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...r local SYSLINUX source code installation to me. Just to be sure that the modified copy fits into that installation. ---------------------------------------------------------- Reasoning for my proposal (math, not computer science): > > You want to align the > > resulting ISO to 4 full cylinders in order to avoid > > the need for a cylinder size divisible by 4. > No :). I want to align to resulting isohybrid image size to 4 full > cylinders *only when necessary*. That's what my proposed computation does. It predicts the minimum number of cylinders which you need as p...

...; Ady wrote: > > I am not so sure that using a different pair of '-h' and '-s' values > > would be better than using 255/63. > > But 255 * 63 is not divisible by 4 and thus can cause > trouble with virtual DVD-ROM. And my suggestion to modify the _amount_ of Cylinders was intended to overcome the "by 4" (or rather, "by 2048") issue. > > > Most BIOS and most partition editors would assume this geometry. > > I cannot tell for BIOSes, but partition editors have options > to set heads-per-cyl and sectors-per-head. At lea...

Hi, Ady wrote: > my suggestion to modify the _amount_ of Cylinders was intended to > overcome the "by 4" (or rather, "by 2048") issue. Now i get your intention. You want to align the resulting ISO to 4 full cylinders in order to avoid the need for a cylinder size divisible by 4. This would work. But with -h 255 -s 63 it could waste up...

...sunderstanding your code. Let me try with an example (or two). For this example, let's assume: -h 255 -s 63 ISO size: 1'085'736'960 bytes ( > 1GiB) This size happens to be a multiple of: 63, 255 and 2048 So, using these values in my suggested loop. 1_ Calculate a potential Cylinders (amount) value; Cylinders= trunc(roundup( ISO_size / (Heads * Sectors_per_track * 512)) Cylinders (1st attempt)= trunc(roundup(1085736960/(255*63*512)) Cylinders (1st attempt)= trunc(roundup(132)) Cylinders (1st attempt)=132 2_ Calculate 'Cylinders * Heads * Sectors_per_track'...

...Most BIOS and most partition editors would assume this geometry. I cannot tell for BIOSes, but partition editors have options to set heads-per-cyl and sectors-per-head. At least fdisk makes guesses from comparing LBA and CHS of the partition ends under the assumption that each partition ends at a cylinder end. > Additionally, what do you mean with "non-traditional sizes"? Or, in > other words, what would constitute a traditional size for the resulting > isohybrid image? I mean non-traditional cylinder sizes. Advised by hpa are 64x32 and 255x63, but i assume that he was not...

Hi, I modified my kickstart to do some custom partioning and formating in a pre-install script. I am trying to align the partitions on the RAID stripe (and format with a correct stride). But, sfdisk complains that it does not start/end on a cylinder boundary (used -L option to limit complaining). Since the cylinder size is not a multiple of the stripe size, I cannot align on both. I tried to align the begining on the stripe and the end on the end of a cylinder, but sfdisk still compains... Basicaly, I have a 128KB (256 sectors) stripe, and 2...

> Hi, > > Ady wrote: > > my suggestion to modify the _amount_ of Cylinders was intended to > > overcome the "by 4" (or rather, "by 2048") issue. > > Now i get your intention. You want to align the > resulting ISO to 4 full cylinders in order to avoid > the need for a cylinder size divisible by 4. > No :). I want to align to...

...>root (hd1,0 grub>setup (hd1) grub>quit then reboot, but is still get the error : disk boot faillure, insert linux install disk. does anyone now what i'm doing wrong? here is a copy of my partition scheme. Disk /dev/sda: 251.0 GB, 251000193024 bytes 255 heads, 63 sectors/track, 30515 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 38 305203+ fd Linux raid autodetect /dev/sda2 39 675 5116702+ fd Linux raid autodetect /dev/sda3 676...

Hello, I want to draw 3D cylinder objects in R. Given is the length and the diameter of the cylinder. Has anybody an example? Thank you very much! Best regards -- ---------------------- Dr. Hans-Joachim Klemmt Forstoberrat Organisationsprogrammierer IHK Bayerische Landesanstalt f?r Wald und Forstwirtschaft zugewiesen a...

Hi, it would be interesting to know for what solution TAILS decides and whether any problems arise with it. ------------------------------------------------------- On with the fundamental discussion of MBR cylinders: Ady wrote: > 1_ The resulting ISO9660 file system size shall be a multiple of 2048 > (bytes_per_sector). The known ISO production programs comply to this condition. (Theoretically there could be other block sizes between 512 byte and 64 KiB. But 2048 is the address granularity of opt...

