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Diffstat (limited to 'path_priority/pp_hds_modular/pp_hds_modular.c')
| -rw-r--r-- | path_priority/pp_hds_modular/pp_hds_modular.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/path_priority/pp_hds_modular/pp_hds_modular.c b/path_priority/pp_hds_modular/pp_hds_modular.c deleted file mode 100644 index 7411508..0000000 --- a/path_priority/pp_hds_modular/pp_hds_modular.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * (C) Copyright HDS GmbH 2006. All Rights Reserved. - * - * pp_hds_modular.c - * Version 2.00 - * - * Prioritizer for Device Mapper Multipath and HDS Storage - * - * Hitachis Modular Storage contains two controllers for redundancy. The - * Storage internal LUN (LDEV) will normally allocated via two pathes to the - * server (one path per controller). For performance reasons should the server - * access to a LDEV only via one controller. The other path to the other - * controller is stand-by. It is also possible to allocate more as one path - * for a LDEV per controller. Here is active/active access allowed. The other - * pathes via the other controller are stand-by. - * - * This prioritizer checks with inquiry command the represented LDEV and - * Controller number and gives back a priority followed by this scheme: - * - * CONTROLLER ODD and LDEV ODD: PRIORITY 1 - * CONTROLLER ODD and LDEV EVEN: PRIORITY 0 - * CONTROLLER EVEN and LDEV ODD: PRIORITY 0 - * CONTROLLER EVEN and LDEV EVEN: PRIORITY 1 - * - * In the storage you can define for each LDEV a owner controller. If the - * server makes IOs via the other controller the storage will switch the - * ownership automatically. In this case you can see in the storage that the - * current controller is different from the default controller, but this is - * absolutely no problem. - * - * With this prioritizer it is possible to establish a static load balancing. - * Half of the LUNs are accessed via one HBA/storage controller and the other - * half via the other HBA/storage controller. - * - * In cluster environmemnts (RAC) it also guarantees that all cluster nodes have - * access to the LDEVs via the same controller. - * - * You can run the prioritizer manually in verbose mode: - * # pp_hds_modular -v 8:224 - * VENDOR: HITACHI - * PRODUCT: DF600F-CM - * SERIAL: 0x0105 - * LDEV: 0x00C6 - * CTRL: 1 - * PORT: B - * CTRL ODD, LDEV EVEN, PRIO 0 - * - * To compile this source please execute # cc pp_hds_modular.c -o /sbin/mpath_prio_hds_modular - * - * Changes 2006-07-16: - * - Changed to forward declaration of functions - * - The switch-statement was changed to a logical expression - * - unlinking of the devpath now also occurs at the end of - * hds_modular_prio to avoid old /tmp/.pp_balance.%u.%u.devnode - * entries in /tmp-Directory - * - The for-statements for passing variables where changed to - * snprintf-commands in verbose mode - * Changes 2006-08-10: - * - Back to the old switch statements because the regular expression does - * not work under RHEL4 U3 i386 - * Changes 2007-06-27: - * - switched from major:minor argument to device node argument - * - * This file is released under the GPL. - * - */ - -#include <unistd.h> -#include <fcntl.h> -#include <stdio.h> -#include <string.h> -#include <errno.h> -#include <sys/ioctl.h> -#include <stdlib.h> -#include <libdevmapper.h> -#include <memory.