Partial SRDF/Metro 3-site with SRM (SRA)

I recently ran across a customer configuration I had not seen before with 3-site SRDF/Metro (ASYNC leg with failovertoasync site set in Global XML), and it gave me some concern. Let me talk about the setup and then cover the concerning aspects. I will say from the outset, I actually didn't think this setup was... Continue Reading →

NVMe/TCP and SRDF (with VMware)

I'm not sure this topic requires a full post, but if you don't work with NVMeoF technology much, you may assume that it is just a different way to connect to your storage and everything else functions pretty much the same as it does with FC/iSCSI connectivity. Spoiler - it doesn't. Here I am interested... Continue Reading →

SRDF SRA 10.0

Along with the new PowerMax as expected we have a new SRA release, version 10.0. The primary feature of the release is to support Solutions Enabler 10.0 and the new platform - PowerMax 2500/8500. But there are a few items to discuss concerning the release, one a new requirement, the second a bug fix which... Continue Reading →

Consistent LUN ID

Here's one of those old issues that seems to keep coming up - consistent LUN IDs with VMware. As this discussion has been around since VMware introduced vMotion, I'll be brief with the history. I'm going to just talk about LUN IDs from the VMware side here. On the PowerMax you can use something called... Continue Reading →

SRM 8.5

SRM 8.5 was released a couple days ago now (10.5.21) and offers some interesting additions. At the top I'll note that our SRDF SRA 9.2.x is compatible with SRM 8.5. For many point releases, VMware does not significantly alter how SRM works and thus simply brings certification forward from the previous release. Since we support... Continue Reading →

SRDF/Metro Smart DR

One of the new features we released with the latest PowerMaxOS is known as SRDF/Metro Smart DR, or MetroDR for short. MetroDR expands the previous functionality of a third leg off the R1 or R2 of an SRDF/Metro pair by allowing either the R1 or R2 to update the third leg. In essence this is... Continue Reading →

KB on 3-site SRDF/Metro Cascaded with SRM

I've been helping out development with some future configuration scenarios with SRM and the SRDF SRA and came across a behavior that could cause customers a problem running a 3-site SRDF/Metro cascaded setup. Funny thing is, the behavior of our array code which brings about the issue has been around for at least 2 PowerMaxOS... Continue Reading →

Non-Disruptive Migration (NDM) with VMware

Non-Disruptive Migration, or NDM, is a capability offered on our arrays that allows you to move from an older array to a newer array with no downtime (hence non-disruptive). NDM has been around for years at this point, but I see it infrequently in VMware environments because of the use of VMware's own NDM, Storage... Continue Reading →

SRDF SRA TechBook 9.1

I published the latest SRDF SRA TechBook version 9.1 today. You can get it here. A reminder that this TechBook only covers SRA 9.x. Prior SRA versions are in the original TB which is located in the documentation library. Besides the changes for 9.1, I added some sections which I have covered in this blog... Continue Reading →

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