01-10-2021, 04:38 PM
(01-10-2021, 03:58 PM)fitkoh Wrote: I haven't been hiding. I've been living in a world with no locked doors.Yah, I know!.. It's far better, when it's the other way around; ie when one discovers Linux/Unix after having gone through M$$'s hell for sometimes :-)
(01-10-2021, 03:58 PM)fitkoh Wrote: Networking errors:A couple of possible causes that come to mind :
"Failed to synchronize cache for repos" when trying to run yum update -attempted fixes listed here
unable to connect via ssh
unable to download via wget or curl - they just stated "there's nothing to do"
> as root, try running these commands to rule out CentOS repository cache issues:
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# to purge dnf cache
dnf clean all
dnf repolist
dnf update -y> Rule out DNS issues:
Make sure the /etc/resolv.conf has at least 1 public dns in it; ie, 1.1.1.1 or 9.9.9.9 etc... Sometimes, it can be blank!
(01-10-2021, 03:58 PM)fitkoh Wrote: The disk ios were also low: in the kb/s range at 4k block size. I'm hoping I can find a way to get into the base system and run some benchmarks for comparison.I would say that's to be expected for a standard(/not in a RAID setup) HDD block device in a random read/write test. The values I get for a local HDD of mine are:
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fio Disk Speed Tests (Mixed R/W 50/50):
---------------------------------
Block Size | 4kb (IOPS) | 64kb (IOPS)
------ | --- ---- | ---- ----
Read | 402.00 KB/s (100) | 7.66 MB/s (119)
Write | 425.00 KB/s (106) | 8.06 MB/s (126)
Total | 827.00 KB/s (206) | 15.73 MB/s (245)
| |
Block Size | 512kb (IOPS) | 1mb (IOPS)
------ | ----- ---- | --- ----
Read | 25.98 MB/s (50) | 30.22 MB/s (29)
Write | 27.75 MB/s (54) | 32.90 MB/s (32)
Total | 53.73 MB/s (104) | 63.12 MB/s (61)Hence, why I did react when I saw VPS-14 disk I/Os in its review thread; those values are the ones that are atypical for HDD.