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <scsi/sg.h> - -#define INQ_REPLY_LEN 255 -#define INQ_CMD_CODE 0x12 -#define INQ_CMD_LEN 6 -#define FILE_NAME_SIZE 255 - -int verbose=0; - -void print_help (void); -int hds_modular_prio (const char *); - -int main (int argc, char **argv) -{ - int prio; - if (argc == 2) - { - if (strcmp (argv[1], "-h") == 0) - { - print_help (); - exit (0); - } - else - { - verbose = 0; - prio = hds_modular_prio (argv[1]); - printf ("%d\n", prio); - exit (0); - } - } - if ((argc == 3) && (strcmp (argv[1], "-v")) == 0) - { - verbose = 1; - prio = hds_modular_prio (argv[2]); - printf ("%d\n", prio); - exit (0); - } - print_help (); - exit (1); -} - -int hds_modular_prio (const char *dev) -{ - int sg_fd, k; - char vendor[8]; - char product[32]; - char serial[32]; - char ldev[32]; - char ctrl[32]; - char port[32]; - unsigned char inqCmdBlk[INQ_CMD_LEN] = { INQ_CMD_CODE, 0, 0, 0, INQ_REPLY_LEN, 0 }; - unsigned char inqBuff[INQ_REPLY_LEN]; - unsigned char *inqBuffp = inqBuff; - unsigned char sense_buffer[32]; - sg_io_hdr_t io_hdr; - - if ((sg_fd = open (dev, O_RDONLY)) < 0) exit (1); - if ((ioctl (sg_fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) exit (1); - - memset (&io_hdr, 0, sizeof (sg_io_hdr_t)); - io_hdr.interface_id = 'S'; - io_hdr.cmd_len = sizeof (inqCmdBlk); - io_hdr.mx_sb_len = sizeof (sense_buffer); - io_hdr.dxfer_direction = SG_DXFER_FROM_DEV; - io_hdr.dxfer_len = INQ_REPLY_LEN; - io_hdr.dxferp = inqBuff; - io_hdr.cmdp = inqCmdBlk; - io_hdr.sbp = sense_buffer; - io_hdr.timeout = 2000; /* TimeOut = 2 seconds */ - - if (ioctl (sg_fd, SG_IO, &io_hdr) < 0) exit (1); - if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) exit (1); - - snprintf (vendor, 9, "%.8s\n", inqBuffp + 8); - snprintf (product, 17, "%.16s", inqBuffp + 16); - snprintf (serial, 5, "%.4s", inqBuffp + 40); - snprintf (ldev, 5, "%.4s", inqBuffp + 44); - snprintf (ctrl, 2, "%.1s", inqBuffp + 49); - snprintf (port, 2, "%.1s", inqBuffp + 50); - - close (sg_fd); - - if (verbose) - { - printf ("VENDOR: %s\n", vendor); - printf ("PRODUCT: %s\n", product); - printf ("SERIAL: 0x%s\n", serial); - printf ("LDEV: 0x%s\n", ldev); - printf ("CTRL: %s\n", ctrl); - printf ("PORT: %s\n", port); - } - - switch (ctrl[0]) { - case '0': case '2': case '4': case '6': case '8': - switch (ldev[3]) { - case '0': case '2': case '4': case '6': case '8': case 'A': case 'C': case 'E': - if (1 == verbose) printf("CTRL EVEN, LDEV EVEN, PRIO 1\n"); - return 1; - break; - case '1': case '3': case '5': case '7': case '9': case 'B': case 'D': case 'F': - if (1 == verbose) printf("CTRL EVEN, LDEV ODD, PRIO 0\n"); - return 0; - break; - } - case '1': case '3': case '5': case '7': case '9': - switch (ldev[3]) { - case '0': case '2': case '4': case '6': case '8': case 'A': case 'C': case 'E': - if (1 == verbose) printf("CTRL ODD, LDEV EVEN, PRIO 0\n"); - return 0; - break; - case '1': case '3': case '5': case '7': case '9': case 'B': case 'D': case 'F': - if (1 == verbose) printf("CTRL ODD, LDEV ODD, PRIO 1\n"); - return 1; - break; - } - } - return 0; -} - -void print_help (void) -{ - printf ("\n"); - printf ("Usage: pp_hds_modular [-v] <device>\n"); - printf ("Option: -v verbose mode\n"); - printf ("Description: Prioritizer for Device Mapper Multipath and HDS Storage\n"); - printf ("Version: 2.00\n"); - printf ("Author: Matthias Rudolph <matthias.rudolph@hds.com>\n"); - printf ("Remarks: Prioritizer CTRL#1 corresponds to hardware CTRL#0\n"); - printf (" Prioritizer CTRL#2 corresponds to hardware CTRL#1\n"); - printf ("\n"); - return; -} - |