1:47 p.m.
On Tue, Aug 3, 2021 at 12:24 PM Tony Pearce <tonyppe(a)gmail.com> wrote:
I believe "local" in this context is using the local ovirt
Host OS disk as
VM storage ie "local storage". The disk info mentioned "WDC
WD40EZRZ-00G" =
a single 4TB disk, at 5400RPM.
OP the seek time on that disk will be high. How many VMs are running off
it?
Are you able to try other storage? If you could run some monitoring on the
host, I'd expect to see low throughput and high delay on that disk.
Regards,
Tony Pearce
Stupid question:
I must be missing something.
AFAIR oVirt doesn't support local storage, one needs to choose localhost
NFS, single-host-Gluster to localhost-iSCSI.
Assuming I'm not mistaken, in my experience the type of storage domain used
has a considerable impact on performance, especially latency.
E.g. Running Bonnie++ on a Fedora Linux VM, single host GlusterFS has 2-3
times the latency of localhost NFS, and noticeably lower throughput.
Hence my question.
- Gilboa
On Tue, 3 Aug 2021 at 16:54, Gilboa Davara <gilboad(a)gmail.com> wrote:
>
> On Fri, Jul 30, 2021 at 5:17 PM <regloff(a)gmail.com> wrote:
>
>> This is a simple one desktop setup I use at home for being a nerd :)
>>
>> So it's a single host 'cluster' using local storage.
>>
>
> Sorry for the late reply.
> Define: local.
> NFS, Gluster or ISCSI?
>
> - Gilboa
>
>
>>
>> Host Info:
>> CentOS Linux 8 - 4.18.0-305.10.2.el8_4.x86_64 (I keep fairly well
>> updated)
>> Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz [Kaby Lake] {Skylake}, 14nm
>> The disk it's on is: WDC WD40EZRZ-00G (5400 RPM platter disk) - it's not
>> the fastest thing in the world, but it should be sufficient.
>>
>> VM info:
>> Windows 10 Professional (Desktop not server)
>> 6144 MB of RAM
>> 2 Virtual CPUS
>> - Some settings I ran across for 'Performance' mode and a couple I had
>> seen on some similar issues (the similar issues were quite dated)
>> Running in headless mode
>> I/O Threads enabled = 1
>> Multi-Queues enabled
>> Virt-IO-SCSI enabled
>> Random Number generator enabled
>> Added a custom property of 'viodiskcache' = writeback (Didn't seem
to
>> make any significant improvement)
>>
>> As I type this though - I was going to add this link as it's what I
>> followed to install the storage driver during the Windows install and then
>> in the OS after that:
>>
>> https://access.redhat.com/solutions/17463
>>
>> I did notice something.. it says to create a new VM with the 'VirtIO
>> disk interface' and I just noted my VM is setup as 'SATA'.
>>
>> Perhaps that is it. This is just my first attempt at running something
>> other than a Linux Distro under oVirt. When I first installed the Windows
>> guest, I didn't have the Virt-IO package downloaded initially. When Windows
>> couldn't find a storage driver, I found this info out.
>>
>> I think I'll deploy a new Windows guest and try the 'VirtIO-SCSI'
>> interface and see if my performance is any better. It's just a default
>> install of Windows at this point, so that'll be easy. :)
>>
>> Will update this thread either way!
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