Badblocks'ing a set of 8 drives, one drive is slower then the other seven. Is this an issue?
Howdy. So I'm in the process of building a new pool for my NAS. I have eight 18tb drives that I've burnin with Spearfoot's disk-burnin-and-testing script from GitHub. Everything has been going smooth so far at 65 hours in. I do have one possible issue however, one of the drives is testing at a slower rate then the others.
90.82% done, 65:24:36 elapsed. (0/0/0 errors)
95.90% done, 65:24:51 elapsed. (0/0/0 errors)
88.11% done, 65:24:43 elapsed. (0/0/0 errors)
53.61% done, 65:24:35 elapsed. (0/0/0 errors)
88.58% done, 65:24:38 elapsed. (0/0/0 errors)
89.32% done, 65:24:49 elapsed. (0/0/0 errors)
88.89% done, 65:24:46 elapsed. (0/0/0 errors)
94.82% done, 65:24:37 elapsed. (0/0/0 errors)
So these look good so far, the majority of the drives which are chugging along within + or - 5% of one another. While that top right drive that has fallen behind and is now -40% behind its peers and it continues to slowly fall away from the pack.
So my question is does this drive have an issue where its running at a slower speed to its peers or is this nothing to worry about? Once the burnin has finished I was thinking I would speed test each drive and see if anything shows up.
grep dmesg and see if the link is at sataII speeds, if so its almost certainly the cable. If not, still might be ok. Your motherboards IC may perfer some sata ports over others when its at its limit. Remember it likely runs on a 1x pcie bus back to the system bus which is ~ 800MB/s. You have 8 drives so...
Only panic when there isnt a lot of data being pushed and the drive still performs badly and you have replaced cable