SDB:Installing on LARGE disks

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When your disk array is larger than 2TB, you may have problems. If you want to boot from a 2TB array, you WILL have problems. Here's what to do to get this working.


GRUB Problems

Grub won't boot from a large disk array without patches (because you need to use a GPT disk label), so your install will be complicated. First off, get a 32bit machine. You need to make GRUB 32bit, and it's easiest if you've got a 32bit machine. Get the 0.97 source tree and patch it with the two patches mentioned in the above article.

Build grub. I built it to install in /opt/grub. Install it on your build machine and copy that tree (in my case /opt/grub) to a usb stick or CD or something.

YaST Install

By default YaST will partition your disk with an MSDOS disk label. This won't work, because there's a 2TB limit. Just before you get into the partitioner, switch VT's to get a shell. Run gpart and put a GPT disklabel on the disk. You can go ahead and create some partitions too it you'd like.

Back in the YaST-2 installer, finish up your partitioning. YaST will be nice and keep the GPT disk label.

Proceed normally with the install. YaST will yell at you and tell you that grub won't work. Indeed, it won't. Click through it. When the installation 1st phase is complete, the system will reboot, but won't get far.

At this point, boot into a rescue system. Mount your root disk, say, on /mnt. Chroot into /mnt. Manually mknod your /dev files for your disk array and partitions (/dev/sda is b 8 0, /dev/sda1 is b 8 1, etc...). Mount your /boot. Copy your patched grub tree from the media you saved it on to /opt/grub (or whatever you said when running Configure). Then, cd /opt/grub/sbin. ./grub-install /dev/sda.

Now umount your /boot, and remove the /dev/sda* files you made.

Exit from chroot and umount your root.

reboot

Your machine should boot from this big disk array and YaST should continue normally.

The Patches

Initrd Patch for Grub 0.97

    Date: 2005-11-11
    Author: Otavio Salvador
    Comment: Stolen from SuSE grub package.
     It fix the max address of initrd image and include a safe
     default in case of it isn't available

--- grub-0.94/stage2/boot.c.orig        2004-01-11 09:49:05.000000000 +0100
+++ grub-0.94/stage2/boot.c     2004-03-04 16:11:21.857403508 +0100
@@ -810,8 +810,11 @@
     moveto = (mbi.mem_upper + 0x400) << 10;
   
   moveto = (moveto - len) & 0xfffff000;
-  max_addr = (lh->header == LINUX_MAGIC_SIGNATURE && lh->version >= 0x0203
-             ? lh->initrd_addr_max : LINUX_INITRD_MAX_ADDRESS);
+  max_addr = LINUX_INITRD_MAX_ADDRESS;
+  if (lh->header == LINUX_MAGIC_SIGNATURE &&
+      lh->version >= 0x0203 &&
+      lh->initrd_addr_max < max_addr)
+    max_addr = lh->initrd_addr_max;
   if (moveto + len >= max_addr)
     moveto = (max_addr - len) & 0xfffff000;

GPT Patch for Grub 0.96 (works on 0.97)

--- grub-0.96/stage2/builtins.c 2004-06-20 09:33:04.000000000 -0400
+++ grub-0.96-patched/stage2/builtins.c 2007-01-04 13:56:06.000000000 -0500
@@ -1229,14 +1229,15 @@
   for (drive = 0x80; drive < 0x88; drive++)
     {
       unsigned long part = 0xFFFFFF;
-      unsigned long start, len, offset, ext_offset;
-      int type, entry;
+      unsigned long start, len, offset, ext_offset, gpt_offset;
+      int type, entry, gpt_count, gpt_size;
       char buf[SECTOR_SIZE];
 
       current_drive = drive;
       while (next_partition (drive, 0xFFFFFF, &part, &type,
                             &start, &len, &offset, &entry,
-                            &ext_offset, buf))
+                            &ext_offset, &gpt_offset,
+                            &gpt_count, &gpt_size, buf))
        {
          if (type != PC_SLICE_TYPE_NONE
              && ! IS_PC_SLICE_TYPE_BSD (type)
@@ -2806,8 +2807,8 @@
 {
   int new_type;
   unsigned long part = 0xFFFFFF;
-  unsigned long start, len, offset, ext_offset;
-  int entry, type;
+  unsigned long start, len, offset, ext_offset, gpt_offset;
+  int entry, type, gpt_count, gpt_size;
   char mbr[512];
 
   /* Get the drive and the partition.  */
@@ -2844,7 +2845,14 @@
   /* Look for the partition.  */
   while (next_partition (current_drive, 0xFFFFFF, &part, &type,
                         &start, &len, &offset, &entry,
-                        &ext_offset, mbr))
+                        &ext_offset, &gpt_offset, &gpt_count, &gpt_size, mbr))
+         /* The partition may not be a GPT partition.  */
+         if (gpt_offset != 0)
+           {
+               errnum = ERR_BAD_ARGUMENT;
+               return 1;
+           }
+
     {
       if (part == current_partition)
        {
diff -ruBbd --unidirectional-new-file grub-0.96/stage2/disk_io.c grub-0.96-patched/stage2/disk_io.c
--- grub-0.96/stage2/disk_io.c  2004-05-23 12:35:24.000000000 -0400
+++ grub-0.96-patched/stage2/disk_io.c  2007-01-04 14:01:08.000000000 -0500
@@ -21,6 +21,7 @@
 
