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About xerces8

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  1. I got a WD My Book 8 TB (WDBBGB0080HBK-EESN) and after some testing it looks like a non-SMR drive. See CDM screenshot attached (the disk was 99.999% full, to make it "sweat", the test with 0% full is almost the same except the SEQ values being 199MB/s). Also test with FIO as per this post suggests it is not SMR. The summary: TEST: (groupid=0, jobs=1): err= 0: pid=4768: Tue Sep 10 22:24:49 2019 write: IOPS=7, BW=73.2MiB/s (76.8MB/s)(85.8GiB/1200024msec) slat (usec): min=353, max=4294.0k, avg=2579.76, stdev=71064.79 clat (usec): min=2, max=9319.4k, avg=69451.95, stdev=100307.35 lat (msec): min=35, max=402895, avg=136.54, stdev=4401.42 clat percentiles (msec): | 1.00th=[ 41], 5.00th=[ 47], 10.00th=[ 51], 20.00th=[ 57], | 30.00th=[ 61], 40.00th=[ 64], 50.00th=[ 67], 60.00th=[ 70], | 70.00th=[ 74], 80.00th=[ 80], 90.00th=[ 87], 95.00th=[ 93], | 99.00th=[ 114], 99.50th=[ 188], 99.90th=[ 234], 99.95th=[ 239], | 99.99th=[ 9329] bw ( KiB/s): min=19922, max=183585, per=100.00%, avg=144614.45, stdev=17834.58, samples=1226 iops : min= 1, max= 17, avg=13.38, stdev= 1.78, samples=1226 lat (usec) : 4=0.02%, 20=0.02%, 50=0.05%, 100=0.01% lat (msec) : 50=9.84%, 100=87.85%, 250=2.17%, 500=0.02% cpu : usr=0.33%, sys=0.42%, ctx=0, majf=0, minf=0 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=0,8788,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=1 Run status group 0 (all jobs): WRITE: bw=73.2MiB/s (76.8MB/s), 73.2MiB/s-73.2MiB/s (76.8MB/s-76.8MB/s), io=85.8GiB (92.1GB), run=1200024-1200024msec
  2. Recently I bought (see other topic) an external USB drive from WD, hoping it would be not SMR, but it turned out to be such. Are there any non-SMR USB drives on the market at the lower price range? I'm loking at sizes of 5-6 TB.
  3. After filling it to about half and rerunning CDM, I got the typical values for 4K: read about 0.5 MB/s, write 6 MB/s
  4. CrystalDiskInfo says: Enclosure : WD My Book 25EE USB Device (V=1058, P=25EE, sa1) - Model : WDC WD60EDAZ-11BMZB0 Firmware : 80.00A80MZB0
  5. I purchased a WD 6 TB My Book Desktop Hard Drive - Black WDBBGB0060HBK (from Amazon, see link) and after running CDM is seems like it is a SMR drive: Did WD start selling SMR units? Or am I misinterpreting the results? Is there a reliable test to determine if a unit is SMR or not?
  6. Hi! Is there more info on what exactly is TGMR? I have a 8TB Seagate Desktop drive (CystalDiskInfo says it is a ST8000DM004-2CX188, haven't shucked it yet). The interesting thing is, CDM shows normal (as in "not SMR") values for 4K writing (same as for reading, about 1 MB/s), unlike about 10 MB/s, like for example my other 5TB SMR drive. Regards, David