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: P�tur Ey��rsson [SMTP:[EMAIL PROTECTED]] > Sent: Wednesday, February 13, 2002 11:05 AM > To: [EMAIL PROTECTED] > 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 > > [EMAIL PROTECTED] > > Nyherji Hf Simi TEL: +354-569-7700 > Borgartun 37 105 Iceland > URL: http://www.nyherji.is > > > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of > Kelly Lipp > Sent: 13. febr�ar 2002 16:33 > To: [EMAIL PROTECTED] > 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 > [EMAIL PROTECTED] or [EMAIL PROTECTED] > www.storsol.com or www.storserver.com > (719)531-5926 > Fax: (240)539-7175 > > > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of > Pitur Ey~srsson > Sent: Wednesday, February 13, 2002 6:32 AM > To: [EMAIL PROTECTED] > 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 > > [EMAIL PROTECTED] > > Nyherji Hf Simi TEL: +354-569-7700 > Borgartun 37 105 Iceland > URL: http://www.nyherji.is
