Disk Speed and Tier 1 vs Tier 2

Question

Hi ,

I have disks on a DMX-3 showing the model number as C146LDF. How can i find out what is the speed of disk drive?

And We normally consider these as Tier1 disks and what about tier2 disks?
Are all 300GB disks are of Tier-2 type? how actually this bifercation happens?

Thanks
Ajay

bodnarg · Answer

I had asked this question a while back - follow the link for some good suggestions on getting the drive speed:

https://forums.emc.com/forums/thread.jspa?threadID=59112

As for tiers - that is a tough one to answer. It really boils down to how you config the drives and what you expect in Tier 1 vs Tier 2 storage. Is it purely performance or do you expect Tier 1 is offsite replicated? These terms can mean different things to different people. It really boils down to how you want to split and if you have SLAs that determine what each will provide.

You can certainly use 300GB drives in a Tier 1 configuration if they provide the performance you need. This is especially true if you use regular old mirroring instead of Raid-5/Raid-6 configurations.

This chain will probably spark off something akin to a religious debate

AJK3 · Answer

Ok I found that the disk model is SX3146707FC and it looks its a 10K drive. If we consider this as Tier-1 and now I have 300GB with 15K RPM. And on the basis of performance, Can these 300GB disks be considered as Tier-1 and my EMC quote shows . . Tier2 storage...

bodnarg · Answer

Any comments showing Tier1 vs Tier2 were most likely added by your EMC sales team. There is nothing I am aware that would have EMC flag drives in their inventory as Tier 1 or Tier 2.

If you have 300GB drives running at 15K speeds they are certainly more than capable of handling "Tier 1" workload especially in a mirrored configuration. You need to talk to your sales team and see why they flagged as Tier 2. Probably just a lazy cut-and-paste mistake on their part.

Remember it really boils down to what you expect performance wise and what applications you are going to run on those drives. A 15K drive will be able to handle more IOPs than a 10K drive - the difference in density obviously dictates how many different things could contribute to those IOP counts.

AJK3 · Answer

Thanks Bodnarg.

I am even comparing them with seagate specs and 300GB looks good.

http://www.seagate.com/ww/v/index.jsp?vgnextoid=dbf7a3b7b59ad010VgnVCM100000dd04090aRCRD&locale=en-US&reqPage=Model&modelReqTab=TechSpecs

Symmetrix

Disk Speed and Tier 1 vs Tier 2

Was this post helpful?