#2217 Issue `closed`: RHEL on Power different mpath Backup and Recovery.¶

Labels: support / question, fixed / solved / done

skywallger opened issue at 2019-08-19 04:03:¶

Relax-and-Recover (ReaR) Issue Template¶

Fill in the following items before submitting a new issue
(quick response is not guaranteed with free support):

ReaR version ("/usr/sbin/rear -V"):
- Relax-and-Recover 2.00 / Git
OS version ("cat /etc/rear/os.conf" or "lsb_release -a" or "cat /etc/os-release"):
- OS_VENDOR=RedHatEnterpriseServer
- OS_VERSION=7
ReaR configuration files ("cat /etc/rear/site.conf" and/or "cat /etc/rear/local.conf"):
-OUTPUT=ISO
- BACKUP=NETFS
- BACKUP_URL=nfs://10.209.1.97/ftpbulk
  -BACKUP_PROG_EXCLUDE=("${BACKUP_PROG_EXCLUDE[@]}" '/source' '/mnt/cdrom' '/media' '/var/tmp' '/var/crash')
  -AUTOEXCLUDE_MULTIPATH=n
Hardware (PC or PowerNV BareMetal or ARM) or virtual machine (KVM guest or PoverVM LPAR):
- LPAR on PowerVC
System architecture (x86 compatible or PPC64/PPC64LE or what exact ARM device):
- PPC64
Firmware (BIOS or UEFI or Open Firmware) and bootloader (GRUB or ELILO or Petitboot):
- bootloader GRUB
Storage (local disk or SSD) and/or SAN (FC or iSCSI or FCoE) and/or multipath (DM or NVMe):
- multipath DM
Description of the issue (ideally so that others can reproduce it):
- Backup successfully. and can note recovery because mpathb file not found
  Disk configuration is identical, proceeding with restore.
  No code has been generated to restore device fs:/srv/node/partition1 (fs).
  Please add code to /var/lib/rear/layout/diskrestore.sh to manually install
  it or choose abort.
- Continue
- Abort
  #? 1
  Start system layout restoration.
  Creating partitions for disk /dev/mapper/mpathb (msdos)
  An error occurred during layout recreation.
  rear> multipath -l
  mpatha (36005076380818336840000000000015d) dm-0 IBM ,2145
  size=100G features='1 queue_if_no_path' hwhandler='0' wp=rw
  |-+- policy='service-time 0' prio=0 status=active
  | |- 1:0:0:0 sda 8:0 active undef unknown
  | |- 2:0:0:0 sdc 8:32 active undef unknown
  | |- 3:0:0:0 sde 8:64 active undef unknown
  | - 4:0:1:0 sdh 8:112 active undef unknown-+- policy='service-time 0' prio=0 status=enabled
  |- 1:0:1:0 sdb 8:16 active undef unknown
  |- 2:0:1:0 sdd 8:48 active undef unknown
  |- 3:0:1:0 sdf 8:80 active undef unknown
  `- 4:0:0:0 sdg 8:96 active undef unknown

Verify on OS mpath is math id but different name .
mpathb (36005076380818336840000000000015d) dm-0 IBM ,2145
size=100G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=0 status=active
| |- 1:0:0:0 sda 8:0 active undef unknown
| |- 2:0:0:0 sdc 8:32 active undef unknown
| |- 3:0:0:0 sde 8:64 active undef unknown
| - 4:0:1:0 sdh 8:112 active undef unknown-+- policy='service-time 0' prio=0 status=enabled
|- 1:0:1:0 sdb 8:16 active undef unknown
|- 2:0:1:0 sdd 8:48 active undef unknown
|- 3:0:1:0 sdf 8:80 active undef unknown
`- 4:0:0:0 sdg 8:96 active undef unknown

Workaround, if any:
- - - how to ? why different name mpath.
Attachments, as applicable ("rear -D mkrescue/mkbackup/recover" debug log files):
RESCUE hostshare
rear-hpeshare2.log
rear-hpeshare2.log

:~ # rear -Dv recover
Relax-and-Recover 2.00 / Git
Using log file: /var/log/rear/rear-hpeshare2.log
Running workflow recover within the ReaR rescue/recovery system
Starting required daemons for NFS: RPC portmapper (portmap or rpcbind) and rpc.s tatd if available.
Started RPC portmapper 'rpcbind'.
RPC portmapper 'rpcbind' available.
Started rpc.statd.
RPC status rpc.statd available.
Started rpc.idmapd.
Using backup archive 'backup.tar.gz'
Calculating backup archive size
Backup archive size is 2.2G /tmp/rear.ocTZPkGvOhS8ePt/outputfs/hpeshare2/bac kup.tar.gz (compressed)
Comparing disks.
Disk configuration is identical, proceeding with restore.
No code has been generated to restore device fs:/srv/node/partition1 (fs).
Please add code to /var/lib/rear/layout/diskrestore.sh to manually install i t or choose abort.
++ select choice in '"Continue"' '"Abort"'

Continue
Abort
#? 1
++ '[' Continue = Continue ']'
++ break
Start system layout restoration.
Creating partitions for disk /dev/mapper/mpathb (msdos)
An error occurred during layout recreation.

++ select choice in '"${choices[@]}"'

View Relax-and-Recover log
View original disk space usage
Go to Relax-and-Recover shell
Edit restore script (diskrestore.sh)
Continue restore script
Abort Relax-and-Recover
#?

pcahyna commented at 2019-08-30 08:32:¶

@rmetrich do you please have any idea how this should work?

rmetrich commented at 2019-08-30 09:44:¶

@skywallger
There is no guarantee about the name generated. To have something persistent, /etc/multipath* must be copied into the ISO.
Probably in the OS, you had another disk mapped to mpatha at some time.

rmetrich commented at 2019-09-09 08:38:¶

Hi @skywallger
Checking the "rear mkrescue" log, I can see that you are using rear-2.00 and that your disk is named mpathb (there is no mpatha).
With rear-2.00, /etc/multipath/* content was not included in the ReaR ISO, explaining the issue:
because there is no explicit mapping, then ReaR ISO assigns mpatha to the system disk.

This was fixed with https://github.com/rear/rear/commit/3cf070c1757c6eadbbb5ed05df57e5ba75647d98