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I got notification today about the new disks available for the USP et al.

I thought it interesting that there were a couple of things that might need comment.

Flonase For Sale, Even though it was not really suggested, the notificaiton said:

<qoute>

.... due to the large capacity and the proportionally longer rebuild time for these drives, a RAID-6 configuration provides additional protection against possible data loss in the event of a second drive failure during the longer rebuild time of the first failure. 

</quote>

I like the idea that someone actually says it is a good idea as so far, no one is really pushing that.  Also considering our double disk failure in one parity group, it is something to think about. 

Now comes the hard bit.  As the drives get bigger, the IOPS stay much the same.  I would expect that the 15k 300 GB drives would have similiar IOPS to the 15k 146 GB drives and you would have to consider that if you wanted to go that path.  It also leads me to something I read that states:

Each Array Control Pair (ACP) on the Universal Storage Platform can support 15,500 IOPS.  Thats about one third of the IOPS the actual disks can produce.

I was lucky to have done a lot of maths with my Computer Science degree and if we are to use all those recommendations about such and such a configuration, I might actually be able to use what I learnt.  I will have to dust off my calculator and probably replace its batteries.  I can hardly wait until we can only get minimum 500 GB drives that spit out 100 IOPS max.  Then the ACP's will have enough back end disks to just cope.

Actually I am happy to use the 300 GB 15k drives if they are priced well and HDS drop the licencing costs per TB.  I wanted HDS to provide 500 GB SATA disks for the USP so I could provide cheaper backup devices to our servers.  EMC can now do it..  Its all about getting the right solution for the right price.

Stephen

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3 Responses

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  1. Open Systems guy says

    Have you ever seen any numbers about what an EMC controller can put through? I’ve never benchmarked them or seen any benchmarks…

  2. Barry Whyte says

    Another interesting statistic about the USP/V is what they claim for external virtualization IO/s – USP 9K  and USP-V 12KIt does not clarify if this is per controller, per port, or more likely per port pair as above. But still, its not very much.In general I agree with your point about increased capacity with no increase in IOPS. As you say its a trade off between capacity requirements and IOPS performance requirements. If IOPS performance is they goal, many more 36GB or 72GB 15K is still the best option! (I say IOPS performance as the increased number of heads / platters in the larger capacity drives keeps the response time around the same, if not better.I discussed this regarding SATA over here :http://www-03.ibm.com/developerworks/blogs/page/storagevirtualization?entry=sata_performance

  3. Stephen2615 says

    Hey Barry,
     
     
    I don’t think I have ever seen that external virtualiastion stuff that you referenced.  I have a HDS 9585 virtualised behind each USP for backup LUN’s and I never really thought about IOPS with it.  So far the performance of those 300 GB SATA disks has been very acceptable and no one has ever complained about the backup LUN’s.  Thats probably because they don’t know any better and don’t care all that much about it because they are not there.
     
     
    I am also in the process of virtualising two DS 4800’s (one for each USP).  Its cheaper than buying the same amount of storage for the USP and I think the 4800’s perform well enough.  If I use 4 x 4 Gb ports between the USP and DS 4800 and then allocate 4 x 4 Gb ports for the front end, I would expect to see little performance issues.  I give the DS4800 a thumbs up for what it is.
     
     
    My last new purchase of a Sun 9990 (USP 1100) about a year ago was a no brainer for disk size.  We went the 146 GB 15k disks because we were told the 73 GB were going to be hard to find if we wanted to fill up the system in the future.  I was extremely impressed with its performance but I did over spec it a bit.  Better to do it now then see what happens in a years time with it doubles in size.  Besides if you have the money now, spend it…. it may not be there in the future.
     
     
    Stephen