linux下获取scsi上的磁盘设备的序列号

2024-07-06 03:47| 来源: 网络整理| 查看: 265

最简单的方法是直接到/dev/disk/by-id目录下查看，如下是一台机器上的结果 linux-b572:/dev/disk/by-id # ls ata-ST31000525SV_6VP17SN7 scsi-SATA_ST31000525SV_6VP17SN7 wwn-0x5000c5001863e582 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49474761 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49474761 wwn-0x50014ee202b7c499 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49481174 wwn-0x50014ee202b7c499-part1 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part1 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49481174-part1 wwn-0x50014ee202b7c499-part2 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part2 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49481174-part2 wwn-0x50014ee202b7c499-part3 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part3 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49481174-part3 wwn-0x50014ee203752eff ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300086 scsi-SATA_WDC_WD15EVDS-63_WD-WCAVU0300086 wwn-0x50014ee203752eff-part1 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095 scsi-SATA_WDC_WD15EVDS-63_WD-WCAVU0300095 wwn-0x50014ee203752eff-part2 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095-part1 scsi-SATA_WDC_WD15EVDS-63_WD-WCAVU0300095-part1 wwn-0x50014ee20375d94c ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095-part2 scsi-SATA_WDC_WD15EVDS-63_WD-WCAVU0300095-part2 wwn-0x50014ee203766323 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0881976 scsi-SATA_WDC_WD2002FYPS-_WD-WCAVY0881976 wwn-0x50014ee258cbe480 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0951385 scsi-SATA_WDC_WD2002FYPS-_WD-WCAVY0951385 wwn-0x50014ee2ad62dc61 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0965407 scsi-SATA_WDC_WD2002FYPS-_WD-WCAVY0965407 wwn-0x50014ee2ae201ed4 ata-WDC_WD20EVDS-63T3B0_WD-WCAVY0946590 scsi-SATA_WDC_WD20EVDS-63_WD-WCAVY0946590 wwn-0x50014ee2ae21da40

下划线后就是磁盘的序列号了。他们实际都是一个连接符号而已，如下:

linux-b460:/dev/disk/by-id # ll total 0 lrwxrwxrwx 1 root root 9 2012-07-09 18:28 ata-ST31000525SV_6VP17SN7 -> ../../sdl lrwxrwxrwx 1 root root 9 2012-07-11 18:57 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49474761 -> ../../sde lrwxrwxrwx 1 root root 9 2012-06-19 18:58 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174 -> ../../sda lrwxrwxrwx 1 root root 10 2012-06-19 18:58 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part1 -> ../../sda1 lrwxrwxrwx 1 root root 10 2012-06-19 18:58 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part2 -> ../../sda2 lrwxrwxrwx 1 root root 10 2012-06-19 18:59 ata-WDC_WD10EVDS-63N5B1_WD-WCAU49481174-part3 -> ../../sda3 lrwxrwxrwx 1 root root 9 2012-07-11 18:46 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300086 -> ../../sdf lrwxrwxrwx 1 root root 9 2012-07-11 18:46 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095 -> ../../sdj lrwxrwxrwx 1 root root 10 2012-07-06 14:13 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095-part1 -> ../../sdj1 lrwxrwxrwx 1 root root 10 2012-07-06 14:13 ata-WDC_WD15EVDS-63V9B0_WD-WCAVU0300095-part2 -> ../../sdj2 lrwxrwxrwx 1 root root 9 2012-07-11 18:46 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0881976 -> ../../sdg lrwxrwxrwx 1 root root 9 2012-07-11 18:46 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0951385 -> ../../sdh lrwxrwxrwx 1 root root 9 2012-06-27 12:53 ata-WDC_WD2002FYPS-01U1B0_WD-WCAVY0965407 -> ../../sdb lrwxrwxrwx 1 root root 9 2012-07-11 18:46 ata-WDC_WD20EVDS-63T3B0_WD-WCAVY0946590 -> ../../sdi lrwxrwxrwx 1 root root 9 2012-07-09 18:28 scsi-SATA_ST31000525SV_6VP17SN7 -> ../../sdl lrwxrwxrwx 1 root root 9 2012-07-11 18:57 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49474761 -> ../../sde lrwxrwxrwx 1 root root 9 2012-06-19 18:58 scsi-SATA_WDC_WD10EVDS-63_WD-WCAU49481174 -> ../../sda ...

