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* Posts by lyceus

6 posts • joined 24 Jan 2011

Ten exabytes wedged into a rather large box by Cleversafe

lyceus
Paris Hilton

back of napkin calculations

10 exabytes is enough storage for around 500,000 years worth of HD (5Mb/s) video. That's a lot of pr0n.

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TfL wheels out digital bus info upgrade

lyceus
Go

Now that is a good idea!

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Off-the-shelf servers spar with million-dollar storage arrays

lyceus

Well read - not

Perhaps Chad should re-read the quote from Nexenta's CEO? It doesn't say that Nexenta handled 50% of the load, it says "50% of the verticals". A very cleverly written post that seems to say one thing but actually doesn't!

Marketing at it's very finest.

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So what can't you do with VMware's VSA?

lyceus

Other VSA options...

Why would anyone choose this over HP's P4000 VSA, which has a list price of around $5000, and does support iSCSI? Plus has a bunch of additional features not present in any respect in the VMware VSA?

Unless VMware expect customers to pay a premium for being able to manage the VSA within vCenter (?)...

I would also expect SMBs to consider OpenFiler with a support package, which is even better value, and has even more features too...

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Seagate's terabyte platters make it the densest of the lot

lyceus

... should be the same

Seek time should be the same - it is defined by the rotational speed of the drive, the diameter of the platter, and the speed of the actuator motor (plus a few other minor things). Since all these factors will be the same, the seek time will be the same (give or take a tenth of a millisecond).

What may change is the peak/average read/write speeds. That depends on the areal density and the number of platters/heads.

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The cost of not deduping

lyceus
FAIL

De-dupe is done at block level

De-duplication is a great tool for eliminating the storage cost for exact copies of files. However, as soon as the content is changed in typical office files, they cannot be de-duplicated at the block level. For example, a Word document that has had one character changed somewhere in it will add an "edited by" tag at the top of the document, thereby "pushing" all the content down a few bytes, and therefore all the blocks will not match up for de-dupe.

God help anyone who believes they can achieve anything over 15% storage reduction in a typical environment. The exception might be a large Exchange 2010 installation.

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