Archive for the 'Platforms' Category

5EE – is anyone actually using this RAID level? …

Wednesday, September 28th, 2011

Several years ago Adaptec adopted the 5EE RAID level as a standard component of our hardware RAID cards. It seemed like a very good idea – making use of the idle drive that was traditionally a hot spare. However, as I’ve come to know this RAID level better, I’ve been advising people against using it [...]

Measuring performance (in the modern server world) …

Wednesday, September 28th, 2011

In days gone by measuring performance was easy – Mb/sec (megabytes per second) was all anyone was really interested in. However measuring performance this way is only suited to systems where you are pushing large amounts of data through the system, not for measuring database or cloud-computing type environments. For database we measure performance in [...]

Changing the default task priority …

Tuesday, August 16th, 2011

Have you ever wondered why rebuilds take so long. Maybe it’s because you have 24 x 3tb drives in a RAID6 with 2 failed drives, or maybe it’s because the default task priority is set to low. You can set the default priority by right-clicking on the controller in ASM and changing the value. Note [...]

You did what with a mirror?

Thursday, August 11th, 2011

In days gone by if someone mixed a SAS (fast) drive with a SATA (slow) drive in a mirror us tech guys would generally smile to ourselves, pat the customer comfortingly on the head and make for the nearest exit as quickly as possible muttering under our breath. It did not make sense to mix [...]

Which drive to use?

Thursday, August 11th, 2011

Question to the Storage Advisors: We are setting up a small RAID6 on a dedicated server with 5 drives initially (it may be expanded later). The array will store mostly video content and will serve a maximum of 2-3 clients at the same time, reading those videos for playback/editing. The question is what disks to [...]

What the spare?

Thursday, August 11th, 2011

Had a question the other day from a customer panicking about his hot spare situation. He was running a RAID 1E on 3 drives with a hot spare in a small database server – very sensible. As is the way of hard drives, one went west. The hot spare did its thing and kicked in. [...]

This is going to have someone trembling …

Thursday, August 11th, 2011

In their boots that is. I’m talking about USB3. This new technology must have the tape drive vendors of the world a little concerned about the viability of people using tape drives. Of course libraries are still going to be viable due to their massive scalability, and some small buisness servers will still need multi-terabyte [...]

Thinking Broadband …

Thursday, August 11th, 2011

All the hype in Australia at the moment is the National Broadband Network … basically fibre to the node everywhere (fibre to all homes and businesses). Now no-one believes it’s going to happen in the next 6 months but the current government has a firm commitment to get this going. So what implications will that [...]

There has to be a better way …

Thursday, August 11th, 2011

I, like many of the people who work in this industry, am “the guy who knows about computers” to my friends and family. This means I get the job of cleaning viruses, reinstalling Windows, and much more sadly, trying to recover lost data – mainly family photos – cherished items gone into the ether with [...]

The perils of quick init …

Thursday, August 11th, 2011

The perils of quick init … When building an array using Adaptec RAID cards (hardware RAID 5 that is), you have various build options … clear, build/verify, quick init and (on newer firmwares) skip init. These options give you choices in how you build your RAID 5 array. While choice is good, and the marketing [...]