Slow write speed

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rsigler3
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Slow write speed

Post by rsigler3 » Wed Sep 11, 2019 10:34 am

Hey Gang,

I'm new here. Just added a QNAP 453BT3 to my MacBook Pro with 8 cores.

I'm getting 600 MB/s Read but only 150 MB/s write. I'm connected via Thunderbolt. Why is the write so slow?

Any ideas? I'm new to "server world" so please be kind. :)

Rob

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Re: Slow write speed

Post by rsigler3 » Wed Sep 11, 2019 10:36 am

Forgot to mention I have two 10TB drives in the unit. :)

dolbyman
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Re: Slow write speed

Post by dolbyman » Wed Sep 11, 2019 12:26 pm

150MB/s sounds ok for 2 drives in RAID 1 ...what disks do you have in it to expect more ?

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Re: Slow write speed

Post by rsigler3 » Thu Sep 12, 2019 12:14 am

OK, so maybe a dumb question, but would more disks (I only have 2 in now) make the write faster?

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Trexx
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Re: Slow write speed

Post by Trexx » Thu Sep 12, 2019 2:14 am

Again... to dolbyman's point... what KIND of disks do you have.

And adding more drives MIGHT improve write performance depending on if they are small vs. large files, protocol, proper OS X tuning, etc.
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Re: Slow write speed

Post by rsigler3 » Thu Sep 12, 2019 2:16 am

I HAVE TWO 10TB IronWolf 7200 drives. Thanks for any help!

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Re: Slow write speed

Post by rsigler3 » Thu Sep 12, 2019 8:29 am

Anybody?

dolbyman
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Re: Slow write speed

Post by dolbyman » Thu Sep 12, 2019 8:48 am

do a diskbench in the gui (can't check what app right now..traveling in asia) ..and see what the write speeds of the disks are

150MB/s sounds fine for sustained sequential write (random will be much lower)

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Re: Slow write speed

Post by rsigler3 » Thu Sep 12, 2019 9:31 am

How are some people on YouTube getting 600 read and write?

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Moogle Stiltzkin
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Re: Slow write speed

Post by Moogle Stiltzkin » Thu Sep 12, 2019 10:11 am

http://www.raid-calculator.com/default.aspx
Capacity: 10 TB
Speed gain: Up to 2x read speed, no write speed gain
Fault tolerance: 1-drive failure
maybe if you use ssd cache for the hdd raid you can better speeds perhaps over thunderbolt3 ? :'
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Re: Slow write speed

Post by Toxic17 » Thu Sep 12, 2019 4:03 pm

lets do some diagnostics in SSH on the nas.

SSH to your NAS.

then type in the following commands, cut and paste the results into a post (use the BBcode quotes/code) to make them readable in a post.

Code: Select all

qcli_storage -d

Code: Select all

qcli_storage -T force=1

Code: Select all

qcli_storage -t force=1
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Re: Slow write speed

Post by Toxic17 » Thu Sep 12, 2019 4:08 pm

since you have only added the NAS, was the raid array finished or was it still syncing/scrubbing when you ran the test perhaps?
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Re: Slow write speed

Post by Bob Zelin » Sat Sep 14, 2019 12:58 am

sigh -
this is the QNAP site for the TS-453BT3
https://www.qnap.com/en-us/product/ts-453bt3
They show 690 MB/sec/520 MB/sec, when using a 10G connection to a Win 10 PC, and the TS-453BT3 has
four RAID 0; 4 x Intel SSDSC2BB240G4 SSD -
see the word SSD ? see the word RAID 0 ?

You have 2 SATA drives, in a RAID 1 configuration. I have built several TS-453BT3's using four Seagate Ironwolf 7200 RPM drives in a RAID 5 configuration. You don't get more than 450 MB/sec (and I actually know what I am doing). You are watching too many YouTube videos. You only have 2 drives in there, and you are setup for RAID 1 mirroring, which means that when you write something to the one drive, it has to copy it to
the second drive. You should be happy with 150 MB/sec.
Put in 4 matching 7200 RPM drives, RAID 5, and you will get 450 MB/sec.
"But what about the specs on the QNAP website" - stop hoping that you will get the theoretical specs. You are not running SSD's, and you are not using RAID 0.

You have not said what your application is. Because you have a MacBook Pro, and the TS-453BT3, I am guessing that you might be doing video editing (Adobe, Resolve, FCP X). Even if you follow everything that I am
telling you (if this is in fact your application) - this will be fine for YOU. The TS-453BT3 is not suitable for multiple users doing 4K editing. I don't care what the QNAP promotional material says.

Bob Zelin
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Re: Slow write speed

Post by Toxic17 » Thu Sep 19, 2019 12:00 am

Bob Zelin wrote:
Sat Sep 14, 2019 12:58 am
sigh -
Bob Zelin
just catching your eye Bob.....

viewtopic.php?f=25&t=150578
Regards Simon

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