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тАО08-16-2007 12:00 AM
тАО08-16-2007 12:00 AM
Solved! Go to Solution.
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тАО08-16-2007 06:06 AM
тАО08-16-2007 06:06 AM
Re: XP12000 formatting takes long time
My experience says that the formatting from the CVXP is always slower than the formatting done from the SVP (during the HW installation). If the disks are totally free and this is the first LUN you are formatting on the Arraygroup then it would be better if you can De-install the AG and re-install (with the help of HP engineer) and format the LUNs at the same time.
I haven't seen anything taking more than 24 hrs but 70Hrs is too much to handle. You may ask HP to review your configuration if you have any hot spot in your XP12000.
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тАО08-17-2007 02:06 AM
тАО08-17-2007 02:06 AM
Solution500/18 = 27.7
27.7x2.5=69
Close enough.
Might be worth asking your CE about mode 269 (I think thats the mode) which brings RWC format times into line with SVP times.
Hope this helps
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тАО08-17-2007 02:39 AM
тАО08-17-2007 02:39 AM
Re: XP12000 formatting takes long time
You are talking about 18GB which was last supported on XP152. Knowing the differences between the XP generations and fast formatting of Hitachi disks over Seagate disks (due to onboard CHIP integration on Hitachi disks) is likely to fade you out from debate. All I suspect is the load on XP or something to do with microcode. Please check with HP about it and make sure you are not running legacy microcode.
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тАО08-17-2007 06:30 AM
тАО08-17-2007 06:30 AM
Re: XP12000 formatting takes long time
I was not clear, this is on a XP12K/USP with very recent MC. I was cutting 18GB LDEVs. Some were RAID10 on 146GB 15K spindles and some were RAID5(3+1) on 300GB 10K spindles.
It was taking 2.5 hours to cut an 18GB LDEV!!
Nigel
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тАО08-17-2007 09:18 PM
тАО08-17-2007 09:18 PM
Re: XP12000 formatting takes long time
146 DKSxxx Seagate
300 DKRxxx Hitachi
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тАО08-22-2007 08:28 AM
тАО08-22-2007 08:28 AM
Re: XP12000 formatting takes long time
Just FYI, our firmware version is 50-07-51 (we├в ll install the new version next month), but I do not expect a great formatting time improvement by this upgrade.
Also as you stated in you replays some configuration issues may help for a faster formatting (or seems so). For instance, our first cuts were 200GB, 200GB and 100GB (total=500GB) all on the same Array Group; after you comments, we define the same cuts (200GB, 200GB and 100GB), but one of the 200GB cuts in a different Array Group; the formatting time then, took about 50 hours, and not 70. We are not sure if is a direct consequence of the change or a variation of the I/O activity.
Again, based on you experience, and assuming that we├в ll not reduce formatting time to a couple of hours, do you have a strategy to reduce the time between a user├в s storage space requirement and the delivery time of this space to the user. For instance, pre-creating pools of cuts of fixed sizes, and then when a user asks for space, build a LUSE with these cuts, avoiding by this way, the formatting time.
Your suggestions and creative ideas will be appreciated.
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тАО08-22-2007 09:30 AM
тАО08-22-2007 09:30 AM
Re: XP12000 formatting takes long time
Having a small number of common LUN sizes also helps in a tiered storage environment and when performing ad hoc migrations (as these array based technologies require source and target volumes to be exactly the same block size).
It is a very bad idea to have lots of different LDEV siezes on an XP for tiering and other migrations.
Also, if you are formatting all of the space on a Parity Group then have your engineer come on site to pull and re-install the Parity Group as he is able to format the space much quicker from the SVP.
Also ask you engineer about the mode setting which I mentioned in a previous post as this may speed up format times.
Hope this helps
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тАО08-29-2007 09:05 AM
тАО08-29-2007 09:05 AM
Re: XP12000 formatting takes long time
Despite of this, we'll open a ITRC case to get,may be, a more in detail explanation of this behavior, and ask for a correction to reduce formating time,if it is not an engineering limitation issue.
By this message, I am closing this thread. Thank you.
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тАО08-30-2007 04:04 AM
тАО08-30-2007 04:04 AM
Re: XP12000 formatting takes long time
In my previous post what I meant by cutting the LUNs during the Array Group installation is that to determine the need in advance and cut the desired LUNs while installing AGs. Not meaning that you cut several small LUNs (say 15GB) and then LUSE them to make bigger LUN sizes.
Whatever it is, with current trend of slow formatting on CVXP this gives us indication to plan very well in advance.