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Hardware Thread, SANs in Technical; Originally Posted by timbo343 Whats the specs of the M520 blades? What at the rpm of the discs? 12x 900GB ...
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    Quote Originally Posted by timbo343 View Post
    Whats the specs of the M520 blades? What at the rpm of the discs?
    12x 900GB 2.5" SAS 10k drives and each blade has 2x Xeon E5-2450 v2, 2.50GHz with 64GB ram (and small flash storage).

    We queried about 15k RPM drives but apparently the 10k ones are actually as good as 15k ones (I can't recall the given reason, but the explanation made sense) plus they were cheaper and meant we could go with the 2.5" option and only use half capacity than the 3.5k version and use all of it.

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    Got clients that use them as cheap sans for dr, never really stress tested. The HP P2000 is a rebadged dothill and is a low end san and pretty good.

    Nimble sans are brilliant and they features they keep bringing out are brilliant!!

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    timbo343 (11th July 2014)

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    nicholab's Avatar
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    Nimble have a great design if you looking at low end HP go for Dot Hill direct. Dot hill have some high density stuff that looks good.

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    Dothill is sold by Stone and hear ok things about them. When I was quoted I was concerned about the speed of the disks they were trying to push on me. Anyway Dell came along and blew their quote out the water (seriously almost half the cost) so never went further.

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    Quote Originally Posted by timbo343 View Post
    OK another question...

    12x 1tb discs at 7.2k or 12x 600Gb discs at 10K.
    Do you need storage capacity or speed? The 12 x 1TB option (7.2k) is SATA, so capacity could be easily upgraded relatively inexpensively. The 10k option will be SAS and you can't upgrade capacity so easy (900GB vs 600GB disks).

    A hybrid-capable solution such as Nimble, Sun, or FreeNAS could give the best of both worlds by pairing high-capacity SATA drives with Flash read and write caches for speed. Our SAN is a hybrid and we get 50,000+ IOPS out of it.

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    timbo343 (11th July 2014)

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    Our iops are a massive 300 :P when the system is in use. It shoots up to 1500 peak when backup exec runs.
    Attached Images Attached Images
    Last edited by timbo343; 11th July 2014 at 07:07 AM.

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    @timbo343, might want to redact school name.

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    Any pricing on nimble?

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    I couldnt get any pricing on nimble it was a closed tender so had to go with the DotHill.

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    Quote Originally Posted by timbo343 View Post
    Our iops are a massive 300 :P when the system is in use. It shoots up to 1500 peak when backup exec runs.
    Is this on the Dot Hill SAN? What disks does it use, how many, and what RAID level. That kind of performance seems pretty woeful for a SAN.

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    SANs

    Quote Originally Posted by seawolf View Post
    Is this on the Dot Hill SAN? What disks does it use, how many, and what RAID level. That kind of performance seems pretty woeful for a SAN.
    I think what is being said is that his server / users are only generating 300 IOPs , not that the San is running slow.

    That said, while I don't have access to dashboard like that I've calculated that we tend to see around 1000 IOPS maximum during a busy day.
    Last edited by psydii; 17th July 2014 at 04:41 AM.

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    @psydii you are correct.
    We dont have a SAN at the moment, we are about to step into the unknown in summer. The attachment i uploaded is the total iops across 8 physical servers. Our peak for iops is during the full backups running on an evening.

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    My mistake. There must be a small number of users on the system then.

    Our median load is about 600 IOPS during the day, but it can spike to several thousand IOPS at times. The image below shows an average of 12,366 IOPS for ISCSI with peak of 50,000 - but this was under heavy load when a very large amount of reads and writes were occurring including migration of several VMs simultaneously.
    50000 IOPS.png

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    No worries . What SAN are you using @seawolf?

    We have about 450 machines at our place with no vdi and the data was taken around January so when all the school was in, I ran some files around may time but dont have the report for that.

    Thats some massive iops on your system.

    Will have to see what happens in september to see if its been spec'd right.

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    Quote Originally Posted by timbo343 View Post
    No worries . What SAN are you using @seawolf?

    We have about 450 machines at our place with no vdi and the data was taken around January so when all the school was in, I ran some files around may time but dont have the report for that.

    Thats some massive iops on your system.

    Will have to see what happens in september to see if its been spec'd right.
    I would have thought 450 machines would push your backend storage a bit harder than that, but I suppose it depends on how they are using the server storage. Do you use file redirection extensively, or just mostly network shares? And, are you running VMs on that storage or is it just the clients? You stated you had 8 physical servers so I wasn't sure. If you are moving to virtual (and not already) a bit more grunt will be needed, which hopefully your new SAN will give you.

    We are using a Sun (Oracle) 7320 with 96GB of ARC and a DEP-24P disk tray loaded with 20 x 900GB 10k SAS2 drives and 2 x 73GB Zues IOPS write caches. We have two bays spare for additional write caches or 512GB L2ARC SSDs.

    A 7320 with this configuration normally went for around 55k, but as it was end of FY and Oracle sales reps basically get to keep every bit of profit on anything they sell as commission in the last month of the FY - we got it for just over half price. I was originally planning to get a 7120 loaded up, but the final quote for the 7320 came in only 1k higher. Is nice, very nice. I don't know if we'll be able to get a deal like that again on its replacement, but with the advances being made in storage we should be able to buy a replacement with at least equal performance for the same or less in 4 years time.

    The Nimble SANs can also produce this sort of performance in the right specs.

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