--Apple-Mail=_3D21898F-64FE-46D0-BF2A-D3D37F516006 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 I just got bitten by this particular problem, on a heavily used disk = image. I'm trying to defragment the disk images. Hop this will help.
Le 8 juin 2017 =C3=A0 07:19, Markus Stockhausen = <stockhausen@collogia.de> a =C3=A9crit : =20 Hi Fernando,=20 =20 we personally like XFS very much. But XFS + qcow2 (even for snapshots = in OVirt) comes close to a no-go these days. We are experience excessive = fragmentation. For more info see unresolved Redhat Info: =20 https://access.redhat.com/solutions/532663 = <https://access.redhat.com/solutions/532663> =20 Even with tuning the XFS allocation policy on the qcow2 directory with=20=
=20 xfs_io -c 'extsize -R 2M' <qcow2-dir> =20 A nice 3rd party explanation can be found here: =20 = https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-dead= lock-kmem_alloc/ = <https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-dea= dlock-kmem_alloc/> =20 Markus =20 Von: users-bounces@ovirt.org <mailto:users-bounces@ovirt.org> = [users-bounces@ovirt.org <mailto:users-bounces@ovirt.org>]" im Auftrag = von "FERNANDO FREDIANI [fernando.frediani@upx.com = <mailto:fernando.frediani@upx.com>] Gesendet: Mittwoch, 7. Juni 2017 23:35 An: users@ovirt.org <mailto:users@ovirt.org> Betreff: [ovirt-users] Performance differences between ext4 and XFS =20 Just wanted to find out what filesystem people are using to host = Virtual Machines in qcow2 files in a filesystem in Localstorage, ext4 or = XFS ? =20 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. =20 Fernando = <InterScan_Disclaimer.txt>_______________________________________________ Users mailing list Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users = <http://lists.ovirt.org/mailman/listinfo/users>
--Apple-Mail=_3D21898F-64FE-46D0-BF2A-D3D37F516006 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D"">I just got bitten by this particular problem, on a heavily = used disk image. I'm trying to defragment the disk images. Hop this will = help.<div class=3D""><br class=3D""></div><div class=3D""><br = class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">Le = 8 juin 2017 =C3=A0 07:19, Markus Stockhausen <<a = href=3D"mailto:stockhausen@collogia.de" = class=3D"">stockhausen@collogia.de</a>> a =C3=A9crit :</div><br = class=3D"Apple-interchange-newline"><div class=3D""><div = style=3D"font-style: normal; font-variant-caps: normal; font-weight: = normal; letter-spacing: normal; orphans: auto; text-align: start; = text-indent: 0px; text-transform: none; white-space: normal; widows: = auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; = background-color: rgb(255, 255, 255); direction: ltr; font-family: = Arial; font-size: 10pt;" class=3D""><div class=3D""><div class=3D""><div = class=3D""><div class=3D""><div class=3D""><div class=3D""><div = class=3D""><div style=3D"font-family: Tahoma; font-size: 13px;" = class=3D"">Hi Fernando,<span = class=3D"Apple-converted-space"> </span></div><div = style=3D"font-family: Tahoma; font-size: 13px;" class=3D""><br = class=3D""></div><div style=3D"font-family: Tahoma; font-size: 13px;" = class=3D"">we personally like XFS very much. But XFS + qcow2 (even for = snapshots in OVirt)</div><div style=3D"font-family: Tahoma; font-size: = 13px;" class=3D"">comes close to a no-go these days. We are experience = excessive fragmentation.</div><div style=3D"font-family: Tahoma; = font-size: 13px;" class=3D"">For more info see unresolved Redhat = Info:</div><div class=3D""><font face=3D"Tahoma" class=3D""><span = style=3D"font-size: 13px;" class=3D""><br = class=3D""></span></font></div><div class=3D""><font face=3D"Tahoma" = class=3D""><span style=3D"font-size: 13px;" class=3D""><a = href=3D"https://access.redhat.com/solutions/532663" = class=3D"">https://access.redhat.com/solutions/532663</a></span></font></d= iv><div style=3D"font-family: Tahoma; font-size: 13px;" class=3D""><br = class=3D""></div><div style=3D"font-family: Tahoma; font-size: 13px;" = class=3D"">Even with tuning the XFS allocation policy on the qcow2 = directory with </div><div style=3D"font-family: Tahoma; font-size: = 13px;" class=3D""><br class=3D""></div><div class=3D""><font = face=3D"Tahoma" class=3D""><span style=3D"font-size: 13px;" = class=3D"">xfs_io -c 'extsize -R 2M' = <qcow2-dir></span></font></div><div style=3D"font-family: Tahoma; = font-size: 13px;" class=3D""><br class=3D""></div><div = style=3D"font-family: Tahoma; font-size: 13px;" class=3D"">A nice 3rd = party explanation can be found here:</div><div style=3D"font-family: = Tahoma; font-size: 13px;" class=3D""><br class=3D""></div><div = class=3D""><font face=3D"Tahoma" class=3D""><span