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What the hell is TLER? It’s a feature on some Hard Disks from some manufacturers (like Western Digital Green drives)
I came across then when I put my NAS together. I have four 1.5TB WD15EADS disk’s in my NAS, and have turned TLER -on- for each disk before building it in to my array.
“It is important to understand that TLER should be “Enabled” for a hard disk if it is being used in a RAID array to prevent the recovery time from a disk read or write error from taking too long, causing the RAID controller to flag the drive as failed, which drops the drive from the array.”
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How did you physically set this up? I’m looking for some advice before I start cracking open my new Asus and screwing stuff up.
I just bought 4 1-TB WD Caviar Black HDs to put in a new Symbology NAS. I didn’t realize that I would have to connect these guys to an internal SATA connection to run WDTLER (hasn’t WD heard of eSata, USB, etc?) From what I’ve gathered EVERY hard drive in a PC will have this setting changed when you run the command, possibly with the exception of non-WD drives. The Asus has a 1GB Hitatchi, so I’m assuming the utility will leave it alone.
I’m assuming this isn’t possible while the drives are installed in the NAS through ethernet, that would be asking too much.
I thinking I would have to take these steps:
1) set up a USB key as a bootable drive with WDTLER on it (no floppy)
2) open the PC, connect each of the WD drives (likely one at a time)
3) boot up with the USB drive as the first in sequence on the MOBO
4) run “TLER-ON” command when DOS comes up
5) repeat for each drive
6) install drives in the NAS
Thanks for any further insight you have!
~ Joe
You need to plug your WD disk’s in to a PC ONE AT A TIME, boot off your made-up floppy/cd/usb and run the command. shut down, plug the next disk in, do that one, and so on, until you are done.
Your process is pretty much spot on!
You probably do not HAVE to enable TLER, I just chose to, as it’s recommended for NAS use
good luck!
WD has disabled TLER in firmware on their drives beginning late 2009. You must now buy RE’s if you want to a RAID setup.
Really? Interesting. I must admit, I’ve had a lot of trouble using these WD green drives in a RAID configuration. I’ll never use them again, that’s for sure. I think when I upgrade to 2TB or larger (in future) drives, I’ll go with something suitable for RAID, regardless of cost. Thanks for the info, and thank’s for visiting my blog