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тАО03-15-2011 10:18 PM
тАО03-15-2011 10:18 PM
Alignment of vxfs filesystem in a LUN
Hi,
I have hints that the mapping of blocks of a vxfs filesystem in a LVM lvol/vg is misaligned to the block mapping on my storage system.
So I need to know the physical layout of a vg/lvol/filesystem in a LUN. Is there a tool available to check the starting block of the filesystem in the LUN? How can I influence the starting block of a vxfs filesystem in a lvol/vg?
Other usefull hints for me to investigate further in this topic?
Thanks in advance for your help.
Best Regards
Walter
I have hints that the mapping of blocks of a vxfs filesystem in a LVM lvol/vg is misaligned to the block mapping on my storage system.
So I need to know the physical layout of a vg/lvol/filesystem in a LUN. Is there a tool available to check the starting block of the filesystem in the LUN? How can I influence the starting block of a vxfs filesystem in a lvol/vg?
Other usefull hints for me to investigate further in this topic?
Thanks in advance for your help.
Best Regards
Walter
2 REPLIES 2
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тАО03-16-2011 01:27 AM
тАО03-16-2011 01:27 AM
Re: Alignment of vxfs filesystem in a LUN
Hi,
there are two kinds of LVM disk layouts, one for boot disk and other for others LVM disks.
bootable disk ( PVRA,VGRA, and a sector for BDRA)
non-bootable disk : has two area PVRA,VGRA
So,
Information about the LVM disk data structures in the BDRA is maintained with the lvlnboot and lvrmboot commands.
# lvlnboot -v
Check this link for more information:
http://docstore.mik.ua/manuals/hp-ux/en/5992-4589/ch01s06.html
To check file system there's 'fsck' (to check coh├Г┬йrence of your file system)
But i dont know about start block , and there's the syntax to check alla file system:
#fsck -F vxfs -o full /dev/vg??/rlvol??
***Running fsck on mounted filesystems is not recommended
I hope that helps you
Best regards,
there are two kinds of LVM disk layouts, one for boot disk and other for others LVM disks.
bootable disk ( PVRA,VGRA, and a sector for BDRA)
non-bootable disk : has two area PVRA,VGRA
So,
Information about the LVM disk data structures in the BDRA is maintained with the lvlnboot and lvrmboot commands.
# lvlnboot -v
Check this link for more information:
http://docstore.mik.ua/manuals/hp-ux/en/5992-4589/ch01s06.html
To check file system there's 'fsck' (to check coh├Г┬йrence of your file system)
But i dont know about start block , and there's the syntax to check alla file system:
#fsck -F vxfs -o full /dev/vg??/rlvol??
***Running fsck on mounted filesystems is not recommended
I hope that helps you
Best regards,
BCS SW/HW GSC Engineer (L1)
IEEE Student Member
LPI 3 CORE & High Availability
VCP Vshpere 5 Datacenter
Novell CLA and Data Center specialist Certified
.....
Microsoft Partner & Microsoft student Partner
IEEE Student Member
LPI 3 CORE & High Availability
VCP Vshpere 5 Datacenter
Novell CLA and Data Center specialist Certified
.....
Microsoft Partner & Microsoft student Partner
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тАО03-16-2011 02:11 AM
тАО03-16-2011 02:11 AM
Re: Alignment of vxfs filesystem in a LUN
Hi,
Sorry,
Please try to give us the output that u used to know that ur vxfs isn't aligned .And more about (fsck)
this command depend of ur HP-UX version, so try ( # uname -a )
#vgdisplay -v /dev/vg??
to check ur vg ?? configuration
# fsck -F vxfs -o full /dev/vg??/rlvol??
This command let to check ur vxfs
and there's an exemple of output:
"""""
#fsck -F vxfs -o full /dev/vgpd/lvexp
log replay in progress
pass0 - checking structural files
pass1 - checking inode sanity and blocks
pass2 - checking directory linkage
pass3 - checking reference counts
pass4 - checking resource maps
OK to clear log? (ynq)y
set state to CLEAN? (ynq)n
sanity checks/updates have not been completed - restart? (ynq)y
pass0 - checking structural files
pass1 - checking inode sanity and blocks
pass2 - checking directory linkage
pass3 - checking reference counts
pass4 - checking resource maps
OK to clear log? (ynq)y
set state to CLEAN? (ynq)y
#fsck -m /dev/vgpd/lvexp
vxfs fsck: sanity check: /dev/vgpd/lvexp needs checking
""""
best regards,
Sorry,
Please try to give us the output that u used to know that ur vxfs isn't aligned .And more about (fsck)
this command depend of ur HP-UX version, so try ( # uname -a )
#vgdisplay -v /dev/vg??
to check ur vg ?? configuration
# fsck -F vxfs -o full /dev/vg??/rlvol??
This command let to check ur vxfs
and there's an exemple of output:
"""""
#fsck -F vxfs -o full /dev/vgpd/lvexp
log replay in progress
pass0 - checking structural files
pass1 - checking inode sanity and blocks
pass2 - checking directory linkage
pass3 - checking reference counts
pass4 - checking resource maps
OK to clear log? (ynq)y
set state to CLEAN? (ynq)n
sanity checks/updates have not been completed - restart? (ynq)y
pass0 - checking structural files
pass1 - checking inode sanity and blocks
pass2 - checking directory linkage
pass3 - checking reference counts
pass4 - checking resource maps
OK to clear log? (ynq)y
set state to CLEAN? (ynq)y
#fsck -m /dev/vgpd/lvexp
vxfs fsck: sanity check: /dev/vgpd/lvexp needs checking
""""
best regards,
BCS SW/HW GSC Engineer (L1)
IEEE Student Member
LPI 3 CORE & High Availability
VCP Vshpere 5 Datacenter
Novell CLA and Data Center specialist Certified
.....
Microsoft Partner & Microsoft student Partner
IEEE Student Member
LPI 3 CORE & High Availability
VCP Vshpere 5 Datacenter
Novell CLA and Data Center specialist Certified
.....
Microsoft Partner & Microsoft student Partner
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