...nd I want to correlate that to the output of fdisk -l, so that I can feed the disk partition I want to iostat, how would I go about that? Here is my output from fdisk -l [root at uszmpdblp010la mysql]# fdisk -l Disk /dev/cciss/c0d0: 146.7 GB, 146778685440 bytes 255 heads, 32 sectors/track, 35132 cylinders Units = cylinders of 8160 * 512 = 4177920 bytes Device Boot Start End Blocks Id System /dev/cciss/c0d0p1 * 1 120 488281 83 Linux Partition 1 does not end on cylinder boundary. /dev/cciss/c0d0p2 121 35131 142841947+...

> Hi, > > it would be interesting to know for what solution > TAILS decides and whether any problems arise with it. > > ------------------------------------------------------- > On with the fundamental discussion of MBR cylinders: > > Ady wrote: > > 1_ The resulting ISO9660 file system size shall be a multiple of 2048 > > (bytes_per_sector). > > The known ISO production programs comply to this condition. > (Theoretically there could be other block sizes between > 512 byte and 64 KiB. But...

Hi, my proposal is based on a mathematical proof (see mail before) and yours is correct too. They cannot but match. Let's inspect your examples: Ady wrote: > ISO size: 1'085'736'960 bytes ( > 1GiB) This are exactly 132 cylinders of 255x63. 132 is divisible by 4. So there is no padding needed. > Cylinders (1st attempt)=132 > [...] > 2120580 / 4 = 530145, so the answer is "yes". My calculation gets align_factor = 4. So isohybrid would pad up to quadruple cylinders. Well, 132 is already such a quadru...

My CentOS 5.4 box has a single HBA card with 2 ports connected to my Storage. 2 Luns are assigned to my HBA card. Under /dev instead of seeing 4 devices I can see 12 devices from sdb to sdm. I am using qlogic driver that is bulitin to the OS. Has any one seen this kind of situation? Paras -------------- next part -------------- An HTML attachment was scrubbed... URL:

...age size: round up to a multiple of $h*$s*512 http://git.kernel.org/cgit/boot/syslinux/syslinux.git/tree/utils/isohybrid.c cylsize = head * sector * 512; frac = isostat.st_size % cylsize; padding = (frac > 0) ? cylsize - frac : 0; With -h 255 -s 63, both pad to an integer number of cylinders with an impair multiple of 512 bytes. So if the number of cylinders is not divisible by 4, then the number of bytes is not divisible by 2048. An ISO image may have a fuzzy end, but a virtual CD-ROM should indeed provide an integer number of 2048-byte blocks. > truncate -s %2048 $ISO This...

...er) media would boot correctly in as > many systems as possible Agreed. But we now have a report about failure of 255x63 on a popular pseudo-hardware, when the ISO is presented as DVD-ROM. (Probably there is no complaint when it gets presented as hard disk.) We do have statements by hpa that cylinder geometry can matter. But actually i am not aware of a particular example, from which we could judge whether 255x63 is essential for any popular hardware/firmware. > Now, if the proposed (temporal?) workaround is to use a different pair > of '-h' and '-s' values, I would s...

Dear all, I would like to draw a 3-D horizontal cylinder preferably in RGL device (because this gives the look from different angles). Basic idea is from http://www.tau.ac.il/cc/pages/docs/sas8/insight/chap18/sect3.htm. Below is the description exactly what I want to do. Please see at figure 18.6, 1st plot. Here it is an confidence ellipsoid. Suppose...

...Version is: 8 ATA Standard is: ATA-8-ACS revision 4 Local Time is: Mon May 28 13:12:35 2012 CEST SMART support is: Available - device has SMART capability. SMART support is: Enabled fdisk shows: fdisk -l /dev/sdc Disk /dev/sdc: 120.0 GB, 120034123776 bytes 32 heads, 32 sectors/track, 228946 cylinders Units = cylinders of 1024 * 512 = 524288 bytes Device Boot Start End Blocks Id System /dev/sdc1 3 491 250368 83 Linux /dev/sdc2 492 228946 116968960 fd Linux raid autodetect fdisk -l /dev/sdd Disk /dev/sdd: 120.0 GB,...

> I proposed -h 252 -s 63 because it yields the largest > possible cylinder size which is divisible by 4 (i.e. > the byte count is divisible by 512*4 = 2048). > -h 240 -s 63 would fulfill this constraint, too. > Size limits are 252*63*1024*512 = 8,323,596,288 > resp. 240*63*1024*512 = 7,927,234,560 bytes. > > > The workaround cannot be te...

...ylab="Miles per Gallon") mtcars$wt.cyl<-mtcars$wt[mtcars$cyl] mtcars$mpg.cyl<-mtcars$mpg[mtcars$cyl] points(mtcars$wt.cyl, mtcars$mpg.cyl, pch = 17, col = "red") title("Motor Trend Data") text(2,10,"LTR",cex=1.2,adj=0,col=3) legend(4,30,c("4 cylinder","6 cylinder","8 cylinder"),pch=c(3,17,19), cex=1.2, col=c("blue", "red", "purple4")) LTR [[alternative HTML version deleted]]