------=_NextPartTM-000-0ebd3f3f-1908-49ec-bde5-c3b2eba7f8ca Content-Type: multipart/alternative; boundary="_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01D79FEXCHANGEcollo_" --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01D79FEXCHANGEcollo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Fernando, we personally like XFS very much. But XFS + qcow2 (even for snapshots in OV= irt) comes close to a no-go these days. We are experience excessive fragmentatio= n. For more info see unresolved Redhat Info: https://access.redhat.com/solutions/532663 Even with tuning the XFS allocation policy on the qcow2 directory with xfs_io -c 'extsize -R 2M' <qcow2-dir> A nice 3rd party explanation can be found here: https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadl= ock-kmem_alloc/ Markus ________________________________ Von: users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag von "FER= NANDO FREDIANI [fernando.frediani@upx.com] Gesendet: Mittwoch, 7. Juni 2017 23:35 An: users@ovirt.org Betreff: [ovirt-users] Performance differences between ext4 and XFS Just wanted to find out what filesystem people are using to host Virtual Ma= chines in qcow2 files in a filesystem in Localstorage, ext4 or XFS ? I normally like XFS for big files which is the case fo VMs, but wondered if= anyone could see any performance advantage when compared with ext4. Fernando --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01D79FEXCHANGEcollo_ 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 bgcolor=3D"#FFFFFF" fpstyle=3D"1" ocsi=3D"0"> <div style=3D"direction: ltr;font-family: Arial;color: #000000;font-size: 1= 0pt;"> <div> <div> <div> <div> <div> <div> <div> <div style=3D"font-family: Tahoma; font-size: 13px;">Hi Fernando, </div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div style=3D"font-family: Tahoma; font-size: 13px;">we personally like XFS= very much. But XFS + qcow2 (even for snapshots in OVirt)</div> <div style=3D"font-family: Tahoma; font-size: 13px;">comes close to a no-go= these days. We are experience excessive fragmentation.</div> <div style=3D"font-family: Tahoma; font-size: 13px;">For more info see unre= solved Redhat Info:</div> <div><font face=3D"Tahoma"><span style=3D"font-size: 13px;"><br> </span></font></div> <div><font face=3D"Tahoma"><span style=3D"font-size: 13px;">https://access.= redhat.com/solutions/532663</span></font></div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div style=3D"font-family: Tahoma; font-size: 13px;">Even with tuning the X= FS allocation policy on the qcow2 directory with </div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div><font face=3D"Tahoma"><span style=3D"font-size: 13px;">xfs_io -c 'exts= ize -R 2M' <qcow2-dir></span></font></div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div style=3D"font-family: Tahoma; font-size: 13px;">A nice 3rd party expla= nation can be found here:</div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div><font face=3D"Tahoma"><span style=3D"font-size: 13px;">https://blog.co= decentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/= </span></font></div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> <div style=3D"font-family: Tahoma; font-size: 13px;">Markus</div> <div style=3D"font-family: Tahoma; font-size: 13px;"><br> </div> </div> </div> </div> </div> </div> <div id=3D"ofmeet-extension-installed" style=3D"display:none"></div> </div> </div> <div style=3D"font-family: Times New Roman; color: #000000; font-size: 16px= "> <hr tabindex=3D"-1"> <div id=3D"divRpF447039" style=3D"direction: ltr;"><font face=3D"Tahoma" si= ze=3D"2" color=3D"#000000"><b>Von:</b> users-bounces@ovirt.org [users-bounc= es@ovirt.org]" im Auftrag von "FERNANDO FREDIANI [fernando.fredia= ni@upx.com]<br> <b>Gesendet:</b> Mittwoch, 7. Juni 2017 23:35<br> <b>An:</b> users@ovirt.org<br> <b>Betreff:</b> [ovirt-users] Performance differences between ext4 and XFS<= br> </font><br> </div> <div></div> <div><font face=3D"arial, helvetica, sans-serif">Just wanted to find out wh= at filesystem people are using to host </font>Virtual Machines in qcow2 files in a filesystem in Localstorage, ext= 4 or XFS ?<br> <br> I normally like XFS for big files which is the case fo VMs, but wondered if= anyone could see any performance advantage when compared with ext4.<br> <br> Fernando<br> </div> </div> </div> </body> </html> --_000_12EF8D94C6F8734FB2FF37B9FBEDD173010E01D79FEXCHANGEcollo_-- ------=_NextPartTM-000-0ebd3f3f-1908-49ec-bde5-c3b2eba7f8ca 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. 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