我有一台带有两块硬盘的服务器，处于救援模式，因为其中一个磁盘出现故障，必须更换。
我不得不聘请数据恢复服务，几天后他们告诉我数据已经恢复了，但他们无法打开终端来挂载文件系统。所以我打开了 SSH 终端并尝试挂载文件系统。
在救援模式下，我无法使用 fdisk 命令，不可用。因此我尝试使用 lsblk，结果如下：
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 190.9M 1 loop
sda 8:0 0 232.9G 0 disk
sdb 8:16 0 232.9G 0 disk
然后我尝试使用 parted -l 列出分区，结果如下：
Error: /dev/sda: unrecognised disk label
Model: ATA Hitachi HDT72502 (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:
Error: /dev/sdb: unrecognised disk label
Model: ATA Hitachi HDT72502 (scsi)
Disk /dev/sdb: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:
然后我尝试使用 sgdisk -l /dev/sda 列出分区，结果如下：
GPT fdisk (gdisk) version 1.0.6
Warning: Partition table header claims that the size of partition table entries is 257317316 bytes, but this program supports only 128-byte entries.
Adjusting accordingly, but partition table may be garbage.
Warning: Partition table header claims that the size of partition table entries is 164259508 bytes, but this program supports only 128-byte entries.
Adjusting accordingly, but partition table may be garbage.
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries in memory.
Disk /dev/sda: 488397168 sectors, 232.9 GiB
Model: Hitachi HDT72502
Sector size (logical/physical): 512/512 bytes Disk identifier (GUID): 6252014C-6128-5CBC-64B3-43B93D2746D4
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33 First usable sector is 34, last usable sector is 488397134 Partitions will be aligned on 2048-sector boundaries Total free space is 488397101 sectors (232.9 GiB)
Number Start (sector) End (sector) Size Code Name
然后我尝试列出第二个磁盘；sgdisk -l /dev/sdb 得到以下结果：
GPT fdisk (gdisk) version 1.0.6
Warning: Partition table header claims that the size of partition table entries is 0 bytes, but this program supports only 128-byte entries.
Adjusting accordingly, but partition table may be garbage.
Warning: Partition table header claims that the size of partition table entries is 0 bytes, but this program supports only 128-byte entries.
Adjusting accordingly, but partition table may be garbage.
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries in memory.
Disk /dev/sdb: 488397168 sectors, 232.9 GiB
Model: Hitachi HDT72502
Sector size (logical/physical): 512/512 bytes Disk identifier (GUID): CBA264B1-5BCC-54F3-BF89-23B5C2B3733B
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33 First usable sector is 34, last usable sector is 488397134 Partitions will be aligned on 2048-sector boundaries Total free space is 488397101 sectors (232.9 GiB)
Number Start (sector) End (sector) Size Code Name
然后我用 dd if=/dev/sda|hexdump -C 检查了 sda 磁盘是否包含数据，结果是有的。但是 sdb 磁盘是空的：
dd if=/dev/sdb|hexdump -C
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
然后我尝试使用 mdadm --query /dev/sda 获取 RAID 信息，结果如下：
/dev/sda: is not an md array
一些附加信息：我只能远程连接 SSH 终端，并且只能使用这些命令：
agetty devlink e2undo fsck.reiserfs ip lvconvert lvscan mkfs.msdos pvchange route sysctl vgextend
badblocks dhcpcd ethtool fsck.vfat ipmaddr lvcreate mdadm mkfs.reiserfs pvck rtacct tc vgimport
blkdeactivate dmeventd fatlabel fsck.xfs iptunnel lvdisplay mdmon mkfs.vfat pvcreate rtmon telinit vgimportclone
blkdiscard dmraid findfs fsfreeze isosize lvextend mii-tool mkfs.xfs pvdisplay runlevel tipc vgmerge
blkid dmraid-activate fixparts fstab-decode jfs_debugfs lvm mkdosfs mkhomedir_helper pvmove runuser tune2fs vgmknodes
blkzone dmsetup fsadm fstrim jfs_fsck lvmconfig mke2fs mkreiserfs pvremove setcap tunefs.reiserfs vgreduce
blockdev dmstats fsck gdisk jfs_fscklog lvmdiskscan mkfs mkswap pvresize sgdisk unix_chkpwd vgremove
bridge dosfsck fsck.btrfs getcap jfs_logdump lvmdump mkfs.bfs nameif pvs shadowconfig unix_update vgrename
capsh dosfslabel fsck.cramfs getpcaps jfs_mkfs lvmpolld mkfs.btrfs parted pvscan shutdown vgcfgbackup vgs
cgdisk dumpe2fs fsck.ext2 getty jfs_tune lvmsadc mkfs.cramfs partprobe rarp slattach vgcfgrestore vgscan
chcpu e2fsck fsck.ext3 halt killall5 lvmsar mkfs.ext2 pivot_root raw start-stop-daemon vgchange vgsplit
coldreboot e2image fsck.ext4 hdparm kpartx lvreduce mkfs.ext3 plipconfig reboot sulogin vgck wipefs
ctrlaltdel e2label fsck.fat hwclock ldconfig lvremove mkfs.ext4 pm-hibernate reiserfsck swaplabel vgconvert xfs_repair
debugfs e2mmpstatus fsck.jfs ifconfig logsave lvrename mkfs.fat pm-suspend reiserfstune swapoff vgcreate zramctl
debugfs.reiserfs e2scrub fsck.minix init losetup lvresize mkfs.jfs pm-suspend-hybrid resize2fs swapon vgdisplay
debugreiserfs e2scrub_all fsck.msdos installkernel lvchange lvs mkfs.minix poweroff resize_reiserfs switch_root vgexport
我该如何恢复分区？我认为这是不可能的，但我一直在尝试，因为他们告诉我数据仍然可以恢复。
非常感谢您的任何建议，提前致谢。