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Forum Discussion
shingled magnetic recording (SMR) hard drive fiasco - inquiring on recommendations
It's been a while since I jumped on the forum but what brings me here is my NAS volume utilization is hovering around 65%. I believe it's good until 80% and then starts to bark at you about storage ...
NASguru wrote:
That all said, I saw a few articles stating that WD 2-6TB are SMR while the 8TB and above are CMR.
WD has said that, so I am thinking that applies to the WD20EFAX, WD40EFAX and the WD60EFAX. Synology shows the WD20EFAX and the WD60EFAX as SMR, but doesn't list the WD40EFAX at all.
NASguru wrote:
I believe CMR is essentially the same as PMR but dont' hold me to it.
CMR is just another name for PMR.
NASguru wrote:
I'm looking at some WD Reds on Amazon and was wondering if anyone has some experience with their 8TB and above RED HDs and can confirm they are CMR.
It's not that easy to tell. If I'm understanding what I'm reading correctly, they use soft mapping to physical sectors (similar to an SSD). And they remap updated sectors into the large cache, and don't necessarily re-write the SMR sections of the disk right away. Basically they have improved SMRs somewhat over the years.
That said, I am running two WD100EFAX drives in my main NAS, and am not seeing any issues with general write speed, scrub times, or balance times. I have four WD80EFZX running in a backup NAS, but no WD80EFAX drives..
So timing is everything, when did you buy your WD100EFAX? From what I read, they started inserting SMR drives into the red NAS line around early 2017. Therefore, it's possible you didn't get a drive using SMR depending on when you purchased it. The WD101EFAX also seems to be the replacement for it but both can still be purchased off Amazon with the WD101EFAX being about $10 more. I was also under the impression you can run read/write programs such as CrystalDiskMark to determine if the drive can write 100+MB/s. Most seem to agree that the SMR drives fall off to around 30MB/s which is the give away. I suppose droping a 30GB file onto the drive would accomplished similar results. I seen some who mentioned the ONLY way to determine is to call WD support and provide them a serial #. I could always order the drives and upon receipt call them to verify. Alternatively and if I trust WD to be honest I could just spend an extra $50-$60 per drive and get the pro version which are supposedly all CMR but then again why overpay if it's not necessary. The other method of verification I saw was to open/destroy the drive and count platters but who has money to burn and even then it's no gurantee the next one will be the same. Anyhow, rant over but was I was hoping for a simple black/white yes/no answer but alas it's a gamble either way.
NASguru wrote:
So timing is everything, when did you buy your WD100EFAX?
April/May 2019
NASguru wrote:
I was also under the impression you can run read/write programs such as CrystalDiskMark to determine if the drive can write 100+MB/s.
Not 100% sure on that. Sequential writes from beginning to the end of the disk could run at near-normal speed. And with soft sector mapping there are a lot of tricks you could play in theory, especially if part of the drive is CMR.
In any event, I did run a full erase on both drives before I added them to the NAS. While I didn't closely monitor the times, I believe it was approximately 24 hours for each (which is ~115 MB/s for 10 TB).
I also have the resilver time in an old log zip.
data resilver 2019-04-28 09:54:41 2019-04-29 17:46:39 completed
This resilvered the first inserted WD100EFAX, and completed in ~32 hours. 6 TB on the WD100EFAX would have been written, and 18 TB of data would have been read on the other three drives (all WD60EFRX). Plus the NAS was in use during the resync.
I haven't noticed any slowdown in performance on sustained writes since they were installed.
NASguru wrote:
if I trust WD to be honest
Seagate is known to have silently slipped SMR into some desktop drives. Though they don't recommend those disks for RAID, I still think that's a breach of trust.
Of course WD has now confessed that they did silently slip SMR into the 2-6 TB Red Drives. But in that confession they explicitly stated that larger Red drives (8 TB and up) used CMR. It's one thing for a company to be silent. It's another to make a false statement.
Personally I'd take WD at their word on the currently shipping drives. Honestly I don't know if I trust them to disclose SMR in new drives they introduce in the future. Their disclosure didn't include an apology or any promise of transparency in the future - instead they just asserted that their SMR Reds are fit for their purpose - which is quite debatable.
Hopefully there will be a lesson learned here for both Seagate and WD. I'll be looking for explicit statements on SMR, CMR (or HAMR) on future models I purchase.
I ran across this: https://www.youtube.com/watch?v=KWYnM58C1ro
Might be worth following, as he is planning some testing of these drives in RAID.
I saw someone mention weighing them to see if it has fewer platters. I don't know about that, the platters are pretty light. But that means you have to buy it first, too.
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