Feeds

Defragger salesman frags HP

'You need my stuff, don't listen to them,' shouts man

Beginner's guide to SSL certificates

Defrag software supplier Diskeeper has denounced HP for failing to mention fragmentation issues.

Mandeep Birdi, a technical presales consultant at Diskeeper Corp Europe, said: "It's unfortunately becoming a little too common for me to hear from many customers who are adding SANs to their network estate, that their SAN vendor has either told them not to worry about fragmentation, or didn't even mention it as a possible problem."

That did not endear him to HP, which was keen to correct any misapprehensions here.

HP's response

HP contributed this statement:

Firstly, fragmentation is not an issue for the Enterprise Virtual Array (EVA) and HP simply would not be "forgetting" to inform our customers if there was one.

A fundamental pillar of the EVA's virtualisation capabilities is the equal distribution of data blocks across all disk drives in a disk group to provide equal access time for random I/O patterns – which typically can be found in fragmented file systems.

A defragmentation application, such as the one your message referenced, provides a contiguous file reappearance to previously fragmented file systems.

There is no fragmentation issue for the EVA at all

This works well with the EVA platform – just as with other platforms or LUNs in general. Under certain I/O patterns, especially sequential read operations (often appearing with backups), the EVA's read-ahead caching algorithms support a significantly increased I/O performance.

These read-ahead algorithms predict the next disk blocks the server is likely to access based on past access patterns and loads them into cache without having to re-position the MR head. This becomes even quicker when the next data block is adjacent to the previous one – ie, the exact target of a defragmenter.

Over time and depending on the I/O patterns and the operating system, data "containers" will show fragmentation. For sequential data accesses, defragmentation can help to increase performance – especially when combined with sophisticated techniques that the EVA provides.

Also, it is important to note that fragmentation is not caused by the underlying storage system but by the operating systems utilising it. The single HDD used with Windows OS in PCs is a perfect example of it.

In other words, due to the underlying inherent EVA virtualisation, EVA supports equally fast access times for random I/O patterns. Which is not something "traditional" arrays can provide easily. And secondly, for less fragmented environments, the EVA caching mechanisms further increase the I/O performance.

We do want to make it clear that there is no fragmentation issue for the EVA at all and neither do we "fail to mention" it to customers.

So there.

The defrag topic was recently discussed in further detail here.

Some might think that for minnow Diskeeper to accuse a large vendor like HP of misleading customers when there isn't really an issue is a cheap shot aimed at trying to generate free publicity for a product. We couldn't possibly comment... ®

Security for virtualized datacentres

More from The Register

next story
It's Big, it's Blue... it's simply FABLESS! IBM's chip-free future
Or why the reversal of globalisation ain't gonna 'appen
'Hmm, why CAN'T I run a water pipe through that rack of media servers?'
Leaving Las Vegas for Armenia kludging and Dubai dune bashing
Microsoft and Dell’s cloud in a box: Instant Azure for the data centre
A less painful way to run Microsoft’s private cloud
Facebook slurps 'paste sites' for STOLEN passwords, sprinkles on hash and salt
Zuck's ad empire DOESN'T see details in plain text. Phew!
CAGE MATCH: Microsoft, Dell open co-located bit barns in Oz
Whole new species of XaaS spawning in the antipodes
AWS pulls desktop-as-a-service from the PC
Support for PCoIP protocol means zero clients can run cloudy desktops
prev story

Whitepapers

Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.