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тАО09-05-2001 07:29 AM
тАО09-05-2001 07:29 AM
I am trying to increase the performance of my autoraids.
I ran the following to get a recombination of what changes I should make:
(hostname)root# arraydsp -r 09041200 09041700 arraysn
Vendor ID = HP
Product ID = C3586A
Array serial number = arraysn
Performance Recommendations (12:00 09/04/2001 to 17:00 09/04/2001):
--------------------------------------------------------------------------------
Add another disk array because the write working set is too large.
The number of write I/Os being performed by the host on a daily basis
is consistently exceeding the amount of RAID1 space available to service
them. This results in decreased performance because some writes must be
serviced from RAID 5 space. Adding another disk array to increase the amount
of available RAID1 space should improve performance.
--------------------------------------------------------------------------------
Unfortunately the way my autoraids are setup they have the whole LUN using all of available disk space so there is no raid 0/1, as arraydsp ?a arraysn shows:
Raid 0/1 capacity = 0 MB *
I also notice that arraydsp ?a shows:
Write Cache = DISABLED
Read Cache = DISABLED
The arrays are at firmware version HP25.
All the disks are used and allocated to the LUN as I mentioned. To increase raid 0/1 should I try replacing some of the 4GB drives with larger drives to give me some disk space beyond what is allocated to the LUN? How much will help with performance?
I did a ?sar ?b? and it shows 100% for %rcache and 92% for %wcache. Does this indicate I should make some change to the kernel?
Thanks!
- Justin
Solved! Go to Solution.
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тАО09-05-2001 07:51 AM
тАО09-05-2001 07:51 AM
Re: AutoRAID Performance
For Autoraids, you are supposed to set up multiple LUNs for optimal performance. One of the ways to get that performance is if you have dual controllers. You can set the paths to different LUNs over exclusive controllers.
But, if you have all 12 disks in the case, AND they are all 4 gig, and all used, then you should probably upgrade to 9 gig (if you can find them) or 18 gb. While you may not need the space, you can leave the space unallocated, and then take advantage of RAID 0/1.
I attached the output of my "arraydsp -a". Note that I only have 5 disks, (grrr, stupid economy), but I didn't allocate all of my space so that I can still use 0/1.
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тАО09-05-2001 07:58 AM
тАО09-05-2001 07:58 AM
Re: AutoRAID Performance
I will look into the 18 drives and see how much they cost.
- Justin
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тАО09-05-2001 08:00 AM
тАО09-05-2001 08:00 AM
SolutionThe bad news is that you've broken just about every rule for good AutoRAID performance. The read cache and write cache DISABLED messages
is not a problem. This only indicates the status of the caching as it appears to the outside world (i.e. the host); internally caching is always enabled. Changing this value will have no real effect. From the Product ID returned by arraydsp it looks as though your are running a Model 12 rather than a 12H. If my poor memory serves, 4GB's were the largest disks that the Model 12's supported. If you've got 12H's then you can install 36GB's. At the very least, to see any real improvement you need to install 4 new drives and morew would be better.
The other thing you must do is utilize both controllers. You are really only using one now.
The ideal setup is to actually setup each volume group as a pair of equally sized LUN's.
LUNa's primary path should be through controller X (alternate Y) and LUNb's primary path should be through controller Y (alternate X). You then stripe all lvols within that volume group across both LUN's in 64K chunks.
This will fully utilize both controllers and all four internal scsi buses. The other key
to performance is to use no more than about 60% (less is better) of the space as configured LUN's - this keeps everything in RAID 0/1 and AutoRAID performance can then be quite good.
The good news is that Model 12H's and drives are now dirt cheap on the used market.
Regards, Clay
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тАО09-05-2001 08:29 AM
тАО09-05-2001 08:29 AM
Re: AutoRAID Performance
You are right it seems that the 12 does not support drives larger then 4.3GB. We have on 12H but that is in another system that is not a production system and that is running fine.
We are likely going to be moving the data from the AutoRAIDs to an IBM ESS (Storage Area Network) server with in a year. I was just trying to figure out a way to increase performance until then, as the disk I/O to that AutoRAID's is very very high and according to GlancePlus a problem.
- Justin
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тАО09-05-2001 09:07 AM
тАО09-05-2001 09:07 AM
Re: AutoRAID Performance
Backup
Reconfigure autoraid
Restore
Clay has posted some good threads on autoraid configuration. I suggest doing a search on autoraid. You should find everything you need.
..jcd...
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тАО09-05-2001 09:35 AM
тАО09-05-2001 09:35 AM
Re: AutoRAID Performance
I have the 12H and yes, I just found that refurbished drives are falling under $700 for 9 GB.
If you do use your 12H, remember that you should always add drives of the same size to minimize wasted space in the RAID 0/1 arrangement.
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тАО09-05-2001 09:47 AM
тАО09-05-2001 09:47 AM
Re: AutoRAID Performance
It is not as bad as it sounds. We do have two controllers and two AutoRAIDs. The AutoRAIDs are a mirror of each other and each has both controllers connected to each of them, one uses one controller as the primary and the other uses the same controller as the secondary. So one AutoRAID uses X and the other uses Y, but they should be able to use the one not being used if they have to. We should be able to lose a whole controller or AutoRAID and be ok. It would be better if each AutoRAID had two controllers to itself and had at least two LUNs but they don?t.
- Justin
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тАО09-06-2001 12:11 AM
тАО09-06-2001 12:11 AM
Re: AutoRAID Performance
Regarding the AutoRAIDs being a mirror of each other, do you really expect simultaneous multiple failure? You may as well just do it right and get an XP48 solution. You're talking fibre channel and fibre channel disks.
You're still sending out multiple writes with mirror disk, you may consider using fc adaptors to increase performance on the HBA side.
Bill
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тАО09-06-2001 02:09 AM
тАО09-06-2001 02:09 AM
Re: AutoRAID Performance
I have been involved in an Oracle Application 11 integration project with a limited budget.
We started with 2 AutoRAID 12H and we got poor response time. We tried to escalate this issue and got replies telling : technology bound ! So we changed our AutoRAID 12H to 2 FC10 racks, for a replacement within the same cost. We got 200% to 400% performance improvement immediately !
Searching for an advice ? change technology
Regards