This is Barry Whyte's Typepad Profile.
Join Typepad and start following Barry Whyte's activity
Join Now!
Already a member? Sign In
Barry Whyte
Recent Activity
How much does PowerPath cost per port?
1 reply
You've only got 4x 2 way Intel Westmere(?) CPU in your Vmax, So at about 6GB/s per DDR3 channel, and limited by the QPI on that generation, I can see about 48GB/s cache hit... at 100% memory efficiency... As for migration, its quite sad that (IBM included) the open source multi-path OS implementations work, and those you pay for don't always - with AIX we found an edge case that we want fixed before releasing full GA support - support for those other OS will be coming when they fix their problems... ;)
1 reply
Touche! I think you'll find SVC/V7000 has been true active/active since 2009. And with 6.4 we now have the ability to migrate volumes between IO groups without disruption, and the ability to present volumes through all IO groups, so true N-way access. Meanwhile, 53+GB/s miss bandwidth - thats some serious number of SAS ports (or are you still stuck on FC-AL disks) - thats a marketing number, much like 296PB HDS... whats the real miss (from disk read IOPs number) or will EMC continue to hide behind those amazing performance graphs that show no scale on the y-axis - gotta love how you get away with that:)
1 reply
"quite" is the keyword. Not seeing it come up as a real competitor in the field. Lots of "the roadmap looks good" style hype, but when bit comes to byte... Active active HA at distance, is it really that active? watch this space... Interop. Good luck with that. Learning, and real customer use are very different things as I;m sure you'd agreed. Anyway, maybe we can concentrate on differentiators, now that you've realised/agreed we had the right architecture in the first place, and for once you are playing catch up ;) Look forward to sparring in the future, been quiet out here with your absence.
1 reply
Congrats on finally seeing the light, but I guess the U turn is due to the fact that both Invista and VPlex haven't been anywhere near as successful as hope. Bundle it with the big iron and maybe someone will use it - a bit like HDS ... Anyway, good luck with that interop catchup - being first (and industry leading) does have one advantage 10+ years of interop testing you need to catch up on - unless you plan to use SVC as the gateway to your support as I've seen in the very rare case where I've come across Vplex. Barry
1 reply
Barry, Easy Tier on SVC and V7000 is driven by the pool extent size, so is configurable between 16MB and 8GB. WRT more than two tiers... the initial advantage of a function like EasyTier is its ability to make best use of SSD. That is, we have a very expensive ($/GB) medium that provides massive performance (IOP/GB) therefore the best way to use SSD is to spread the IOP over an entire enterprise. Thus EasyTier. HLM, i.e. archiving cold data, yes that useful for making use of SATA. However, if we'd all thought that the 2, 3x difference between 15K and 7.2K meant we needed tiering, wouldnt we all have implemented EasyTier, FAST or VP etc 10 years ago??? Thats not to say that multi-tiering cant help, but EasyTier is aimed at gaining benefits from SSD.
1 reply
Glad you like, and hopefully the product will speak for itself in the market without the need for Evangelistic Marketing Campaigns.... Also the back-handed complement - but there many more than me in the team that have put their heart and soul and brains into this box!
Toggle Commented Oct 8, 2010 on Wize Up at Storagebod's Blog
Well there's a shocker - you come out of hiding to post about HDS and IBM again - nothing about EMC... apart from the obviously aged and maybe its dead CX platform? Got problems there? Where's the SAS drives, wheres the 2.5" SFF drives? 4 Gbit FC-AL how quaint !!!! Ooops, hang on a minute, looks like I switched surname for a second! No issues with backend drive here thanks, just reduce test load at initial GA to ensure day1 config is 100% stable. And I think most people will find that the 240 drive system will happily out-perform a CX-4 even 960... how many actually have 960 drives, and how many of those drives can you actually saturate - even half of them? ??
1 reply
Having worked in a bookshop, the actual cost of producing the dead-tree bit is virtually ZERO. Almost all of the cost is in the publishers cut, and the royalties to the author, and the distributers. So I guess the distribution chain is the only cut out!
Toggle Commented Sep 22, 2010 on Read Only at Storagebod's Blog
I always wanted to turn off some big (previously critical) machine that has a big handle like O-B-Wan does when he shuts off the tractor beam... wooooooooommmmmm - you'd just have to make the noise... But i know what your mean, there is nothing like connecting with someone. That point in a briefing when u almost see the light come on above their head... it makes it all feel worthwhile - i had two of those this week. We could move on from Sci-fi... but maybe... some points for anyone that gets... "the chance to begin again in a golden land of opportunity and adventure" surely one of the sci-fi classics of the 80's
1 reply
Maybe the true virtualized story works too, and we have the realy why, and thats why I get asked back again and again by the briefing center - despite it not being my job! Or maybe you need a forename of Barry - lol
1 reply
So its half baked virtualization, some data movement, but wheres the actual value, when you need to still buy another expensive license for backend copy services. You won't be able to use the cache if you are going to use backend copy services, certainly not on non-EMC storage - maybe if you have some more proprietary hooks into EMC storage, but otherwise a "point in time" at the host isn't a point in time at the storage. Heard rumors that you are looking to use SVC to get storage interop, but without an SCORE/RPQ request, IBM won't support it as a host type without passing out own interop testing and validation. I was hoping for so much more, just like the marketing hype behind FAST, and we are still waiting for it to appear at the necessary sub-lun level...
Toggle Commented May 10, 2010 on 3.003: to boldly go at the storage anarchist
1 reply
So I think your understanding of the USP is correct. Backup mode means the cache keeps going on battery - as if nothing were wrong. The destage mode is a kind of flush-thru mode when on battery, but worrying that you can't do that with external storage attached?! Also from experience if you don't power down the box correctly, then it keeps running off the battery even although it looks like its powered off. If you also leave the system in that state and the batteries do run for the 24-48 hours, you need to replace them completely! Thats what happened to our USP when we had a power down weekend in the lab!
1 reply
Barry Whyte is now following The Typepad Team
Feb 12, 2010