The server has 12GB of RAM. This is the output of zpool iostats: sonicle@xstreamserver:~$ zpool iostat -v data capacity operations bandwidth pool alloc free read write read write ---------- ----- ----- ----- ----- ----- ----- data 659G 1.39T 23 37 1.12M 306K raidz2 659G 1.39T 23 37 1.12M 306K c1t0d0 - - 7 13 236K 108K c1t1d0 - - 7 13 236K 108K c1t2d0 - - 7 13 236K 108K c1t3d0 - - 7 13 236K 108K c1t4d0 - - 7 13 236K 108K ---------- ----- ----- ----- ----- ----- ----- Gabriele Bulfon - Sonicle S.r.l. Tel +39 028246016 Int. 30 - Fax +39 028243880 via Santa Maria Valle 3 - 20123 - Milano - Italy http://www.sonicle.com ---------------------------------------------------------------------------------- Da: Bob Friesenhahn A: [email protected] Cc: [email protected] Data: 15 gennaio 2013 16.22.17 CET Oggetto: Re: [discuss] Suggestions for an XStreamOS/illumos based server upgrade On Tue, 15 Jan 2013, Gabriele Bulfon wrote: The new disks we've been offered have two different options: 1- SAS 600GB 15,000RPM disks 2- SAS 900GB 10,000RPM disks Obvioulsy, the first option let us double the available space, mantaining same disks performance. The second one let us triple the available space, lowering down 1/3 of disks performance. What would be your choice? How much RPM will affect my XStreamOS/illumos based cloud server? You did not say how much RAM the system has. With sufficient RAM, the server will only read when it first initializes (or on first access) and after that, the disks will primarily see writes. More RAM reduces IOPS requirements by reducing reads. The 15k disks have less rotational latency (good for transactions) but they probably don't offer any more sequential throughput since they have less storage density. If you have an already working system, then you can see how many IOPS are already being consumed (including synchronous writes) and have some idea of the necessary IOPS capacity of the system. Bob -- Bob Friesenhahn [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175541-02f10c6f Modify Your Subscription: https://www.listbox.com/member/?&id;secret=21175541-29e3e0ee Powered by Listbox: http://www.listbox.com
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