May 28, 20197 yr On reboot today I was alerted by FCP that three of my disks have "Write Cache is disabled" errors: Write Cache is disabled on disk4 You may experience slow read/writes to disk4. Write Cache should be enabled for better results. Post your diagnostics for other users to confirm this test and advise. NOTE: If this drive is connected to your server via USB, then this test and the fix may or may not work / be accurate as USB support for smartctl and hdparm is hit and miss Write Cache is disabled on disk5 You may experience slow read/writes to disk5. Write Cache should be enabled for better results. Post your diagnostics for other users to confirm this test and advise. NOTE: If this drive is connected to your server via USB, then this test and the fix may or may not work / be accurate as USB support for smartctl and hdparm is hit and miss Write Cache is disabled on disk6 You may experience slow read/writes to disk6. Write Cache should be enabled for better results. Post your diagnostics for other users to confirm this test and advise. NOTE: If this drive is connected to your server via USB, then this test and the fix may or may not work / be accurate as USB support for smartctl and hdparm is hit and miss I ran a check on disk4: hdparm -W /dev/sdl /dev/sdl: write-caching = 0 (off) then: sudo hdparm -W1 /dev/sdl /dev/sdl: setting drive write-caching to 1 (on) write-caching = 0 (off) Seems like I can't set it to "on". Should I be concerned about the drives? server-diagnostics-20190528-0256.zip
May 29, 20197 yr Same here, after a reboot all 4 of my disks have disabled caches. any information on this?
May 29, 20197 yr Community Expert 14 minutes ago, DelSol said: Same here, after a reboot all 4 of my disks have disabled caches. any information on this? Other than the fact that this is a new test only recently added to so may not be new condition. The real important point at the moment is whether you have suddenly seen performance badly decrease.
May 29, 20197 yr My disks seem as fast(or slow) as they used to be. If the test is new, maybe my drive cache has been disabled before?!
May 29, 20197 yr Community Expert 1 minute ago, DelSol said: maybe my drive cache has been disabled before?! Yes, you just were never warned about it.
May 30, 20197 yr Author Thanks for the response, I'll quit panicking. Any benchmark tools you'd recommend to track drive performance over time?
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