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 <[email protected]> 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 <[email protected]> > *Sent:* Friday, November 8, 2024 5:06 PM > *To:* users <[email protected]> > *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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