style=3D"font-size: = 13px;" class=3D""><a = href=3D"https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocat= ion-deadlock-kmem_alloc/" = class=3D"">https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allo= cation-deadlock-kmem_alloc/</a></span></font></div><div = style=3D"font-family: Tahoma; font-size: 13px;" class=3D""><br = class=3D""></div><div style=3D"font-family: Tahoma; font-size: 13px;" = class=3D"">Markus</div><div style=3D"font-family: Tahoma; font-size: = 13px;" class=3D""><br = class=3D""></div></div></div></div></div></div></div></div><div = style=3D"font-family: 'Times New Roman'; font-size: 16px;" class=3D""><hr = tabindex=3D"-1" class=3D""><div id=3D"divRpF447039" style=3D"direction: = ltr;" class=3D""><font face=3D"Tahoma" size=3D"2" class=3D""><b = class=3D"">Von:</b><span class=3D"Apple-converted-space"> </span><a = href=3D"mailto:users-bounces@ovirt.org" = class=3D"">users-bounces@ovirt.org</a><span = class=3D"Apple-converted-space"> </span>[<a = href=3D"mailto:users-bounces@ovirt.org" = class=3D"">users-bounces@ovirt.org</a>]" im Auftrag von "FERNANDO = FREDIANI [<a href=3D"mailto:fernando.frediani@upx.com" = class=3D"">fernando.frediani@upx.com</a>]<br class=3D""><b = class=3D"">Gesendet:</b><span = class=3D"Apple-converted-space"> </span>Mittwoch, 7. Juni 2017 = 23:35<br class=3D""><b class=3D"">An:</b><span = class=3D"Apple-converted-space"> </span><a = href=3D"mailto:users@ovirt.org" class=3D"">users@ovirt.org</a><br = class=3D""><b class=3D"">Betreff:</b><span = class=3D"Apple-converted-space"> </span>[ovirt-users] Performance = differences between ext4 and XFS<br class=3D""></font><br = class=3D""></div><div class=3D""></div><div class=3D""><font = face=3D"arial, helvetica, sans-serif" class=3D"">Just wanted to find out = what filesystem people are using to host<span = class=3D"Apple-converted-space"> </span></font>Virtual Machines in = qcow2 files in a filesystem in Localstorage, ext4 or XFS ?<br = class=3D""><br class=3D"">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 class=3D""><br class=3D"">Fernando<br = class=3D""></div></div></div><span = id=3D"cid:0583B5F5-532F-462E-A18F-E203C8395CED@dsone.3ds.com"><InterSca= n_Disclaimer.txt></span><span style=3D"font-family: Helvetica; = font-size: 12px; font-style: normal; font-variant-caps: normal; = font-weight: normal; letter-spacing: normal; orphans: auto; text-align: = start; text-indent: 0px; text-transform: none; white-space: normal; = widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; = background-color: rgb(255, 255, 255); float: none; display: inline = !important;" = class=3D"">_______________________________________________</span><br = style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: normal; letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" = class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; = font-style: normal; font-variant-caps: normal; font-weight: normal; = letter-spacing: normal; orphans: auto; text-align: start; text-indent: = 0px; text-transform: none; white-space: normal; widows: auto; = word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: = rgb(255, 255, 255); float: none; display: inline !important;" = class=3D"">Users mailing list</span><br style=3D"font-family: Helvetica; = font-size: 12px; font-style: normal; font-variant-caps: normal; = font-weight: normal; letter-spacing: normal; orphans: auto; text-align: = start; text-indent: 0px; text-transform: none; white-space: normal; = widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; = background-color: rgb(255, 255, 255);" class=3D""><a = href=3D"mailto:Users@ovirt.org" style=3D"font-family: Helvetica; = font-size: 12px; font-style: normal; font-variant-caps: normal; = font-weight: normal; letter-spacing: normal; orphans: auto; text-align: = start; text-indent: 0px; text-transform: none; white-space: normal; = widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; = background-color: rgb(255, 255, 255);" class=3D"">Users@ovirt.org</a><br = style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: normal; letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" = class=3D""><a href=3D"http://lists.ovirt.org/mailman/listinfo/users" = style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: normal; letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" = class=3D"">http://lists.ovirt.org/mailman/listinfo/users</a><br = style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; = font-variant-caps: normal; font-weight: normal; letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" = class=3D""></div></blockquote></div><br class=3D""></div></body></html>= --Apple-Mail=_3D21898F-64FE-46D0-BF2A-D3D37F516006--