Ernst Bachmann
2005-Sep-27 16:46 UTC
[Xen-users] Re: With regard to questions on xen-dev about memory and disks
On Tuesday 27 September 2005 18:21, you wrote:> With regard to questions on xen-dev about memory and disk, > i saw the following advert: > > http://www.hyperossystems.co.uk/07042003/products.htm#hyperosHDIIproduct > > in short it''s a 5 1/4" bay you can put in RAM dimms and use them as a > harddrive. > It has reboot-memory and 160-minutes-power-off memory. > > They advert it at 80x faster than harddisk so, as swap space, or tmp-space > on domU (proxy-cache, mail/spam/virus handling etc etc etc) it would be > maybe worth the investment. What do you guys think? >All in all nice features, but: 80x faster can only apply to seek time, the bulk transfer rate would be limited by the ide (or SATA) interface, even with SATA-II it would max out at 300something MB/second. While seek time is important for swap speed, I think the memory would be more usefull on-board (with 64bit access or PAE) (BTW, thats basically what PAE does: it uses the memory beyond the CPU''s 32bit address limit as "fast swapspace") Maybe an option if your mainboard/CPU are maxed out RAM-wise, otherwise invest in 4 fast sata-drives, put a swap partition on each (with same priority, so its striped) and you''d get about the same bulk transfer speed for the same price + hundreds of gb additional storage space for free... /Ernst _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users