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NAME
virt-alignment-scan - Check alignment of virtual machine partitions
SYNOPSIS
virt-alignment-scan [--options] -d domname
virt-alignment-scan [--options] -a disk.img [-a disk.img ...]
virt-alignment-scan [--options]
DESCRIPTION
When older operating systems install themselves, the partitioning tools place partitions at a sector misaligned with the underlying storage (commonly the first partition starts on sector C<63>). Misaligned partitions can result in an operating system issuing more I/O than should be necessary.
The virt-alignment-scan tool checks the alignment of partitions in virtual machines and disk images and warns you if there are alignment problems.
Currently there is no virt tool for fixing alignment problems. You can only reinstall the guest operating system. The following NetApp document summarises the problem and possible solutions: L<http://media.netapp.com/documents/tr-3747.pdf>
OUTPUT
To run this tool on a disk image directly, use the I<-a> option:
$ virt-alignment-scan -a winxp.img
/dev/sda1 32256 512 bad (alignment < 4K)
$ virt-alignment-scan -a fedora16.img
/dev/sda1 1048576 1024K ok
/dev/sda2 2097152 2048K ok
/dev/sda3 526385152 2048K ok
To run the tool on a guest known to libvirt, use the I<-d> option and possibly the I<-c> option:
# virt-alignment-scan -d RHEL5
/dev/sda1 32256 512 bad (alignment < 4K)
/dev/sda2 106928640 512 bad (alignment < 4K)
$ virt-alignment-scan -c qemu:///system -d Win7TwoDisks
/dev/sda1 1048576 1024K ok
/dev/sda2 105906176 1024K ok
/dev/sdb1 65536 64K ok
Run virt-alignment-scan without any I<-a> or I<-d> options to scan all libvirt domains.
# virt-alignment-scan
F16x64:/dev/sda1 1048576 1024K ok
F16x64:/dev/sda2 2097152 2048K ok
F16x64:/dev/sda3 526385152 2048K ok

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Source string added

  1. libguestfs
  2. libguestfs-docs-master
  3. English
virt-alignment-scan [--options] -d domname

3 years ago
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String information

Source string description
type: verbatim
Flags
no-wrap, read-only
Source string location
align/virt-alignment-scan.pod:7
String age
3 years ago
Last updated
a year ago
Source string age
3 years ago
Translation file
po-docs/libguestfs-docs.pot, string 4