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Tag Archives: performance

Storage QoS – How Hard Can It Be?

Following up from yesterday’s post and the comments received, I thought it was worth considering how hard it would actually be to implement quality of service within a storage array. Almost all storage arrays available today (whether physical or virtual) work on the assumption that I/O should be delivered as fast as possible.  This is not an unreasonable premise, especially ... Read More »

Storage QoS In The Cloud

Last year I did some research and wrote up a couple of posts on Cloud Compute performance.  One feature that seems to get left out somewhat is storage I/O performance; the cloud offerings talk about capacity, but rarely reference performance. Recently, I reviewed the options available from the major providers and found two new storage performance offerings. AWS (Amazon Web ... Read More »

Optimising Storage Architectures for SSD

Last week I attended Hitachi’s 2012 Blogger Day.  Aside from catching up with some old friends, we were presented with some NDA stuff which will see the light of day soon.  In the meantime, I want to talk about a press release Hitachi made while I was still on holiday (and clearly missed as I returned, somewhat jetlagged). Previously I’ve ... Read More »

VAAI Posturing

With yet another HDS/VAAI post coming out from Scott Lowe (here), the irrelevant debate continues as to who is in and who is out of VMware’s inner circle of trusted storage vendors.  Previously my friend Stephen Foskett discussed HDS’s position regarding VMware integration in this post, which followed on from an original post by Chris Mellor (who I hope would ... Read More »

Enterprise Computing: The Exchange Storage Bandwagon

I love the late evening banter on Twitter, where a conversation between a number of individuals turns into a personal rant from yours truly.  Tonight’s subject – performance management of Microsoft Exchange and overconfiguration of storage for email. Some 4 years ago, I was working for a large investment bank (which may now be defunct) and I did the storage ... Read More »

How Many IOPS?

A question I get asked occasionally is; “How many IOPS can my RAID group sustain?” in relation to Enterprise class arrays. Obviously the first question is to determine what the data profile is, however if it isn’t known, then assume the I/O will be 100% random. If all the I/O is random, then each I/O request will require a seek ... Read More »