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тАО01-08-2004 07:03 AM
тАО01-08-2004 07:03 AM
reuse 12H disk array
I have a N class server with 12H array hosting oracle databases. There are 8 LUNs for storing database data files. vg00 was created from a seagate drive and not part of the array.
I am having the task to reuse this server as a major file server. All the data can be erased. I have already backed up the whole system via ominiback. How do I deconfigure and reformat the disk array completely clean for the new purpose?
umount file system, deactivate volume group and vgexport, then delete the LUNs and then recreate LUNs and then vg and then lvols?
If anyone can give a detailed procedure, that would be very helpful for me who never refomated 12H disk array before.
Thanks.
Jane
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тАО01-08-2004 04:23 PM
тАО01-08-2004 04:23 PM
Re: reuse 12H disk array
If I understand your config right, then yes, that sounds fine. I don't believe there's any need to delete/recreate the LUNs, though. If the VGs are okay, you don't even need to delete those -- you can just unmount, lvremove, and then recreate the lvols/fs that you want. I'm assuming you don't need any actual reformatting of these drives.
It sounds like you have a good grasp of things, but let me know if you want more details.
Mic
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тАО01-09-2004 06:31 AM
тАО01-09-2004 06:31 AM
Re: reuse 12H disk array
Thanks for the reply.
The maximum number of LUNS is reached, So I do not need to delete all 8 LUNS and only recreate 5 or 6 to increase performance?
Some of the LUNS are created with smaller capacity, and my new file system will take more space, how to do with this?
If I do not do deletion and recreate the LUNS. Everything is clean?
Please confirm with this.
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тАО01-09-2004 06:48 AM
тАО01-09-2004 06:48 AM
Re: reuse 12H disk array
Use arraydsp -i to get the ArrayID
then to delete a LUN,
arraycfg -L LUN -d ArrayID where LUN is 0-7
to create a new LUN
arraycfg -L LUN -a size -V ArrayID where size is specified in MBytes
Man arraydsp, arraycfg for details.
Note that the 12H is a High-Voltage Differential (HVD) SCSI device only. Make certain that you use HVD SCSI controllers in your N box.
For best performance, allocate each volume group as 2 equally sized LUN's. LUNA's primary pathy should be through controller X (alternate Y) and LUNB's primary path should be through controller Y (alternate X). You then stripe each LVOL in this VG across both LUNs --- typically using a 64KB stripe size.
This will fully utilize both external SCSI busses and all four internal SCSI buses.
As I said earlier, leave as much space unused /unallocated as possible --- if you can stay under 50% allocation, all of the 12H will be RAID 1/0.
If you follow these rules, you will be pleasantly surprised at how well these old gals will perform.
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тАО01-12-2004 07:02 AM
тАО01-12-2004 07:02 AM
Re: reuse 12H disk array
we have 2 autoraid 12h running Oracle production for 4 years. As Clay states, unless you can keep 50% or so free disk you may have some performance issues as we have over the years. We offloaded Oracle DB redo/archive logs to jbod raid 1 sc10's with hpux mirrordisk and saw good improvement as our 12h's filled up.
Also, we saw some scsi lbolts in syslog for the 12'hs and had to set the pv timeout to 180 - for example:
pvchange -t 180 /dev/dsk/cxtxdx
We also went down to 2 big LUNS per 12H with no problem.
I agree the 12h's have been workhorses,but
if this is production though and speed is a major issue make sure to have lots of free disk space.
We are finally going to buy (i hope) an eva3000 fibre attached solution.
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тАО01-12-2004 11:48 AM
тАО01-12-2004 11:48 AM
Re: reuse 12H disk array
I am now wondering if it is necssary to delete LUNS and recreate them again if I have the option just do at LVM level ( vgexport then vgcreate and then /etc/fstab )and then just move new file over?
Please let me know if I can just do this.
As for performance, I saw all the LUNs are allocated.
Jane
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тАО01-13-2004 03:15 AM
тАО01-13-2004 03:15 AM
Re: reuse 12H disk array
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тАО01-13-2004 05:11 AM
тАО01-13-2004 05:11 AM
Re: reuse 12H disk array
i agree with Clay - you must use the arraycfg method to deallocate and reallocate the luns. Just doing VG movement is not enough. The only way to free disk up and have it usable as raid1/0 is to reconfig the array. I believe once Autoraid 12H space is written to it becomes Raid5 forever even after files are deleted, unless arracfg is used to reset them.
Mark
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тАО01-13-2004 06:33 AM
тАО01-13-2004 06:33 AM