I'm new to OMV and RAID in general. This is really my first setup. I setup OMV as a VM in ESXi. I connected four 8TB WD80EFZX 5400RPM HDDs in RAID10. What kind of read/write speed should I expect to be getting? I tried NAS performance tester 1.7 and I got an average write speed of 67 MB/sec and average read speed of 95 MB/sec. This seems a bit slow to me, but I don't really have anything to compare it to other than copying directly to a HDD. Help is appreciated.
what kind of read/write speeds should I expect with RAID10
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- OMV 4.x
- atomicrabbit
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4x read and 2x write speed gain
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4x read and 2x write speed gain
gain over what?
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normal use of 1 HDD.
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normal use of 1 HDD.
So you're saying if I had 100 MB/sec write speeds on a local HDD, I should get 200 MB/sec write speeds in the RAID? That's not the case as you can see above. What kind of diagnostics can I do to investigate this?
Also, when I was looking around the OMV UI, I noticed that in the RAID Management page, my raid is showing up with a "clean, degraded" state. What does that mean? I just set up this raid 2 weeks ago with brand new HDDs. What does degraded mean? I checked the smart values of the drives and they're all green/good.
Here are some outputs:
cat /proc/mdstat
CodePersonalities : [raid10] [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] md0 : active raid10 sde[3] sdc[1] 15627790336 blocks super 1.2 512K chunks 2 near-copies [4/2] [_U_U] bitmap: 117/117 pages [468KB], 65536KB chunk unused devices: <none>
Anything else I can provide?
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theoricaly yes. But hardware, bios, controllers, motherboard are a factor in that theorize.
http://www.raid-calculator.com/default.aspx
http://www.hardwaresecrets.com…aid0-really-increase-disk
When you create an array, it gets mostly 2 status:
- clean: everything is working fine. Hardware is good, data status is good.
- degraded: something wrong, or creation synchronization of data is not finish.An raid 6 array of 6 HDD of 1TO takes up to three hours to initialize and depending of system will appears as building, degraded or synchronizing...
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Re,
4x read and 2x write speed gain
absolutely theoretically ...
When you create an array, it gets mostly 2 status:
or broken/dead/false ...
What does degraded mean?
That one or more drives are missing. In your mdstat-output are only two of four drives listed and stated ...
You should fix that first - look in the logs for information about the failing drives!
Sc0rp
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Thank you for pointing again the most obvious theorical statement i wrote:
"theoricaly yes. But hardware, bios, controllers, motherboard are a factor in that theorize."
"When you create an array, it gets mostly 2 status:" forget to add death because it did not mention it, broken because some system dont even mention it and go directly for degraded.
"degraded: something wrong, or creation synchronization of data is not finish." means a disk is missing, or data is corrupted, or sync is not finis, or alien are really from mars !!! HO NO, i did forget to mention a disk might be missing.And concerning degraded array, the most simple but not obvious cause is a BAD SATA CABLE: clean, degraded array state after only a couple weeks of setting it up
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