这样，和磁盘的对应关系也得到了。

我们也可以通过ioctl函数来获取磁盘的序列号，代码如下：

int get_serial(int fd, void *buf, size_t buf_len) { unsigned char inq_cmd[] = {INQUIRY, 1, 0x80, 0, buf_len, 0}; unsigned char sense[32]; struct sg_io_hdr io_hdr; memset(&io_hdr, 0, sizeof(io_hdr)); io_hdr.interface_id = 'S'; io_hdr.cmdp = inq_cmd; io_hdr.cmd_len = sizeof(inq_cmd); io_hdr.dxferp = buf; io_hdr.dxfer_len = buf_len; io_hdr.dxfer_direction = SG_DXFER_FROM_DEV; io_hdr.sbp = sense; io_hdr.mx_sb_len = sizeof(sense); io_hdr.timeout = 5000; return ioctl(fd, SG_IO, &io_hdr); } int read_serial(int fd, char *devname, __u8 serial[MAX_RAID_SERIAL_LEN]) { unsigned char scsi_serial[255]; int rv; int rsp_len; int len; char *dest; char *src; char *rsp_buf; int i; memset(scsi_serial, 0, sizeof(scsi_serial)); rv = get_serial(fd, scsi_serial, sizeof(scsi_serial)); if (rv != 0) { if (devname) fprintf(stderr, ": Failed to retrieve serial for %s\n", devname); return rv; } rsp_len = scsi_serial[3]; if (!rsp_len) { if (devname) fprintf(stderr, ": Failed to retrieve serial for %s\n", devname); return 2; } rsp_buf = (char *) &scsi_serial[4]; /* trim all whitespace and non-printable characters and convert * ':' to ';' */ for (i = 0, dest = rsp_buf; i < rsp_len; i++) { printf("%c", *src); src = &rsp_buf[i]; if (*src > 0x20) { /* ':' is reserved for use in placeholder serial * numbers for missing disks */ if (*src == ':') *dest++ = ';'; else *dest++ = *src; } } len = dest - rsp_buf; dest = rsp_buf; /* truncate leading characters */ if (len > MAX_RAID_SERIAL_LEN) { dest += len - MAX_RAID_SERIAL_LEN; len = MAX_RAID_SERIAL_LEN; } memset(serial, 0, MAX_RAID_SERIAL_LEN); memcpy(serial, dest, len); return 0; }

int main() { int fd = open("/dev/sdb", O_RDONLY); if(fd>=0) { __u8 serial[MAX_RAID_SERIAL_LEN]; memset(serial, 0, MAX_RAID_SERIAL_LEN); int err = read_serial(fd, "/dev/sdb", serial); if(err==0) { printf("%s, %s\n", "/dev/sdb\n", (char*)serial); } } close(fd); }

输出结果为 /dev/sdb, WD-WCAVY0965407

scsi提供了若干的命令让我们能同其进行互交，命令为6个字节长，我么使用的查询命令格式如下：

bit→ ↓byte 7 6 5 4 3 2 1 0 0 Operation code = 12h 1 LUN ReservedEVPD 2 Page code 3 Allocation length (MSB) 4 Allocation length (LSB) 5 Control 这里操作码INQUIRY= 12h，表示是查询操作

EVPD设置的为1，按说明返回的应是Vital Product Data(If the EVPD parameter bit is one then the target will return Vital Product Data (VPD).)

Page code为0x80表示的意思为Unit serial number，我们要获取的就是这个了

根据文档spc4r34.pdf第7.8.18节(Unit serial number VPD Page，在7.8节下介绍了各类Vital Product Data Page Code)的说明

返回的内容格式如下

从第5个字节开始就是我们要得到的序列号了

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