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Degraded write performance Thunderbay4  

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Posts: 5
 Tico
Customer
(@tico)
Active Member
Joined: 3 years ago

I added two 6tb hgst HGST HUS726060ALA640 to my existing HGST HUS726060ALA640 and Toshiba X300 6TB Raid 0 to create a raid 5 array.
All disks had been certified with SR. I reinitialized all disks creating a raid 5 with 1 tb partition, 2 tb partition and a 14 tb partition. The partitions also passed validation. I'm using a Thunder bay4 with Raid-xt and TB2 connection to a mid 2104 rMBP. I'm running High Sierra 12.13.4 beta 2 refresh . I also have a Akito miniQuad4 with 4 SSD's in a raid 0.

I'm only getting a ~ 75mb write for any partition on the TB4 and a ~ 500 read.
On the MiniQuad I'm getting the expected ~1000mb write & ~ 1100 read.

I have other machines with akito TB3 quad 4 & internal raid arrays and have never seen these problems.

Any ideas?

8 Replies
Posts: 2278
Moderator
(@softraid-support)
Member
Joined: 5 years ago

Seems like write cache is disabled. Are you running an expired trial version?

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Posts: 5
 Tico
Customer
(@tico)
Active Member
Joined: 3 years ago

Seems like write cache is disabled. Are you running an expired trial version?

I forgot to say the write cache is enabled. I don't see the speed reduction on my Akitio mini QuadX (tb3) running on the same machine. I'm using a 30 day trial version while I'm waiting for my Softraid xt to upgraded to full version since I got the Akitio. The procurement order should be ready tomorrow then I'll have the full version.

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Posts: 5
 Tico
Customer
(@tico)
Active Member
Joined: 3 years ago

Seems like write cache is disabled. Are you running an expired trial version?

Just got my serial number put in & rebooted. Same behavior.

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Posts: 2278
Moderator
(@softraid-support)
Member
Joined: 5 years ago

Sorry I have to ask basic questions, but this is a forum.

How full is the volume? You implied it was freshly created?

If you have a volume on the same machine that is writing fast (normally), then this has to be a hardware issue.

If this volume is "new", can you do some destructive tests? I am thinking of "zero disk", on each disk, one at a time. Let it run for a while on each disk, and make sure all are showing the same speeds.

Also, are you using "archive" drives? Those get really slow after a few minutes of writing, and could explain this behavior.

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