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тАО10-07-2003 03:27 AM
тАО10-07-2003 03:27 AM
Question: What is the correct command syntax or method for stripping across the remaining 6 six using the default strip size of 8kB? Can stripping be directed at a specific set of disks that are not being used in a volume group that already has logical volumes defined? Thanks
Solved! Go to Solution.
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тАО10-07-2003 03:55 AM
тАО10-07-2003 03:55 AM
Solutionlvcreate -L 48000 -i 6 -I 8 /dev/vg03
You will need all 6 remaining disks in vg03 to have the same number of free extents, and even then 48GB may be too big, you may need to reduce it slightly. lvcreate will automatically look for 6 disks in vg03 with enough space to divide 48GB evenly over them, if not the command wont run.
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тАО10-07-2003 03:59 AM
тАО10-07-2003 03:59 AM
Re: HPUX 11.0: LVM Stripping Across Multiple Disks
Lvcreate the LV with 0 bytes and then use lvextend..Lvextend will allow u to specify the disks.
But remmeber, with LVM and Mirror-UX/DX , only extend based mirrors are possible.
If u create a LV with -i option, as far as I know, you cant mirror it.
-- Sundar.
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тАО10-07-2003 04:02 AM
тАО10-07-2003 04:02 AM
Re: HPUX 11.0: LVM Stripping Across Multiple Disks
# lvextend -L $((48*1024)) /dev/vg03/lvol2 /dev/dsk/c0t1d0 /dev/dsk/c0t2d0 /dev/dsk/c0t3d0 /dev/dsk/c1t3d0 /dev/dsk/c2t0d0 /dev/dsk/c2t1d0
Best regards...
Dietmar.
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тАО10-07-2003 05:43 AM
тАО10-07-2003 05:43 AM
Re: HPUX 11.0: LVM Stripping Across Multiple Disks
Should do it. Remember, when you do striping without mirroring or RAID5, you loose file system when you loose any of the disk.
-GK-
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тАО10-08-2003 04:52 AM
тАО10-08-2003 04:52 AM
Re: HPUX 11.0: LVM Stripping Across Multiple Disks
I agree with GK. without mirroring of somekind you are doomed... unless you take frequent backups...
On my systems with striped disks, I have them on EMC symm frames where they are H/W mirrored... so any single disk failures are irrelevant.
I would strongly recommending striping and mirroring... If you can afford it I would get 6 more disks and create striped mirrored LVol...
_________________________
If your desire is to have a performance gain by striping you will get that, however, you will be vulnerable to a single disk out of 6 biting you in the backside...
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Also, since these are internal disks, you arent going to have the latency that you would have with disks that are attached. So, I doubt that you will see much of a performance gain with this configuration especially since they are internal disks and will be using the host cache and not an external cache like a DB would have on external disks in a EMC or HP/Compaq frame.