- May 29, 2011
So with TLER not working, ZFS would patiently wait for the read request to complete, right? But eventually it would give up and then what happens? If all I'm storing is static media that doesn't ever change (only new material is being added at a steady trickle), how big a deal is it if TLER does not work?
Desktop drives also typically error out after a short timeout, but that's more like maybe ~30-60sec. When you notice your filer acting twitchy, log in and look.
I deem the value of TLER on an archival pool (ISO's, static media, etc.) where delays in reads do not qualify as catastrophic to be a "nice to have" but typically the cheap drives don't have it. I find it cheaper to just have some spare drives and to replace twitchy drives if they develop problems.