Next under discussion for performance is array groups.
First the background (and as usual, apologies to those who already know all this). HDS enterprise arrays lay their disks out in array groups, either RAID-1/0, RAID-5 and RAID-6. Variable size LUNs are then carved out of the array groups for presentation to hosts. Obviously it [...]
Stephen commented about Tuning Manager and doing something useful with the data. I thought I would use this as an opportunity to highlight some of the things I look at on a regular basis (almost daily, including today in fact). Part I – Write Pending.
First a little bit of background; Write Pending [...]
I’ve been working with the HiCommand Tuning Manager CLI over the last few days in order to get more performance information on 9900 arrays. Tuning Manager (5.1 in my case) just doesn’t let me present data in a format I find useful, and I suppose that’s not really surprising as, unless you’re going to add [...]
Implementing a storage tiering strategy is a big thing these days. Everyone should do it. If you don’t then you’re not a “proper” storage administrator. Being serious and moving away from the hype for a second, there is a lot of sense in implementing tiering. It comes down to 1 thing – cost. If disk [...]
I had a bit of banter following a post I made on ITToolbox earlier in the week. The question was posed as to why major disk array vendors (other than Netapp) don’t produce performance statistics. There are benchmarks; the Standard Performance Evaluation Corporation and Storage Performance Council for instance. However SPEC [...]
I’ve done some more work on iSCSI. That meant rebuilding one of my iSCSI client environments as I totalled it by trying to add another drive to the VM guest. Anyway, panic over. I’ve got the client working again and I’ve been running traces to see how easy it is to locate relevant data in [...]
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