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Why are these writes slow?

H

HammerSandwich

[H]ard|Gawd
Joined
Nov 18, 2004
Messages
1,126
I would appreciate help understanding this one.

  • Tried an older WD5000AAKS for backups
  • Direct connection to FreeNAS 9211-8i IT HBA
  • New ZFS volume with FreeNAS GELI encryption
  • cp in shell
  • Even with large files (e.g. PC images), write speed was 3-4MBps
  • Moved HD to Win7 PC via USB3 dock & made new NTFS
  • SMART info 100% (forgot to screenshot, but no realloc, CRC, etc.)
  • Explorer copy was normal at ~80MBps
  • Ran full format with speed smoothly declining from 100MBps to 50ish
  • SMART still 100%
  • Back to FreeNAS with same results
  • Scrub ran at ~75MBps with 0 issues
Only things I see to try are a different breakout cable & running on FreeNAS without encryption. That said, a different HD was fine on this cable last week, & the server has plenty of beef. CPU maxes at 10% during the cp, and there's no other significant load at this time. I'll redo the volume without encryption & try again.

Any other ideas?
 
HammerSandwich said:
Looks like the drive. Swapped in a 750 Black, which is writing at 120MBps.
Click to expand...

That is very intresting, things like this happen due to compatability issues but I have not seen such things in over a decade. Can you check what sata ide mode it was recognized as? I am not sure about how to do it in your specific case, but crystal dismark in their main window tansfer mode shows what mode it is transfering at and what mode the drive is.. It also shows the standard: which is the ATA transfer mode the drive connected at. Was a major problem before when things went wrong.
 
HammerSandwich said:
I just reconnected to verify. FreeNAS shows it as 300MBps.
Click to expand...

Okay that wont show if there was a problem. That just says it was recognized as a SATA drive. The ATA mode is where the problem shows up. With IDE drives windows would turn off bus mastering modes if there was any data transfer error and slow down the drive drastically. Crystal diskmark shows some of that information but not others. Windows will still downgrade the data transfer modes and some drivers will tell you the mode but not generally. To fix it you have to remove the drivers and reboot and reinstall it. But if there is a compatibility problem it will downgrade it again before you have a chance to check. I am just curious that it happens, usually it is a bad cable or bad connector.
 
I am familiar with that in Windows - remember XP with scratched CDs? - but don't know where else to look in BSD.

That said, it's not the mode.

After rehooking to answer your question, I used FreeNAS's wipe function. It tapered smoothly from 80MBps to 40. Followed that with 1 more cp & still saw 4MBps.

I'm stumped. And probably just going to use the HD elsewhere at this point. Not worth so much time on a $25 drive.
 
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