Currently viewing the tag: "performance"
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VAAI Posturing

By On September 21, 2011 · 9 Comments · In Storage

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 [...]

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Enterprise Computing: The Exchange Storage Bandwagon

By On May 26, 2010 · 5 Comments · In Featured

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) [...]

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How Many IOPS?

By On September 2, 2008 · 13 Comments · In Uncategorized

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 [...]

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The Defrag Debate

By On July 21, 2008 · 1 Comment · In Uncategorized

I was asked again this week whether defragging of hard drives on Windows servers is really necessary. This is quite pertinent as the cost of deploying an enterprise-wide defrag tool can be significant and any opportunity to save money has to be a good one.

I discussed fragmentation last year (here) when [...]

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SPC

By On October 3, 2007 · 3 Comments · In Uncategorized

According to Wikipedia, lightning can travel at a speed of 100,000 MPH, however I think storage vendors are even faster than lightning when it comes to highlighting or dissing the competition.

Mere microseconds after reading Claus Mikkelsen’s blog on the USP-V SPC figures, there are posts from [...]

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PSSST….Green Storage

By On September 24, 2007 · Leave a Comment · In Uncategorized

HDS announced today a few amendments to the AMS/WMS range. The most interesting is the apparent ability to power down drives which are not in use a-la-Copan.

According to the press release above, the drives can be powered down by the user as necessary, which presents some interesting questions. Firstly, I guess [...]

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NTFS Update

By On September 24, 2007 · 5 Comments · In Uncategorized

I did some more work on my NTFS issue on Friday. As previously mentioned, I was seeing NTFS filesystems with large levels of fragmentation even after drives were compressed.

The answer turns out to be quite simple; Windows doesn’t consolidate the free space blocks which accumulate as files are created and deleted. So, as a [...]

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Pause for Thoughtput

By On September 15, 2007 · 2 Comments · In Uncategorized

I’ve just read a couple of Gary O’s postings over at Thoughtput, the blog from Gear6.

In his article “Feeding the Virtual Machines”, he discussed NAS and SAN deployment for a virtual environment and makes the bold claim:

“Most people tend to agree that NAS is easier [...]

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DMX-4 Green or not?

By On July 20, 2007 · 2 Comments · In Uncategorized

After the recent EMC announcements on DMX-4, I promised I would look at the question of whether the new DMX-4 is really as green as it claims to be. I did some research and the results are quite interesting.

Firstly we need to set the boundaries. One of the hardest part of comparing [...]

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Performance Part V

By On July 17, 2007 · 1 Comment · In Uncategorized

Here’s the last of the performance measurements for now.

Logical Disk Performance – monitoring of LDEVs. There are three main groups Tuning Manager can monitor; IOPS, throughput (transfer) and response time. The first two are specific to particular environments and the levels for those should be set to local array performance based on historical measurement [...]

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