Smart Polling Delay

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TAC

Member
Sep 28, 2020
6
0
What is the Smart Polling Delay measurement all about? I have 3 4TB drives in my computer and I get the following readings for Smart Polling Delay.
Western Digital: 8.741
1st HGST: 6.242
2nd HGST: 599.969
 
It's another "thing" that SpinRite benchmarks (because it can). When software asks a drive to return its current "SMART" status, that's a request of the drive like many others. As you can see from your examples, the length of time a drive requires to reply can vary widely. It's not a crucial parameter for a drive, but SpinRite shows it because it can. The rate of SpinRite's polling for a drive's SMART status is adaptive so that not too much time is consumed during its use. If a drive is inordinately slow to respond, as is that 2nd HGST drive, then SpinRite will poll the drive less frequently so that less time is spent not transferring data and getting other work done. So SpinRite is measuring that anyway and I decided to show the user. (y)
 
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Ok I won't loose any sleep over it. :D

Kind of strange two HGST drives vary so much. The faster drive is a HDN724040ALE640 and the slow is a HDN726040ALE614.
 
"S.M.A.R.T." is anything but what its acronym implies! I have a 14 TB Seagate drive in my computer that I almost returned immediately after I put it to use because of certain "S.M.A.R.T." numbers it was showing me. They made me think the drive was failing. However, after doing some investigation on what those numbers mean, I realized they were nothing to be alarmed about. That is just how Seagate does it. Three years on now, and the drive is doing just fine.

The bottom line appears to be that "S.M.A.R.T." data is often meaningless to the layperson. Unless you know how the drive manufacturer is using it, don't jump to conclusions. There may be no need for alarm.
 
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What are the units of measurement?
It's in seconds with a lot of decimals. And, yes, that makes me quite suspicious about that 2nd HGST drive, too, since 599.969 is obviously 600 seconds—which is ten minutes—which looks suspiciously like a timeout, either by SpinRite or by the drive. I was going to ask @TAC for the model number of the drive since I'd be glad to obtain one to see what's up with it.
 
2nd HGST: 599.969
@TAC : Could you share the model number of that 2nd HGST drive? While the benchmark was running, compared with the other drives did that SMART Polling Delay phase just crawl along? One thing you could do, which some of our testers were doing to clarify behavior questions, was to make a short video with your phone, post it to YouTube, then post the link here. Thanks!!
 
It's in seconds with a lot of decimals. And, yes, that makes me quite suspicious about that 2nd HGST drive, too, since 599.969 is obviously 600 seconds—which is ten minutes—which looks suspiciously like a timeout, either by SpinRite or by the drive. I was going to ask @TAC for the model number of the drive since I'd be glad to obtain one to see what's up with it.
It's milliseconds, not seconds. Here's a snippet from one of my logs:

Code:
  |==========================================================================|
  |                          Performance Benchmarks                          |
  |--------------------------------------------------------------------------|
  |                    smart polling delay:  16.662 msec                     |
  |                    random sectors time:  11.965 msec                     |
  |                    front of drive rate: 267.154 MB/s                     |
  |                    midpoint drive rate: 240.226 MB/s                     |
  |                      end of drive rate: 127.704 MB/s                     |
  |==========================================================================|