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How to proper set disk standby and ZFS sync time

Hard disks, HDD, RAID Hardware, disk controllers, SATA, PATA, SCSI, IDE, On Board, USB, Firewire, CF (Compact Flash)
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erico.bettoni
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How to proper set disk standby and ZFS sync time

#1

Post by erico.bettoni »

I've been meaning to ask this question for some time now, and since I've finished resolving the other problems I had with my boxes it's finally time to get to it.

1. What you guys think is the best way to configure the disks standby time? How to do it?
2. What also would be some good parameters to avoid ZFS to write to disks all the time? How to do it?

My two boxes have 32GB of RAM, both have SSD for ZIL and CACHE and booth have multiple 6+ data disks running in raidz2.
Also, booth have dedicated controlers SAS/SATA controllers in IT mode AND have good UPS's to keep them up.

Feel free to ask any questions.
Thank you!

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crowi
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Re: How to proper set disk standby and ZFS sync time

#2

Post by crowi »

1. set the standby time at Disks|Management|HDD Management
you have to activate it in the settings for each single drive
2. what do you exactly mean by: "What also would be some good parameters to avoid ZFS to write to disks all the time? How to do it?"

Generally it is not recommended to set ZFS disks on standby, read here http://wiki.nas4free.org/doku.php?id=warnings

However, I set mine to spin down after 20 minutes, up to now I have had no issues with this setting to date (I also use a SSD for ZIL and L2ARC), but it's your risk, of course.
NAS 1: Milchkuh: Asrock C2550D4I, Intel Avoton C2550 Quad-Core, 16GB DDR3 ECC, 5x3TB WD Red RaidZ1 +60 GB SSD for ZIL/L2ARC, APC-Back UPS 350 CS, NAS4Free 11.0.0.4.3460 embedded
NAS 2: Backup: HP N54L, 8 GB ECC RAM, 4x4 TB WD Red, RaidZ1, NAS4Free 11.0.0.4.3460 embedded
NAS 3: Office: HP N54L, 8 GB ECC RAM, 2x3 TB WD Red, ZFS Mirror, APC-Back UPS 350 CS NAS4Free 11.0.0.4.3460 embedded

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