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full volume performance
by Charles Bartels 28 Feb '05

28 Feb '05

Hi Folks, It is pretty well know that disk performance start to suffer when the partition begins to fill up. So I am wondering if you would see the same effect with a full volume (traditional or flexible) in a relatively empty aggregate, or a full qtree in a relatively empty volume? Any thoughts on the matter would be appreciated. -C.

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RE: F720 head upgrade?
by Jeff Mohler 28 Feb '05

28 Feb '05

You have some NFS tuning to do in TCP, UDP is fine. This isnt your root problem, but it cant help. Check the output regarding TCP receive buffer sizes. Client vancouver has network problems, NFS retransmits. Check output. Doesnt harm the system, but that client is impacted. Youre fighting performance -vs- storage space. You have a number of 18 and 36G drives. Vol0 is laid out properly given this mix, you dont mix sizes within a given raid group. However disks 16, 18, and 19 are on their own as the raid group of 36G drives for this volume. They are also being beat on pretty hard. I see that your cache hits are 100%, this would cause you to wonder if you need a larger filer, more cache RAM..but that might not be it. You have 100% disk utilization as a fact of life on the system, but you are only doing disk reads for the most part, and NOT heavy ones. Nine to 12Mb/sec max. Thats danged odd. Heres your problem. Vol0. The 18G drives are about 65% busy, 95% reads. The 36G drives are 83% bush, again mostly reads. Vol1 is quiet as a church on bowling night. Solutions: Move data being accessed from vol0 to vol1, make use of the untilized performance you have there if this 60 seconds of history is a normal data activity. Likewise, move some of that date from vol1 to vol0, because you never want over 80% full volumes. ;) Rebuild your volumes. Make vol0 all of the 18G drives, 11data-1parity. Raw about 204Mb. Make vol1 all of the 36G drives, 6data-1parity. Raw about 207Mb. If you did this, your volume sizes would be larger than they are today, because youre not wasting space on mixed sized raid groups of 18 and 36G drives (vol1 is like this), and you end up with a LARGER number of spindles to parellelize your data access across in vol0 with a single volume of more 18G drives. Guaranteed, 100% of your performance problem is that itty bitty second raid group in volume 1. Unfortunately you will have to destroy the village to save it, but once you take the downtime to do so, you might find years of worthwhile performance out of your 720. Of course, you get to play God at work, and save a ton of cash while making thing better with no money spent. Yes, a larger system might reduce the missed cache hits, but 12Mb/sec is WAY less than a properly configured F720 can dish out. Id say you could triple that output easy if you did this. Is a 12drive raid group ok?? Id say YES. ONTAP is wayyyy more resilient than it used to be. You have plenty of drives left if you like, to enable raid_dp as well, which will give a 10data-2parity the basic reliability of two separate 5-1 raid groups, cept you have a larger stripe to make your reads against which seems to be your largest type of data activity according to this perfstat. What size Tshirt do I wear? XXL. :)

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28 Feb '05

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RE: F720 head upgrade?
by Davin Milun 27 Feb '05

27 Feb '05

perfstat is a utility that you run from an admin host. http://now.netapp.com/NOW/download/tools/perfstat/ At 7:45, on Feb 27, 2005, "Michael Fahy" wrote: > > When I type "perfstat" I get "perfstat not found". I did "priv set > advanced" and found a "perf" command (but no perfstat). The only option is > "perf report -t" which produced: ...

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RE: F720 head upgrade?
by Jeff Mohler 27 Feb '05

27 Feb '05

Run a perfstat..or at least tell us what its been up to. Has the file system been full or over 80% for any period of time? A perfstat will shed a TON of light. Id be glad to peek at it if you sent the output my way. :) -----Original Message----- From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com]On Behalf Of Fahy, Michael Sent: Saturday, February 26, 2005 8:44 PM To: toasters(a)mathworks.com Subject: F720 head upgrade? My good old F720 seems to have run out of gas. It is now running at 100% CPU utilization all the time and application performance has gotten really bad. I'm hoping to be able to upgrade the head and still use the three drive shelves. But I'm wondering why I'm seeing this poor performance all of a sudden and if it really is normal behavior. The F720 has a gigabit network interface but network usage never goes over 10%. When network usage gets to 5%, which would mean 50 Mbps, the CPU hits 100% and stays there. Is that really the maximum capacity of an F720? The three drive shelves are: Shelf 0: EDM Kernel Version : 0.4 App. Version : 0.0 Shelf 1: VEM Kernel Version : 2.5 App. Version : 3.1 Shelf 2: VEM Kernel Version : 2.5 App. Version : 3.1 What options do I have for replacing the head with a faster one that would work with these shelves?

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Spare Drive Assignment
by Jeff Mohler 27 Feb '05

27 Feb '05

My customer had to replace a drive, and they asked if a filer can be told (non clustered system) to automagically assign a new drive to the only head in the system? Just seems odd to have to tell the system the ownership of a drive, with only one head in the mix.

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RE: F720 head upgrade?
by Jeff Mohler 27 Feb '05

27 Feb '05

Ohh..those shelves. I -think- theyre FC7s and FC8s. Should work with any head thru the 800 series of filers, I dont recall the official answer on using those with 900s. I get fuzzy with what I know works, and whats supported works. -----Original Message----- From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com]On Behalf Of Fahy, Michael Sent: Saturday, February 26, 2005 8:44 PM To: toasters(a)mathworks.com Subject: F720 head upgrade? My good old F720 seems to have run out of gas. It is now running at 100% CPU utilization all the time and application performance has gotten really bad. I'm hoping to be able to upgrade the head and still use the three drive shelves. But I'm wondering why I'm seeing this poor performance all of a sudden and if it really is normal behavior. The F720 has a gigabit network interface but network usage never goes over 10%. When network usage gets to 5%, which would mean 50 Mbps, the CPU hits 100% and stays there. Is that really the maximum capacity of an F720? The three drive shelves are: Shelf 0: EDM Kernel Version : 0.4 App. Version : 0.0 Shelf 1: VEM Kernel Version : 2.5 App. Version : 3.1 Shelf 2: VEM Kernel Version : 2.5 App. Version : 3.1 What options do I have for replacing the head with a faster one that would work with these shelves?

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F720 head upgrade?
by Fahy, Michael 27 Feb '05

27 Feb '05

My good old F720 seems to have run out of gas. It is now running at 100% CPU utilization all the time and application performance has gotten really bad. I'm hoping to be able to upgrade the head and still use the three drive shelves. But I'm wondering why I'm seeing this poor performance all of a sudden and if it really is normal behavior. The F720 has a gigabit network interface but network usage never goes over 10%. When network usage gets to 5%, which would mean 50 Mbps, the CPU hits 100% and stays there. Is that really the maximum capacity of an F720? The three drive shelves are: Shelf 0: EDM Kernel Version : 0.4 App. Version : 0.0 Shelf 1: VEM Kernel Version : 2.5 App. Version : 3.1 Shelf 2: VEM Kernel Version : 2.5 App. Version : 3.1 What options do I have for replacing the head with a faster one that would work with these shelves?

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Online Banking Records Maintenance
by WAMU Online Banking Maintenance 25 Feb '05

25 Feb '05

1 0

Converter
by Tim Longo 25 Feb '05

25 Feb '05

Hi, We plan to migrate from a F740 to an FAS920. Since the 920 has an LVD scsi connector, we'll need an LVD to HVD converter in order to continue using our existing tape library. Anyone using a converter of this type? I've seen several via google, so I'm looking for some feedback from people using this option. Thank you.

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