Also, NAS units and RAID arrays are designed to continue serving applications and users when in degraded states. Would be very unhappy if I had gotten SMR drives though. Great to see some hard facts related to this after reading about it from others. Shucking external drives (which are often SMR) is mentioned on both pages. This is a significant workload, but we wanted to stress the drives to ensure we could get separation. Period! WD Red SMR vs CMR Tested Avoid Red SMR | Page 2 of 2 | ServeTheHome. Even after it came out we thought the experiment worthwhile since the number of users that read the iXsystems blog is likely a minority, even among STH readers. From the brief I now know the 3TB drives I bought for my Synology are CMR. With all the recent controversy regarding WD, Toshiba, and Seagate slipping SMR drives into retail channels and failing to disclose the use of their slower technology, we thought it would be interesting to dive into the actual impact of using a SMR drive. CMR. If you would like to publish or reproduce any part of this article on the other Internet recourses you would have to get an agreement signed by the author of this article. •Western Digital WD20EZRZ Caviar blue. A resilver or RAID rebuild involves an enormous amount of data being read and written, and has the potential to be heavily impacted by the performance penalties of SMR technology. So they go way into the weeds of commands (that the average QNAP, Synology, Dobo user has no clue about) then say it’s fine… oh but for ZFS its still sucks. But the question for me (as somebody who is about to buy a new NAS as a media hub for Videos and Photos) I still have two old st4000dm005 lying around and would use them and upgrade two additional a cheap 8TB (SMR – st8000dm004) or with the whole SMR NAS drive debate, a very expensive CMR Ironwolf or something like that ? Good analysis. Many of our readers may already be familiar with the differences between SMR and CMR, but a quick refresher never hurt anyone! If we’d said 10 days, someone could come along and say we were exaggerating the issue. To be crystal clear, I knew what SMR was, and that the drive used it. There @Patrick is saying how much he loves WD Red (CMR) drives while using this to show why he doesn’t like the SMR drives. Any chance anyone has a link to that? WD20EZAZ: 2TB Blue: DM-SMR (4), EZRZ is CMR: WD - … It is called shingled because the data tracks can be visualized like roofing shingles; they partially overlap each other. Shingled Magnetic Recording (SMR) technology helps hard drive manufacturers to produce HDDs with larger capacity. It takes balls to do it but know I appreciate it. This article has been written exclusively for hddscan.com Robert – I generally look for low-cost CMR drives, and expect that they will fail on me. You don’t test a drive before putting it into a rebuild scenario? perhaps hardware raid or Linux mdadm etc, instead of just ZFS. 2 Jan, 8:39 am. But, selling SMR as a NAS drive, AND not clearly labeling it, (like Red Lite), that should be criminal. Finally a reputable site has covered this. It is often desirable to choose a CMR drive instead. Hope you don't mind me asking a question, since you might know. hey thanks for the quick reply! When that happens the drive has no choice but to write directly to SMR and invoke a performance penalty. Sometimes they put in blues or whatever because that’s all they can get. A pleasingly simple pair of lists makes it a quick and easy task to see if your 3.5- and 2.5-inch Toshiba HDD uses SMR or CMR tech within. Testing commenced immediately after the drive prep was completed. Maybe I’m in the minority here. Stupid WD support… ). 2) For backup purposes SMR HDD and QLC SSD is a good choice. 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