Marcos Yes I understand what you are saying and that is great for a 1Gbps network, I have a 200Gbps network and I am only getting 140MiB/sec. There is just something different with how the data is being read out of this storage system.
Don On Mon, Nov 11, 2024 at 9:40 AM Marcos Sungaila <marcos.sunga...@oracle.com> wrote: > Don, > > > > Sorry, I wasn’t clear in my previous e-mail. My comment about small disks > actually is about how much disk space you have currently in use, not the > virtual disk size. > > For example, I have a 200GB virtual disk VM with only 4,6 GB in use. It > takes about 40 sec to transfer the disk to an NFS share in my lab reaching > 128MiB/sec on a 1Gbps network connection. > > > > Marcos > > > > *From:* Don Dupuis <donds...@gmail.com> > *Sent:* Monday, November 11, 2024 11:32 AM > *To:* Marcos Sungaila <marcos.sunga...@oracle.com> > *Cc:* users <users@ovirt.org> > *Subject:* Re: [External] : [ovirt-users] oVirt slow backups from ISCSI > storage domain to nfs target > > > > Marcos, > > These are not small files, the files I am talking about are about 400GB or > bigger. If I do the same thing on another DE6000 with SAS disks, I don't > see this issue. Thin provisioned disks are ok on both storage systems, But > the 6600F has NVME interfaced SSDs and runs this slow on preallocated > disks. For the short term we are just going to go back to thin provisioned > as we can't get the backups to finish in the allocated time windows. > > > > Don > > > > On Mon, Nov 11, 2024 at 5:23 AM Marcos Sungaila < > marcos.sunga...@oracle.com> wrote: > > Hi Don, > > > > When transferring small files to an NFS share, many times, they can fit > the in-memory cache, leading to high transfer rates. For bigger files, the > remote NFS storage will need to commit data to the disk once the cache is > filled. > > In general, it is common to see the initial data transfer at high numbers, > slowing down as the transfer continues. This behavior is not only with NFS > shares; you may face the same behavior using scp. > > Anyway, it is recommended that a transfer test be run using other methods > to confirm this is the cause. > > > > Marcos > > > > *From:* Don Dupuis <donds...@gmail.com> > *Sent:* Friday, November 8, 2024 5:06 PM > *To:* users <users@ovirt.org> > *Subject:* [External] : [ovirt-users] oVirt slow backups from ISCSI > storage domain to nfs target > > > > Hi > > I am using oVirt 4.4.10.7 with vms on iscsi Lenovo DE-6600F(nvme > interfaced ssds). Backing up thin vms performance is fine, but with > preallocated disks, backups to nfs storage with 200Gb interface is only > transferring qcow2 image to nfs at 140MiB per sec. Why is qemu-nbd so slow > with preallocated images? Does anyone have any issues related to this? Any > help would be appreciated. I have made iscsid.conf changes, linux kernel > boot changes, and still the same performance. > > > > Thanks > > Don > >
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