On Apr 17, 2012, at 12:25 AM, Jim Klimov wrote: > 2012-04-17 5:15, Richard Elling wrote: >> For the archives... >> >> Write-back cache enablement is toxic for file systems that do not issue >> cache flush commands, such as Solaris' UFS. In the early days of ZFS, >> on Solaris 10 or before ZFS was bootable on OpenSolaris, it was not > > uncommon to have ZFS and UFS on the same system. >> >> NB, there are a number of consumer-grade IDE/*ATA disks that ignore >> disabling >> the write buffer. Hence, it is not always a win to enable the write >> buffer that cannot >> be disabled. >> -- richard > > For the sake of archives, can you please post a common troubleshooting > techinque which users can try at home to see if their disks honour the > request or not? ;) I guess it would involve random-write bandwidths in > two cases?
I am aware of only one method that is guaranteed to work: contact the manufacturer, sign NDA, read the docs. -- richard -- ZFS Performance and Training richard.ell...@richardelling.com +1-760-896-4422
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