https://community.hpe.com/t5/disk-enclosures/turing-off-writeback-cache-on-hsg80/m-p/3483977#M15296 Correct - if you disable writeback cache a failure will not compromise data integrity and the host is only informed of a completed write when the data's safely on disk. Of course this can also incur a substantial performance penalty.<BR /><BR />FYI - your firmware is seriously out of rev as far as patches go. I think HP is up to patch #13 for ACS 8.6. Fri, 11 Feb 2005 16:57:51 GMT Mark Poeschl_2 2005-02-11T16:57:51Z https://community.hpe.com/t5/disk-enclosures/turing-off-writeback-cache-on-hsg80/m-p/3483976#M15295 We have a HSG80 (V86F-1) based array with a single controller and cache. I'm concerned that a controller/cache/ECB failure will result in data loss. If I turn off writeback caching (set d0 nowriteback_cache), will this ensure data integrity if the cache fails?<BR />I presume that the host will only be informed that the write is sucessful when it is physically written. Fri, 11 Feb 2005 12:10:47 GMT https://community.hpe.com/t5/disk-enclosures/turing-off-writeback-cache-on-hsg80/m-p/3483976#M15295 Glenn Tice 2005-02-11T12:10:47Z https://community.hpe.com/t5/disk-enclosures/turing-off-writeback-cache-on-hsg80/m-p/3483977#M15296 Correct - if you disable writeback cache a failure will not compromise data integrity and the host is only informed of a completed write when the data's safely on disk. Of course this can also incur a substantial performance penalty.<BR /><BR />FYI - your firmware is seriously out of rev as far as patches go. I think HP is up to patch #13 for ACS 8.6. Fri, 11 Feb 2005 16:57:51 GMT https://community.hpe.com/t5/disk-enclosures/turing-off-writeback-cache-on-hsg80/m-p/3483977#M15296 Mark Poeschl_2 2005-02-11T16:57:51Z