 #include <shared.h>
 #include <filesys.h>
+#include <gpt.h>
 
 #ifdef SUPPORT_NETBOOT
 # define GRUB  1
@@ -502,8 +503,8 @@
 set_partition_hidden_flag (int hidden)
 {
   unsigned long part = 0xFFFFFF;
-  unsigned long start, len, offset, ext_offset;
-  int entry, type;
+  unsigned long start, len, offset, ext_offset, gpt_offset;
+  int entry, type, gpt_count, gpt_size;
   char mbr[512];
   
   /* The drive must be a hard disk.  */
@@ -524,7 +525,14 @@
   /* Look for the partition.  */
   while (next_partition (current_drive, 0xFFFFFF, &part, &type,           
                         &start, &len, &offset, &entry,
-                        &ext_offset, mbr))
+                        &ext_offset, &gpt_offset, &gpt_count, &gpt_size, mbr))
+         /* The partition may not be a GPT partition.  */
+         if (gpt_offset != 0)
+           {
+               errnum = ERR_BAD_ARGUMENT;
+               return 1;
+           }
+
     {                                                                       
       if (part == current_partition)
        {
@@ -577,11 +585,14 @@
                unsigned long *partition, int *type,
                unsigned long *start, unsigned long *len,
                unsigned long *offset, int *entry,
-               unsigned long *ext_offset, char *buf)
+               unsigned long *ext_offset,
+               unsigned long *gpt_offset, int *gpt_count,
+               int *gpt_size, char *buf)
 {
   /* Forward declarations.  */
   auto int next_bsd_partition (void);
   auto int next_pc_slice (void);
+  auto int next_gpt_slice(void);
 
   /* Get next BSD partition in current PC slice.  */
   int next_bsd_partition (void)
@@ -666,6 +677,40 @@
          return 0;
        }
 
+      /* If this is a GPT partition table, read it as such.  */
+      if (*entry == -1 && *offset == 0 && PC_SLICE_TYPE (buf, 0) == PC_SLICE_TYPE_GPT)
+       {
+         struct grub_gpt_header *hdr = (struct grub_gpt_header *) buf;
+
+         /* Read in the GPT Partition table header.  */
+         if (! rawread (drive, 1, 0, SECTOR_SIZE, buf))
+           return 0;
+
+         if (hdr->magic == GPT_HEADER_MAGIC && hdr->version == 0x10000)
+           {
+             /* Let gpt_offset point to the first entry in the GPT
+                partition table.  This can also be used by callers of
+                next_partition to determine if a entry comes from a
+                GPT partition table or not.  */
+             *gpt_offset = hdr->partitions;
+             *gpt_count = hdr->maxpart;
+             *gpt_size =  hdr->partentry_size;
+             
+             return next_gpt_slice();
+           }
+         else
+           {
+             /* This is not a valid header for a GPT partition table.
+                Re-read the MBR or the boot sector of the extended
+                partition.  */
+             if (! rawread (drive, *offset, 0, SECTOR_SIZE, buf))
+               return 0;
+           }
+       }
+
+      /* Not a GPT partition.  */
+      *gpt_offset = 0;
+
       /* Increase the entry number.  */
       (*entry)++;
 
@@ -710,6 +755,43 @@
       return 1;
     }
 
+  /* Get the next GPT slice.  */
+  int next_gpt_slice (void)
+    {
+      struct grub_gpt_partentry *gptentry = (struct grub_gpt_partentry *) buf;
+      /* Make GPT partitions show up as PC slices.  */
+      int pc_slice_no = (*partition & 0xFF0000) >> 16;
+
+      /* If this is the first time...  */
+      if (pc_slice_no == 0xFF)
+       {
+         pc_slice_no = -1;
+         *entry = -1;
+       }
+
+      do {
+       (*entry)++;
+
+       if (*entry >= *gpt_count)
+         {
+           errnum = ERR_NO_PART;
+           return 0;
+         }
+       /* Read in the GPT Partition table entry.  */
+       if (! rawread (drive, (*gpt_offset) + GPT_ENTRY_SECTOR (*gpt_size, *entry), GPT_ENTRY_INDEX (*gpt_s
ize, *entry), *gpt_size, buf))
+         return 0;
+      } while (! (gptentry->type1 && gptentry->type2));
+
+      pc_slice_no++;
+      *start = gptentry->start;
+      *len = gptentry->end - gptentry->start + 1;
+      *type = PC_SLICE_TYPE_EXT2FS;
+      *entry = pc_slice_no;
+      *partition = (*entry << 16) | 0xFFFF;
+
+      return 1;
+    }
+
   /* Start the body of this function.  */
   
