[ovirt-users] Re: iSCSI constantly reading from storage (about 8 Mbps) after connecting hosts to storage
On Fri, Oct 5, 2018 at 11:51 AM <silvio.delval(a)pandasecurity.com> wrote:
Hello again,
I created a storage domain. When I put that storage in "Maintenance",
iSCSI trafic drops to 0. When I activate the storage, iSCSI traffic raises
to about 7 or 8 Mbps constantly. The storage is empty, no VMs created yet.
The LUN is created Thin and Compressed in V7000. Any hint?
This may be the normal I/O done for cluster based locking, storage
monitoring
and storage mailbox.
In any host in the cluster:
- sanlock reads 1MiB from the logical volume "domain-uuid/ids" every 20
seconds
(or 10 seconds, need to check sanlock source).
- vdsm reads 4K from logical volume "domain-uuid/metadata" every 10 seconds
- vdsm refreshes LVM metdata every 300 seconds, running "vgs" and
"lvs"
for every storage domain.
- multipathd checks all LUNs every 20 seconds
On the SPM additionally:
- vdsm reads 10240 bytes from logical volume "domain-uuid/inbox" every 2
seconds
Nir
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