Category Archive: RAID

Feb 24

Day-4 (Mac Experiment)

So I’m trying a disk upgrade.  One of the spare 250G drives I threw into the Mac when I got it failed (Lower-bay, which I’m assuming was disk-2 of 2) so I decided I would try my hand at upgrading the disk. I realized that the 250G drives i put in there won’t be enough …

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Feb 23

Day-3 (Mac Experiment)

My definition of “Day” changes…well…daily. I’m having to do some shuffling of data off my old PC Workstation and I found something interesting. MacOS can’t WRITE to an NTFS volume without a third-party driver.  It can read from it just fine. I ran into a situation where I had to consolidate data from 2x 2TB …

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Jul 09

Storage Tiering…

Ok, given the changes to the storage arena I’ve been working on a revised “Tiering system” to incorporate all of the levels of data…importance? My version of Storage Tiering is (or should be) as follows: Tier-1    – Symmetrix/Replicated – High Performance/Criticial Data Tier-2    – Symmetrix/NonReplicated – High Performance/Non-Criticial Data Tier-3   – Symmetrix/SATA/Replicated – High-Medium Performance/Critical …

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Sep 26

The Different Flavors of EMC TimeFinder

I don’t know what most people know about TimeFinder, so I’ll start with a short introduction. EMC Timefinder was developed to provide customers with a dynamic mirror they could use to try and cut some of the tediousness out of copying data, whether from one host to another or within the same host. When I …

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Sep 22

For the last time – Raid-S does not mean “STRIPED”

RAID-S isn’t striped.  If it were it would be Raid-5. EMC utilized Raid-S as a stop-gap to the fact that they didn’t offer Raid5. (the constant XOR computations slowed down performance – until the faster DMX line came up which now allows for both 3+1 and 7+1 raid5. Raid-S takes three volumesand computes a parity …

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