From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Peter Sangas" Subject: RE: "bitmap" line in /proc/mdstat Date: Fri, 14 Oct 2016 10:32:47 -0700 Message-ID: <005501d22640$fc4d6a20$f4e83e60$@wnsdev.com> References: <5800AE09.70608@bluewin.ch> <8922e2e1-b612-fa32-6932-9f4158f52fe6@turmel.org> <003401d22635$32b7bc70$98273550$@wnsdev.com> <580107FA.40901@bluewin.ch> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Return-path: In-Reply-To: <580107FA.40901@bluewin.ch> Content-Language: en-us Sender: linux-raid-owner@vger.kernel.org To: 'Ramon Hofer' , linux-raid@vger.kernel.org List-Id: linux-raid.ids Thanks Ramon. Do you know why some of your mds were created with bitmaps and others were not? When I installed Ubuntu 16.04 and used the installer to create a RAID1 some of the mds had bitmaps and some did not. Thanks, Pete -----Original Message----- From: Ramon Hofer [mailto:ramonhofer@bluewin.ch] Sent: Friday, October 14, 2016 9:30 AM To: Peter Sangas; linux-raid@vger.kernel.org Subject: Re: "bitmap" line in /proc/mdstat On 14/10/16 18:08, Peter Sangas wrote: > Can you quantify the performance decrease and if rebuild time is not as important as performance how does one remove the bitmap? From the Linux RAID wiki: "Some limited measurements I have done suggest up to 10% slowdown, though usually less. Possibly some tuning can make it much better." [1] [1] https://raid.wiki.kernel.org/index.php/Write-intent_bitmap#How_Bitmaps_Work_by_Q.26A Regards, Ramon -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html