Can I run a SMART test other than on the hour?

[NASbox]

Is it possible to run a SMART test at 4:15AM, 4:30AM, 4:45AM? Having everything run on the hour creates an unnecessary bottleneck that I would like to avoid if possible.

 

[Alecmascot]

"Custom" lets you do that.

 

[NASbox]

"Custom" lets you do that.

Sorry, I got confused, I though the smart tests were under the CRON tasks setting... my mistake, I checked back and there is a minutes entry for Cron but doesn't seem to be one under SMART. I've got an 8 drive pool, and I would like to run them off at 15 minute intervals so that I only have one going at a time, and I can get though all my drives in under 3 hours.

 

[danb35]

an unnecessary bottleneck

In what way do you think it does this? The answer to your question is no; smartd doesn't allow it (and it's smartd that does the SMART test scheduling, not cron), but have you observed any performance or other problems while SMART tests are running?

 

[NASbox]

In what way do you think it does this? The answer to your question is no; smartd doesn't allow it (and it's smartd that does the SMART test scheduling, not cron), but have you observed any performance or other problems while SMART tests are running?

I am operating on the assumption that a SMART test is going to keep the disk very busy and severely restrict performance? Am I wrong here? With a RAID-Z2, if I am just reading, the data will be available on 2 other disks that aren't busy if I do one disk at a time.

Am I mistaken as to the impact of this?

 

[danb35]

Am I mistaken as to the impact of this?

AFAIK, yes. Admittedly, mine are scheduled for late at night, but the long tests would take several hours (certainly into the next day), and I've never seen any performance degradation while they're running.