Re: [gentoo-user] Partition of 3TB USB drive not detected
On 08/06/2016 02:21 AM, Andrea Conti wrote: Hi, ~ # parted /dev/sde print Model: WD My Book 1230 (scsi) Disk /dev/sde: 6001GB Sector size (logical/physical): 4096B/4096B [...] AFAICS this partition works fine, fsck does not report any problem. The funny thing is, it should not have been possible, because of the 2GB limit of MBR. The real limit of MBR is 2^32 sectors, which amounts to 2TB when using 512B sectors. Both your disks are using native 4kB sectors (look at the logical sector size in the parted output), which effectively raises the MBR limit to 16TB. Not that this answers your question, as the Linux kernel has supported 4kB sectors for years and AFAIK it does not need any special configuration options to do so... andrea It's always a good idea to check alignment on the newer disks. Here's a doc [1]; but it's not always clear how to ensure proper alignment. Supposidly the newer tools do this automation, but it's not 100%; ymmv. [1] https://www.ibm.com/developerworks/linux/library/l-linux-on-4kb-sector-disks/ Many disk are hybrids of the 512/4906 sector size. hth, James
Re: [gentoo-user] Partition of 3TB USB drive not detected
Hi, > ~ # parted /dev/sde print > Model: WD My Book 1230 (scsi) > Disk /dev/sde: 6001GB > Sector size (logical/physical): 4096B/4096B [...] > AFAICS this partition works fine, fsck does not report any problem. The > funny thing is, it should not have been possible, because of the 2GB limit > of MBR. The real limit of MBR is 2^32 sectors, which amounts to 2TB when using 512B sectors. Both your disks are using native 4kB sectors (look at the logical sector size in the parted output), which effectively raises the MBR limit to 16TB. Not that this answers your question, as the Linux kernel has supported 4kB sectors for years and AFAIK it does not need any special configuration options to do so... andrea
Re: [gentoo-user] Partition of 3TB USB drive not detected
On 08/01/2016 01:45 AM, J. Roeleveld wrote: On Sunday, July 31, 2016 03:37:55 PM Jörg Schaible wrote: Hi, for my backups I use a 3TB USB drive (one big ext4 partition) without any problems. Just plug in the cable, mount it and perform the backup. The partition (sdi1) is detected an mountable without any problems: === %< == $ ls -l /dev/disk/by-id total 0 === %< == However, when I boot a rescue system from a USB stick, the partition on the USB is not detected. I already tried latest SystemRescueCD (default and alternate kernel), Knoppix and the Gentoo Admin CD. Nothing, the partition is not available. What's the difference? Why does my kernel find this partition and the other one's do not? It's pretty silly to have a backup drive and cannot access it in question ;-) Which kernel do you boot? The systerescue-cd has 4 kernels: 2 * 64bit and 2 * 32bit. By default, it boots the "default" one for the architecture you are booting. Have you tried booting the "alternate" kernel? I have 1 system that I need to boot using the "alternate" kernel as the "default" one is too old. (Yes, by default it boots an old kernel) It could easily be that the kernel you are using does not support your USB3 adapter or something else you used. Eg. apart from all the 'ls' statements, also check "uname" and "/proc/config.gz" for differences. I was just reading about "IOMMU" and how often, if it is not "correctly configured" in the kernel and other places, your memory map to other hardwawre, like USB, can be flaky or not work at all. Fixes often require loading the latest bios for your motherboard. It also matters the 'rev' of your motherboard and other details. I have a Gigabyte GA-990FXA-ud3 that seems to be a victim of this bug. No, I have not had time to ferret out this issue, so here are a few raw links where it is talked about:: https://www.reddit.com/r/linux/comments/4ixnyg/question_about_iommu/ https://en.wikipedia.org/wiki/Input–output_memory_management_unit http://developer.amd.com/community/blog/2008/09/01/iommu/ http://pages.cs.wisc.edu/~basu/isca_iommu_tutorial/ https://en.wikipedia.org/wiki/List_of_IOMMU-supporting_hardware (more posted if you ask)... hth, James
Re: [gentoo-user] Partition of 3TB USB drive not detected
On Sunday, July 31, 2016 03:37:55 PM Jörg Schaible wrote: > Hi, > > for my backups I use a 3TB USB drive (one big ext4 partition) without any > problems. Just plug in the cable, mount it and perform the backup. The > partition (sdi1) is detected an mountable without any problems: > > === %< == > $ ls -l /dev/disk/by-id > total 0 === %< == > > However, when I boot a rescue system from a USB stick, the partition on the > USB is not detected. I already tried latest SystemRescueCD (default and > alternate kernel), Knoppix and the Gentoo Admin CD. Nothing, the partition > is not available. > > What's the difference? Why does my kernel find this partition and the other > one's do not? It's pretty silly to have a backup drive and cannot access it > in question ;-) Which kernel do you boot? The systerescue-cd has 4 kernels: 2 * 64bit and 2 * 32bit. By default, it boots the "default" one for the architecture you are booting. Have you tried booting the "alternate" kernel? I have 1 system that I need to boot using the "alternate" kernel as the "default" one is too old. (Yes, by default it boots an old kernel) It could easily be that the kernel you are using does not support your USB3 adapter or something else you used. Eg. apart from all the 'ls' statements, also check "uname" and "/proc/config.gz" for differences. -- Joost
