SDLT performance
> testing, I discovered my first bottleneck at the RAID5 array. I was
> surprised by this to some extent as I didn't expect it to be so bad.  So
> enter RAID for storage pools cautiously.  We are using RAID in our
> configurations, but only for the OS and DB/Log volumes.  We're using JBOD
> for storage pool volumes.
> 
> As for your specific questions, I don't have the answer.  Remember that
> TSM
> is going to "stripe" data on the volumes: a client will write txngroupmax
> files per volume and move to the next (typically.  This may vary a bit,
> but
> you get the idea).  Since it is striping the data, you want to be careful
> how much you stripe it underneath.  Lots of head thrashing can occur.
> 
> Kelly J. Lipp
> Storage Solutions Specialists, Inc.
> PO Box 51313
> Colorado Springs, CO 80949
> lipp AT storsol DOT com or kelly.lipp AT storserver DOT com
> www.storsol.com or www.storserver.com
> (719)531-5926
> Fax: (240)539-7175
> 
> 
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Pitur Ey~srsson
> Sent: Wednesday, February 13, 2002 6:32 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: TSM and RAID on NT
> 
> 
> Hi what is the best RAID for TSM on NT
> and how large should the Stripe Size be on the RAID CONTROLER.
> 
> 
> 
> 
> 
> Kvedja/Regards
> Petur Eythorsson
> Taeknimadur/Technician
> IBM Certified Specialist - AIX
> Tivoli Storage Manager Certified Professional
> Microsoft Certified System Engineer
> 
> peddi AT itn DOT is
> 
>  Nyherji Hf              Simi TEL: +354-569-7700
>  Borgartun 37            105 Iceland
>  URL:                    http://www.nyherji.is
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