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Grinch Moderator Joined: May 29, 2011 Messages: 10,361 Thanks Received: 1,831 Trophy Points: 161 Location: WHO(1)ville, Unixland One of tler wd green the problems with consumer-grade hard drives is that most of them will hang

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in the event that they run into an error, and will internally retry the operation, possibly for a minute or more. wd tler utility For a desktop PC, where redundancy does not exist, this is the correct course of action, because failure of a sector means loss of the data. Enterprise class drives typically support the ability to http://www.smallnetbuilder.com/nas/nas-features/31202-should-you-use-tler-drives-in-your-raid-nas limit the amount of time a drive wastes trying to recover data. Most of these drives are used in RAID arrays, and so in the event of a failure, the data can be recovered from parity. A drive encountering read errors cannot be allowed to hang for large amounts of time, because this stalls whatever the server is trying to do. So manufacturers include features to control the retries https://forums.freenas.org/index.php?threads/checking-for-tler-erc-etc-support-on-a-drive.27126/ of failures. For Western Digital, this is called TLER - Time-Limited Error Recovery. Great PDF. For Seagate, it is called ERC - Error Recovery Control. Samsung and Hitachi call it CCTL. Some people are confused and think that these features are only necessary for hardware RAID, or aren't useful for software RAID. It is absolutely true that this is a very important feature for hardware RAID, because a hardware RAID controller is probably configured to deem a "hung" hard drive as failed and to place it in an offline or recovery status, which has many negatives associated with it. So you absolutely do want TLER/ERC/etc for a hardware RAID setup. But what about ZFS? If you've got a ZFS pool, and your underlying disk device appears to hang for a minute, you probably stop serving up data. This is likely to be bad behaviour for a filer. Unlike a hardware RAID controller, ZFS will typically wait for the command to complete, and if it is trying to read many sectors, this could take a very long time. So TLER/ERC/etc are also desirable properties for a ZFS system. We've been thrilled in recent years to see the addition of "NAS" class hard drives, which are ess

this thread only Search this forum only Display results as threads More... Useful Searches Recent Posts Home Forums Forums Quick Links Search Forums Recent Posts Resources Resources Quick Links Search Resources Most Active Authors Latest Reviews Members Members Quick Links Notable https://forums.servethehome.com/index.php?threads/manually-enable-cctl-tler-for-drives-in-hw-raid.8939/ Members Current Visitors Recent Activity New Profile Posts Menu Menu Log in ServeTheHome and ServeThe.Biz Forums Home Forums > Hardware > RAID Controllers and Host Bus Adapters > This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More. Manually enable CCTL / TLER for drives in HW RAID? Discussion in 'RAID Controllers and Host Bus Adapters' started by Stereodude, Mar 7, 2016. Stereodude Active error enabling Member Joined: Feb 21, 2016 Messages: 302 Likes Received: 39 Do true hardware RAID cards, specifically the various LSI based cards, automatically enable CCTL / TLER and set the appropriate timeout delay on drives plugged into them, or is that something that should be done manually before putting the drives on the controller? IE: I buy a stack of enterprise based drives for HW based RAID. Do I need to configure each drive one at error enabling raid a time while on a HBA with a program like smartctl to enable CCTL / TLER and set a appropriate timeout delay prior to connecting the drives to the LSI HW based RAID card? #1 Stereodude, Mar 7, 2016 Stereodude Active Member Joined: Feb 21, 2016 Messages: 302 Likes Received: 39 Hmm... No replies. I guess I will attempt to test this. My thought is to pull a drive from an array and see if CCTL / TLER is set. Of course that doesn't rule out the possibility that the controller clears the setting during shut down. A slightly more comprehensive tests will be necessary. My thought is to take 2 drives, enable CCTL / TLER on one, not on the other. Put on the HW RAID card, make an array with them, use them a bit, shut down and pull the drives and see if none, one, or both have CCTL / TLER enabled. #2 Stereodude, Mar 8, 2016 aj84 Member Joined: Oct 28, 2015 Messages: 55 Likes Received: 24 Some time ago I experimented with CCTL / TLER and changing the drive-settings with smartctl: all drives I tested lost the custom setting after a power cycle (sometimes it even doesn't survive a reboot) - they simply returned to their factory defaults (in my tests: SCT Error Recovery Control Read/

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