Re: [gentoo-user] Partition of 3TB USB drive not detected
On 07/31/2016 08:37 AM, Jörg Schaible wrote: Hi, for my backups I use a 3TB USB drive (one big ext4 partition) without any problems. Just plug in the cable, mount it and perform the backup. The partition (sdi1) is detected an mountable without any problems: this tells you the device is valid and working. good. However, when I boot a rescue system from a USB stick, the partition on the USB is not detected. I already tried latest SystemRescueCD (default and alternate kernel), Knoppix and the Gentoo Admin CD. Nothing, the partition is not available. So there could be a multitude of reasons. Did thos systems have a bios that support booting from a usb device? Are the bios setting set to select the bios device correct? I recently read somewhere the usb devices only support (2) types of image booting, but I cannot find that doc right now. rodsbooks is an excellent resource for all the issues around booting and device and various hardware/firmware issues. LikeWhoa has made booting the usb for gentoo, commonplace so search out those postings on the gentoo forums and in the wiki. What's the difference? Why does my kernel find this partition and the other one's do not? It's pretty silly to have a backup drive and cannot access it in question ;-) It could be many things. You just have to ferret thru ideas until something works for your hardware, and it is a frustrating process. make sure the image you are trying to boot is on a compatible partition and file system that is supported by the boot image. hth, James
Re: [gentoo-user] Partition of 3TB USB drive not detected
On 07/31/2016 06:37 AM, Jörg Schaible wrote: > Hi, > > for my backups I use a 3TB USB drive (one big ext4 partition) without any > problems. Just plug in the cable, mount it and perform the backup. The > partition (sdi1) is detected an mountable without any problems: > > === %< == > $ ls -l /dev/disk/by-id > total 0 > lrwxrwxrwx 1 root root 9 Jul 31 13:17 ata- > Crucial_CT500MX200SSD1_161512468483 -> ../../sda > lrwxrwxrwx 1 root root 10 Jul 31 13:17 ata- > Crucial_CT500MX200SSD1_161512468483-part1 -> ../../sda1 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 ata- > Crucial_CT500MX200SSD1_161512468483-part2 -> ../../sda2 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 ata- > Crucial_CT500MX200SSD1_161512468483-part3 -> ../../sda3 > lrwxrwxrwx 1 root root 9 Jul 31 13:17 ata-HL-DT-ST_DVDRAM_GH41N_K5Q9AN32423 > -> ../../sr0 > lrwxrwxrwx 1 root root 9 Jul 31 15:20 ata-ST3000DM001-1CH166_Z1F45VR9 -> > ../../sdi > lrwxrwxrwx 1 root root 10 Jul 31 15:20 ata-ST3000DM001-1CH166_Z1F45VR9-part1 > -> ../../sdi1 > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic- > _Compact_Flash_2006041309210-0:0 -> ../../sdc > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic-_MS_MS- > Pro_2006041309210-0:3 -> ../../sdf > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic- > _SD_MMC_2006041309210-0:2 -> ../../sde > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic-_SM_xD- > Picture_2006041309210-0:1 -> ../../sdd > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic_Flash_HS- > CF_26020128B005-0:0 -> ../../sdg > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-Generic_Flash_HS- > COMBO_26020128B005-0:1 -> ../../sdh > lrwxrwxrwx 1 root root 9 Jul 31 13:17 usb-INTENSO_USB_AA0401297518-0:0 > -> ../../sdb > lrwxrwxrwx 1 root root 10 Jul 31 13:17 usb-INTENSO_USB_AA0401297518-0:0- > part1 -> ../../sdb1 > lrwxrwxrwx 1 root root 9 Jul 31 15:20 wwn-0x5000c50065531ec5 -> ../../sdi > lrwxrwxrwx 1 root root 10 Jul 31 15:20 wwn-0x5000c50065531ec5-part1 -> > ../../sdi1 > lrwxrwxrwx 1 root root 9 Jul 31 13:17 wwn-0x50014800 -> ../../sr0 > lrwxrwxrwx 1 root root 9 Jul 31 13:17 wwn-0x500a075112468483 -> ../../sda > lrwxrwxrwx 1 root root 10 Jul 31 13:17 wwn-0x500a075112468483-part1 -> > ../../sda1 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 wwn-0x500a075112468483-part2 -> > ../../sda2 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 wwn-0x500a075112468483-part3 -> > ../../sda3 > === %< == > $ ls -l /dev/disk/by-label > total 0 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 boot -> ../../sda1 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 gentoo -> ../../sda3 > lrwxrwxrwx 1 root root 10 Jul 31 15:20 intenso -> ../../sdi1 > lrwxrwxrwx 1 root root 10 Jul 31 13:17 swap -> ../../sda2 > === %< == > > However, when I boot a rescue system from a USB stick, the partition on the > USB is not detected. I already tried latest SystemRescueCD (default and > alternate kernel), Knoppix and the Gentoo Admin CD. Nothing, the partition > is not available. > > What's the difference? Why does my kernel find this partition and the other > one's do not? It's pretty silly to have a backup drive and cannot access it > in question ;-) > > - Jörg > > I can only think of two reasons, the kernel on the livecd doesn't support GPT (which is unlikely) or you're booting a 32-bit kernel live USB. I am reasonably certain for drives > 2TB a 64-bit kernel and GPT are required. Dan
