Read speed half of write speed

  • Last Post 08 August 2017
Cornelius Qualley posted this 07 August 2017

Quick question. I have an Ex30 with Jx30 expansion (40 drives total, dual controller). The Ex30 is hooked in to a Brocade 5100 with SanLink2 8GB Fiber connections for the clients. there are only about 6 active clients at any given time. It's configured as RAID 50. I've noticed a decrease in read performance recently and I can't identify the root cause. I'm getting a solid 1100-1200 MB/sec write and the read is pretty jumpy, ranging from about 300-700 MB/sec. I'm using Blackmagic speed test. I believe when I initially set this up a couple years back I was maxing out the bandwidth on read and write, but the read definitely seems to be a little weak.

Does anyone have any suggestions on what may be causing this issue? I'm not seeing any errors, I routinely run maintenance on the Xsan file system, and I'm getting the same results regardless of the client.

Karthik K posted this 08 August 2017

Hi Cornelius,

It looks like this issue needs to be analyzed with the help of subsystem report of the unit to find out the problem. Please open a case at or call us at (408) 228-1500 to troubleshoot the issue.

Please follow the steps to save the service report.

Please login to the web interface of the unit and follow the below steps to save the complete subsystem report.

1. Click Save Service Report in the Header.

Information for the report is gathered and compiled. This action takes up to a few minutes, depending on the size of your RAID system.

2. Click the Save File option, then click the Save button. The report saves to your Host PC as a compressed HTML file.