9:31 a.m.
Hello,
I am wondering why it takes so long to provision a HDD for a VM? I
typically do full provision (as opposed to "thin" provision) and while I
have never sat there and timed it, it takes at least ten minutes to
provision a 32GB HDD. I provisioned a 100GB HDD earlier today and even
after 45 minutes it was not complete.
I am from the VMware world where it takes less than a minute (usually
more like 30 seconds or so) to provision a VM, regardless of HDD assigned.
My host's physical HDD's are 2x2TB SATA drives in a hardware RAID1.
oVirt storage is an NFS pool connecting to my host machine (for all
intents and purposes, local storage)
I wonder if I have things mis-configured? Is it normal for provisioning
to take that long?
Thanks! :-)
-Alan
11:39 a.m.
Hi Alan,
Since your disks are configured as pre-allocation, vdsm use the dd command when creating
them.
perhaps you could try to monitor the dd command to analyze the progress.
BTW, Is there any reason not to use thin provisioning?
Regards,
Maor
----- Original Message -----
From: "Alan Murrell" <lists(a)murrell.ca>
To: "users" <users(a)ovirt.org>
Sent: Monday, May 18, 2015 9:31:31 AM
Subject: [ovirt-users] Why so long to add virtual HDD?
Hello,
I am wondering why it takes so long to provision a HDD for a VM? I
typically do full provision (as opposed to "thin" provision) and while I
have never sat there and timed it, it takes at least ten minutes to
provision a 32GB HDD. I provisioned a 100GB HDD earlier today and even
after 45 minutes it was not complete.
I am from the VMware world where it takes less than a minute (usually
more like 30 seconds or so) to provision a VM, regardless of HDD assigned.
My host's physical HDD's are 2x2TB SATA drives in a hardware RAID1.
oVirt storage is an NFS pool connecting to my host machine (for all
intents and purposes, local storage)
I wonder if I have things mis-configured? Is it normal for provisioning
to take that long?
Thanks! :-)
-Alan
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7:59 p.m.
On 05/18/2015 01:39 AM, Maor Lipchuk wrote:
Since your disks are configured as pre-allocation, vdsm use the dd
command when creating them.
perhaps you could try to monitor the dd command to analyze the progress.
I will see if I can do that, though if it is using dd, that would
explain the time it takes.
BTW, Is there any reason not to use thin provisioning?
I would like to avoid over-allocating the disk space. If I
thin-provision, and over-allocate my physical space, there may come a
day when I run out of physical space even though I have "space"
avaialble on my VMs.
-Alan
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2 comments
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participants (2)
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Alan Murrell -
Maor Lipchuk