 #ifndef STAGE1_5
@@ -717,6 +799,9 @@
     return 0;
 #endif
 
+  if (*partition != 0xFFFFFF && *gpt_offset != 0)
+    return next_gpt_slice ();
+
   /* If previous partition is a BSD partition or a PC slice which
      contains BSD partitions...  */
   if ((*partition != 0xFFFFFF && IS_PC_SLICE_TYPE_BSD (*type & 0xff))
@@ -755,6 +840,9 @@
   unsigned long dest_partition = current_partition;
   unsigned long part_offset;
   unsigned long ext_offset;
+  unsigned long gpt_offset;
+  int gpt_count;
+  int gpt_size;
   int entry;
   char buf[SECTOR_SIZE];
   int bsd_part, pc_slice;
@@ -766,7 +854,8 @@
       int ret = next_partition (current_drive, dest_partition,
                                &current_partition, &current_slice,
                                &part_start, &part_length,
-                               &part_offset, &entry, &ext_offset, buf);
+                               &part_offset, &entry, &ext_offset,
+                               &gpt_offset, &gpt_count, &gpt_size, buf);
       bsd_part = (current_partition >> 8) & 0xFF;
       pc_slice = current_partition >> 16;
       return ret;
diff -ruBbd --unidirectional-new-file grub-0.96/stage2/gpt.h grub-0.96-patched/stage2/gpt.h
--- grub-0.96/stage2/gpt.h      1969-12-31 19:00:00.000000000 -0500
+++ grub-0.96-patched/stage2/gpt.h      2007-01-04 13:52:14.000000000 -0500
@@ -0,0 +1,68 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2005,2006   Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _GPT_H
+#define _GPT_H
+
+typedef signed char grub_int8_t;
+typedef signed short grub_int16_t;
+typedef signed int grub_int32_t;
+typedef signed long long int grub_int64_t;
+typedef unsigned char grub_uint8_t;
+typedef unsigned short grub_uint16_t;
+typedef unsigned int grub_uint32_t;
+typedef unsigned long long int grub_uint64_t;
+
+struct grub_gpt_header
+{
+  grub_uint64_t magic;
+  grub_uint32_t version;
+  grub_uint32_t headersize;
+  grub_uint32_t crc32;
+  grub_uint32_t unused1;
+  grub_uint64_t primary;
+  grub_uint64_t backup;
+  grub_uint64_t start;
+  grub_uint64_t end;
+  grub_uint8_t guid[16];
+  grub_uint64_t partitions;
+  grub_uint32_t maxpart;
+  grub_uint32_t partentry_size;
+  grub_uint32_t partentry_crc32;
+} __attribute__ ((packed));
+
+struct grub_gpt_partentry
+{
+  grub_uint64_t type1;
+  grub_uint64_t type2;
+  grub_uint8_t guid[16];
+  grub_uint64_t start;
+  grub_uint64_t end;
+  grub_uint8_t attrib;
+  char name[72];
+} __attribute__ ((packed));
+
+#define GPT_HEADER_MAGIC       0x5452415020494645UL
+
+#define        GPT_ENTRY_SECTOR(size,entry)                                    \
+       ((((entry) * (size) + 1) & ~(SECTOR_SIZE - 1)) >> SECTOR_BITS)
+#define        GPT_ENTRY_INDEX(size,entry)                                     \
+       ((((entry) * (size) + 1) & (SECTOR_SIZE - 1)) - 1)
+
+#endif /* _GPT_H */
diff -ruBbd --unidirectional-new-file grub-0.96/stage2/pc_slice.h grub-0.96-patched/stage2/pc_slice.h
--- grub-0.96/stage2/pc_slice.h 2003-07-09 07:45:53.000000000 -0400
+++ grub-0.96-patched/stage2/pc_slice.h 2007-01-04 13:52:14.000000000 -0500
@@ -115,6 +115,7 @@
 #define PC_SLICE_TYPE_LINUX_EXTENDED   0x85
 #define PC_SLICE_TYPE_VSTAFS           0x9e
 #define PC_SLICE_TYPE_DELL_UTIL                0xde
+#define PC_SLICE_TYPE_GPT              0xee
 #define PC_SLICE_TYPE_LINUX_RAID       0xfd
 
 
diff -ruBbd --unidirectional-new-file grub-0.96/stage2/shared.h grub-0.96-patched/stage2/shared.h
--- grub-0.96/stage2/shared.h   2004-06-19 12:40:09.000000000 -0400
+++ grub-0.96-patched/stage2/shared.h   2007-01-04 13:52:15.000000000 -0500
@@ -934,7 +934,9 @@
                    unsigned long *partition, int *type,
                    unsigned long *start, unsigned long *len,
                    unsigned long *offset, int *entry,
-                   unsigned long *ext_offset, char *buf);
+                   unsigned long *ext_offset,
+                   unsigned long *gpt_offset, int *gpt_count,
+                   int *gpt_size, char *buf);
 
 /* Sets device to the one represented by the SAVED_* parameters. */
 int make_saved_active (void);