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02-12-2009
| #1 (permalink) |
| | Defrag from the guest OS: does it make sense? Hello, I was wondering if - since defragging is a physical operation which re-allocates clusters in order to gain performance - running a defrag from a "virtual" OS makes sense or not, since actually everthing in the disk is, in the end, a single vhd file. Consider I have a few VMs (1 .vhd each ) running under Virtual Server, all hosted on 1 host (1 SAN disk each VM). I guess defragging the host's disk makes more sense... Am I missing something? thanks! k |
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02-12-2009
| #2 (permalink) |
| | Re: Defrag from the guest OS: does it make sense? Actually the newest versions of DiskKeeper are VM aware and can defragment internally and externally. I am not aware of any other VM aware (Hyper-V) defragment utilities. -- Geoff N. Hiten Principal SQL Infrastructure Consultant Microsoft SQL Server MVP "karamatic" <karamatic@xxxxxx> wrote in message news:14b581be-5bc8-4d4c-afa4-47ecad4ea69f@xxxxxx Quote: > Hello, > I was wondering if - since defragging is a physical operation which > re-allocates clusters in order to gain performance - running a defrag > from a "virtual" OS makes sense or not, since actually everthing in > the disk is, in the end, a single vhd file. > Consider I have a few VMs (1 .vhd each ) running under Virtual Server, > all hosted on 1 host (1 SAN disk each VM). > I guess defragging the host's disk makes more sense... > Am I missing something? > thanks! > > k |
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02-12-2009
| #3 (permalink) |
| | Re: Defrag from the guest OS: does it make sense? On Thu, 12 Feb 2009 15:38:44 -0500, "Geoff N. Hiten" <SQLCraftsman@xxxxxx> wrote: Quote: >Actually the newest versions of DiskKeeper are VM aware and can defragment >internally and externally. I am not aware of any other VM aware (Hyper-V) >defragment utilities. If a program on the host can break into a virtual machine and do low-level disk management then we have a no-isolation situation and a good point for exploits to use. I thought that a virtual computer was basically totally isolated from the host with exception of any networking interface.... -- Bo Berglund (Sweden) |
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02-12-2009
| #4 (permalink) |
| | Re: Defrag from the guest OS: does it make sense? It is aware when it is running in a VM environment and adjusts its behavior. You have to run it inside the VM and in the host to get full advantage. It does not breack the VM boundary. -- Geoff N. Hiten Principal SQL Infrastructure Consultant Microsoft SQL Server MVP "Bo Berglund" <boberglund@xxxxxx> wrote in message news:lb59p4hk2e3uqb8m8mh4m7ukhabgemquto@xxxxxx Quote: > On Thu, 12 Feb 2009 15:38:44 -0500, "Geoff N. Hiten" > <SQLCraftsman@xxxxxx> wrote: > Quote: >>Actually the newest versions of DiskKeeper are VM aware and can defragment >>internally and externally. I am not aware of any other VM aware (Hyper-V) >>defragment utilities. > VM or VHD aware? Makes a big difference. > If a program on the host can break into a virtual machine and do > low-level disk management then we have a no-isolation situation and a > good point for exploits to use. > I thought that a virtual computer was basically totally isolated from > the host with exception of any networking interface.... > > -- > > Bo Berglund (Sweden) |
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02-13-2009
| #5 (permalink) |
| | Re: Defrag from the guest OS: does it make sense? On 13 Feb, 05:23, "Geoff N. Hiten" <SQLCrafts...@xxxxxx> wrote: Quote: > It is aware when it is running in a VM environment and adjusts its behavior. > > You have to run it inside the VM and in the host to get full advantage. *It > does not breack the VM boundary. > > -- > Geoff N. Hiten > Principal SQL Infrastructure Consultant > Microsoft SQL Server MVP > > "Bo Berglund" <bobergl...@xxxxxx> wrote in message > > news:lb59p4hk2e3uqb8m8mh4m7ukhabgemquto@xxxxxx > > > Quote: > > On Thu, 12 Feb 2009 15:38:44 -0500, "Geoff N. Hiten" > > <SQLCrafts...@xxxxxx> wrote: Quote: Quote: > >>Actually the newest versions of DiskKeeper are VM aware and can defragment > >>internally and externally. *I am not aware of any other VM aware (Hyper-V) > >>defragment utilities. Quote: > > VM or VHD aware? Makes a big difference. > > If a program on the host can break into a virtual machine and do > > low-level disk management then we have a no-isolation situation and a > > good point for exploits to use. > > I thought that a virtual computer was basically totally isolated from > > the host with exception of any networking interface.... Quote: > > -- Quote: > > Bo Berglund (Sweden)- Nascondi testo citato > - Mostra testo citato - to specify my .vhd are alle fixed size ones) is good and improves performance of the VM itself, BUT you have to use a defrag tool which is aware of being defragging a VM and not a physical one. Is this right? thanks, k |
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02-13-2009
| #6 (permalink) |
| | Re: Defrag from the guest OS: does it make sense? Correct. Again, I recommend Diskeeper. Full Disclosure, I have some free licenses from them for testing. No other compensation is involved. -- Geoff N. Hiten Principal SQL Infrastructure Consultant Microsoft SQL Server MVP "karamatic" <karamatic@xxxxxx> wrote in message news:4712ffd8-088f-4374-8cba-a85ca6930ced@xxxxxx On 13 Feb, 05:23, "Geoff N. Hiten" <SQLCrafts...@xxxxxx> wrote: Quote: > It is aware when it is running in a VM environment and adjusts its > behavior. > > You have to run it inside the VM and in the host to get full advantage. It > does not breack the VM boundary. > > -- > Geoff N. Hiten > Principal SQL Infrastructure Consultant > Microsoft SQL Server MVP > > "Bo Berglund" <bobergl...@xxxxxx> wrote in message > > news:lb59p4hk2e3uqb8m8mh4m7ukhabgemquto@xxxxxx > > > Quote: > > On Thu, 12 Feb 2009 15:38:44 -0500, "Geoff N. Hiten" > > <SQLCrafts...@xxxxxx> wrote: Quote: Quote: > >>Actually the newest versions of DiskKeeper are VM aware and can > >>defragment > >>internally and externally. I am not aware of any other VM aware > >>(Hyper-V) > >>defragment utilities. Quote: > > VM or VHD aware? Makes a big difference. > > If a program on the host can break into a virtual machine and do > > low-level disk management then we have a no-isolation situation and a > > good point for exploits to use. > > I thought that a virtual computer was basically totally isolated from > > the host with exception of any networking interface.... Quote: > > -- Quote: > > Bo Berglund (Sweden)- Nascondi testo citato > - Mostra testo citato - to specify my .vhd are alle fixed size ones) is good and improves performance of the VM itself, BUT you have to use a defrag tool which is aware of being defragging a VM and not a physical one. Is this right? thanks, k |
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