Thanks! Which File System do you have on your SSD, if I may ask ?
DS On Sun, Dec 30, 2012 at 8:46 AM, shimi <linux...@shimi.net> wrote: > > > > On Sun, Dec 30, 2012 at 6:26 AM, Dan Shimshoni <danshi...@gmail.com> wrote: >> >> Hi, >> >> 2 Questions about SSD drives: >> >> First, I would appreciate of someone who has SSD disk will >> run >> hdparm -t /dev/sda >> and post the results here. (In the spirit of the recent thread about >> HW for linux). >> >> I have >> /dev/sda: >> Timing buffered disk reads: 586 MB in 3.01 seconds = 194.68 MB/sec >> And it interests me to compare results >> >> > > An almost two years old Intel X25-E : > > # hdparm -t /dev/sda > > /dev/sda: > Timing buffered disk reads: 714 MB in 3.01 seconds = 237.40 MB/sec > > # uname -a > Linux matrix 3.6.2-gentoo #1 SMP PREEMPT Sun Oct 21 22:49:01 IST 2012 x86_64 > AMD Phenom(tm) II X4 955 Processor AuthenticAMD GNU/Linux > > >> >> Does a result of, let's say, 400 MB/sec, which is double speed comparing >> the >> above result, will boost a task of building a linux kernel (on a dual >> core machine) >> in about 1.5 or 2? >> > > I really don't think so. SSDs (IMHO) makes computer much faster due to the > VERY low seek time - the time it takes you to get a block. Compare 10-20ms > with ~0.1ms. A regular hard drive simply wastes a lost of time seeking the > data, instead of... reading it :) When you work with a lot of files, getting > to the file fast makes a tremendous difference. This is similar to the > reason why browsing websites which are close to you network-wise is much > faster - even though the bandwidth you have is the same - the client/server > latency due to the network affects the time it takes you to negotiate > (compare to 'seek') with the server the content you want. The more objects > you want, the higher the latency, the slower the site will load. This is why > using CDNs and reducing the number of HTTP requests (e.g. by using CSS > Sprites) - help a lot in speeding websites. > >> >> Second question: >> I must admit that I am a newbie with SSD, so this question might seem >> obvoious to others: >> I saw that inner SSD disks, which are sold in stores like KSP/Ivory, >> are in laptop form factor (2.5''). >> >> Is there some reason that there are no inner 3.5'' disks for Desktops >> (there >> are extenal SSD which can be , so I believe, used with desktops) ? > > > Hard Drives have a reason to be large - they have a platter that occupies > space. If you reduce the platter size, you need to enlarge the density, or > add more platters - which adds thickness, noise, heat, and lowers your MTBF. > Electronics nowdays are small and doesn't need all that... There's no point > in making a large chassis just for the purpose of a large chassis... > > >> >> Is there something which prevent us from connecting 2.5'' inner SSD to >> a desktop (I mean STAT2- based or SATA3-based) ? >> > > Not really. The SATA is the same. Your only issue is fixating the drive to > your PC chassis. Some computer cases have a special place for 2.5" drives > for SSD (like my Antec 1200). Alternatively there are 3.5"->2.5" adapters. > But learn from someone who made a mistake (me ;)) - check before you buy > that they're compatible with the screws location of the SSD. > > HTH, > > -- Shimi > _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
