------=_NextPartTM-000-bc0df54e-354f-4430-b495-bb3fece85829 Content-Type: multipart/alternative; boundary="_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01F673EXCHANGEcollo_" --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01F673EXCHANGEcollo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, we just set up a new 4.1.2 OVirt cluster. It is a quite normal HDD/XFS/NFS stack that worked quit well with 4.0 in the past. Inside the VMs we use XFS too. To our surprise we observe abysmal high IO during mkfs.xfs and fstrim inside the VM. A simple example: Step 1: Create 100G Thin disk Result 1: Disk occupies ~10M on storage Step 2: Format disk inside VM with mkfs.xfs Result 2: Disk occupies 100G on storage Changing the discard flag on the disk does not have any effect. Am I missing something? Best regards. Markus --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01F673EXCHANGEcollo_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <html dir=3D"ltr"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-= 1"> <style type=3D"text/css" id=3D"owaParaStyle"></style> </head> <body fpstyle=3D"1" ocsi=3D"0"> <div style=3D"direction: ltr;font-family: Arial;color: #000000;font-size: 1= 0pt;"> <div style=3D"font-family:Tahoma; font-size:13px"> <div style=3D"font-family:Tahoma; font-size:13px"> <div style=3D"font-family:Tahoma; font-size:13px"> <div style=3D"font-family:Tahoma; font-size:13px"> <div style=3D"font-family:Tahoma; font-size:13px"> <div> <div>Hi, </div> <div><br> </div> <div>we just set up a new 4.1.2 OVirt cluster. It is a quite normal</div> <div>HDD/XFS/NFS stack that worked quit well with 4.0 in the past. </d= iv> <div>Inside the VMs we use XFS too.</div> <div><br> </div> <div>To our surprise we observe abysmal high IO during mkfs.xfs </div> <div>and fstrim inside the VM. A simple example:</div> <div><br> </div> <div>Step 1: Create 100G Thin disk</div> <div>Result 1: Disk occupies ~10M on storage</div> <div><br> </div> <div>Step 2: Format disk inside VM with mkfs.xfs</div> <div>Result 2: Disk occupies 100G on storage</div> <div><br> </div> <div>Changing the discard flag on the disk does not have any effect.</div> <div><br> </div> <div>Am I missing something?</div> <div><br> </div> <div>Best regards.</div> <div><br> </div> <div>Markus</div> </div> </div> </div> </div> </div> <div id=3D"ofmeet-extension-installed" style=3D"display:none"></div> </div> </div> </body> </html> --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01F673EXCHANGEcollo_-- ------=_NextPartTM-000-bc0df54e-354f-4430-b495-bb3fece85829 Content-Type: text/plain; name="InterScan_Disclaimer.txt" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="InterScan_Disclaimer.txt" **************************************************************************** Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. Über das Internet versandte E-Mails können unter fremden Namen erstellt oder manipuliert werden. Deshalb ist diese als E-Mail verschickte Nachricht keine rechtsverbindliche Willenserklärung. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln Vorstand: Kadir Akin Dr. Michael Höhnerbach Vorsitzender des Aufsichtsrates: Hans Kristian Langva Registergericht: Amtsgericht Köln Registernummer: HRB 52 497 This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. e-mails sent over the internet may have been written under a wrong name or been manipulated. That is why this message sent as an e-mail is not a legally binding declaration of intention. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln executive board: Kadir Akin Dr. Michael Höhnerbach President of the supervisory board: Hans Kristian Langva Registry office: district court Cologne Register number: HRB 52 497 **************************************************************************** ------=_NextPartTM-000-bc0df54e-354f-4430-b495-bb3fece85829--