RealActorRob Posted March 10, 2021 Share Posted March 10, 2021 (edited) I do one a week, and there's one going on right now due to a hard reset. Knock on wood, zero errors each time. 2 parity disks. Xeon X3440 with 16GB RAM. Disks are either on a 3Gbs onboard SATA slot (or Esata but same port) or a 6GBPS backplane with H310 in IT mode. So, the only thing I can figure is one disk is slow, but they never bench this slow. SLOWEST disk I have starts around or above 75Mbps but as you can see, it's super low above. Ideas? And I think I've done extended SMART checks on most/all the disks and SMART data isn't indicating much. A CRC error here and there but that's about it. Some of the read/writes in the graph are a preclear. New-to-me drives that passed extended SMART and now I'm just doing a preclear before I 'bother' since they appear to be used but good shape datacenter drives. (Ebay. Warrantied, and I've got two brands / models for dual parity.) The preclear is in a DS4246 on it's own controller. T310 Dell and the controller is in IIRC an 8X slot, so I don't think that's it. Edited March 10, 2021 by RealActorRob Quote Link to comment
JorgeB Posted March 10, 2021 Share Posted March 10, 2021 Possibly a disk having slower zone(s), use the diskspeed docker, it can sometimes find the problem if it's big enough. Quote Link to comment
RealActorRob Posted March 10, 2021 Author Share Posted March 10, 2021 7 hours ago, JorgeB said: Possibly a disk having slower zone(s), use the diskspeed docker, it can sometimes find the problem if it's big enough. Yeah, I've used it but probably for best accuracy I need to shut down the array and test. I've got 2x4TB undergoing preclear and will probably be replacing the slowest drives so hopefully that's one of them. Quote Link to comment
PeteAron Posted March 10, 2021 Share Posted March 10, 2021 (edited) In my case i believe i have a failing drive but it's odd. I am getting CRC errors even though i am sure it isnt the connections. I mention it because i was using this drive to replace another disk in my array, and my rebuild speeds were varying from 10 Mb/s to the more normal 130-160 while trying to rebuild the disk. I took it out of the array and replaced it with another. I am going to rma the drive, even though the only issue is crc errors - it is up to 1475 crc errors now. You may have a similar issue. Edit: This drive had been precleared immediately before trying to put it into the array. Edited March 10, 2021 by kimifelipe Quote Link to comment
RealActorRob Posted March 10, 2021 Author Share Posted March 10, 2021 One thing I do see, it's not the 3TB drive I don't think because after 2TB it ramps up a LOT. But it sucks at many points UP TO 2TB so I can't point the finger definitively at one of the other drives. So the last 1TB is only going to take 2 hrs. Almost 24hrs to check 2TB is ridiculous. It doesn't seem like full drives would cause that much slowness during a read as nothing is being moved. Yes, I need to work on that with deletions/unBalance. Quote Link to comment
itimpi Posted March 10, 2021 Share Posted March 10, 2021 21 minutes ago, RealActorRob said: It doesn't seem like full drives would cause that much slowness during a read as nothing is being moved. Yes, I need to work on that with deletions/unBalance how full a drive is will have no effect on a parity check as the parity check works at the raw sector level and is unaware of the meaning of the contents of the sectors - just that they have a bit pattern it is going to use/check. 1 Quote Link to comment
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