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тАО01-15-2002 08:12 AM
тАО01-15-2002 08:12 AM
- will both the sc10 array and the mirrordisk software play well with the mixed drive sizes?
- it appears the mirrordisk consumed almost 1gig on each drive (sam reports them as 17.3 gig). is this normal?
- does hp have a whitepaper on mirrordisk? I did a search but could not find one
thanks
mark
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тАО01-15-2002 08:24 AM
тАО01-15-2002 08:24 AM
Re: mirrordisk and sc10 array
This document will give you an idea about Mirroring using LVM:
http://www.docs.hp.com/hpux/onlinedocs/B2355-90672/B2355-90672.html
Shiju
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тАО01-15-2002 08:57 AM
тАО01-15-2002 08:57 AM
SolutionIf this is not the case, do as follows:
For each lvol in the vg:
lvreduce -m 0 [lvol name] [diskname]
Then remove the first disk from the vg:
vgreduce [vgname] [diskname]
Add the new disk to the vg:
pvcreate [newdiskname]
vgextend [vgname] [newdiskname]
recreate the mirrors for each lvol:
lvextend -m 1 [lvolname] [newdiskname]
After this do the same for the second old disk and second new disk.
Good luck,
Mark
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тАО01-15-2002 09:01 AM
тАО01-15-2002 09:01 AM
Re: mirrordisk and sc10 array
As far as the SC10 is concerned I think the disks rae hot swappable.
However, you will have problems with LVM. Even though the disks are twice as large you probably will not be able to see the extra as the volume group was set up wityh 18GB disks.
However, If the disks you want to swap out are a mirrored pair and no LV's are shared with other disks (e.g. extent based stripes, etc).
o replace each disk one at a time so the mirroring can take place. check for stale extents with pvdisplay.
o vgreduce one of the mirrored pairs. Then create a new VG & put it in there.
o create the LV's in the new VG with the same sizes as on the old disk LV's.
o Stop all you apps using the LV that will be effected. copy the contents of the old to new LV's dd if=/dev/vgold/lvolXX bs=1024k of=/dev/vgnew/lvolXX
o edit /etc/fstab (if req) to point at new VG/LV
o start up apps
o Finally lvremove the old LV's & vgreduce the old disk out. pvcreate it & add into the new VG. mirror up.
DONE
If you use extent based striping, you are stuffed for a quick fix. You'll need to recreate the whole volume group from scratch.
o stop apps
o level 0 of all the VG's filesystems & databases
o save VG size & config info, vgdisplay -v
o vgexport vgold
o pvcreate all the disks
o vgcreate/vgextend all the disks onto the new VG. It will probably change some of the default VG parameters like "MAX PE per PV" or you may need to increase "PE Size" to 8MB
o restore info
o start up apps
Both of the above should be done with all the applications stopped at some point, it may be possible to get 'round this by using "your skill & judjement".
Tim
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тАО01-15-2002 09:25 AM
тАО01-15-2002 09:25 AM
Re: mirrordisk and sc10 array
Again, while you mirror the disks, if you have two controllers in the SC10, then configure the mirror with seperate controllers. That means two disks in the same controller and the mirror disks in the other.
Becuase, if you have 2 cotrollers, you can access all HDD with two different links ( check the full-bus/split-bus configuration). And this will improve the performance too.
HTH,
Shiju