Re: [OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-25 Thread Udo Grabowski (IMK) 

On 25/01/2018 15:39, Reginald Beardsley via openindiana-discuss wrote:

I lost the disk on my OI_151a8 system.  The swap area was going bad.  So I booted 
from a 2017.10 Hipster DVD, imported the old drive and copied everything to another 
disk using  a USB <-> SATA adaptor.

The evolving nature of ZFS makes the traditional miniroot problematic.  If the 
ZFS implementation in the miniroot image is older than the version on disk, it 
won't help.

I've been underwhelmed by the recovery from a failed disk on Solaris 10 u8, 
however, I think much of the issue there was the HP Z400 BIOS. After migrating 
from 1 TB to 2 TB disks by replacing individual disks, when I removed the last 
1 TB disk it would not boot until I had swapped the appropriate cables.  I have 
a peculiar setup, 3 disks with the root pool in a 3 way mirror in s0 and a 
RAIDZ1 export pool in s1.  Resilvering the RAIDZ1 disks was *very* slow. It 
would have been quicker to setup the root pool, create the export pool and then 
zfs receive the export pool image from the mirrored scratch pool where I'd put 
it before I started the migration.


Putting these into /etc/system (from an oi151a9 machine) and reboot
should shrink your resilver times (with an affordable IO slowdown for
normal applications):

set zfs:zfs_resilver_delay = 0
set zfs:zfs_scrub_delay = 0
set zfs:zfs_top_maxinflight = 127
set zfs:zfs_resilver_min_time_ms = 5000

Typical scrub/resilvers are an hour for 150 GB data, compared to
nearly a day with the default parameters (which let resilver/scrub
only run when nearly nothing runs on the machines).

You should also put these into /etc/system to get crash dumps
if something ever panics:

* disable multithread dump (hangs)
set dump_plat_mincpu=0
set dump_bzip2_level=1
set pcplusmp:apic_panic_on_nmi=1

Hope that helps.
--
Dr.Udo Grabowski   Inst.f.Meteorology & Climate Research IMK-ASF-SAT
http://www.imk-asf.kit.edu/english/sat.php
KIT - Karlsruhe Institute of Technology   http://www.kit.edu
Postfach 3640,76021 Karlsruhe,Germany T:(+49)721 608-26026 F:-926026

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Re: [OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-25 Thread Reginald Beardsley via openindiana-discuss 
I lost the disk on my OI_151a8 system.  The swap area was going bad.  So I 
booted from a 2017.10 Hipster DVD, imported the old drive and copied everything 
to another disk using  a USB <-> SATA adaptor.

The evolving nature of ZFS makes the traditional miniroot problematic.  If the 
ZFS implementation in the miniroot image is older than the version on disk, it 
won't help.

I've been underwhelmed by the recovery from a failed disk on Solaris 10 u8, 
however, I think much of the issue there was the HP Z400 BIOS. After migrating 
from 1 TB to 2 TB disks by replacing individual disks, when I removed the last 
1 TB disk it would not boot until I had swapped the appropriate cables.  I have 
a peculiar setup, 3 disks with the root pool in a 3 way mirror in s0 and a 
RAIDZ1 export pool in s1.  Resilvering the RAIDZ1 disks was *very* slow. It 
would have been quicker to setup the root pool, create the export pool and then 
zfs receive the export pool image from the mirrored scratch pool where I'd put 
it before I started the migration. 


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Re: [OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-25 Thread Jim Klimov 
On January 24, 2018 10:55:21 PM UTC, Jerry Kemp  wrote:
>Had a bad power outage (another story un-into itself) at home,
>apparently took multiple drives out on an older OpenIndiana 
>(pre-Hipster) system.  I believe the OS (SSD) drive is OK, and I
>believe that I probably forgot to set the zfs fail=continue switch 
>on the other pools.
>
>My yahoo-fu must be off, I've been looking at wiki.openindiana.org and
>docs.openindiana.org .
>
>I'm sure I'm just missing the obvious, but can someone share the
>details of a failsafe boot for an older, pre-Hipster OpenIndiana 
>install please?
>
>Thank you,
>
>Jerry
>
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Alas there is no preinstalled failsafe sine OpenSolaris. I had reasonable 
success using Firefly as a BE and/or as a miniroot stored in the main BE, and 
published scripts I use to manage that setup - mostly needed to switch device 
paths saved into rpool when I dual-boot OI as VM or Physical OS on my laptop.

If your system can boot from CD/DVD or USB, I suggest you take the install 
media, or firefly, or ... and zpool import your pools and perhaps mount the 
desired rootfs to manage it. For just GRUB menu setup and zpool settings you 
shouldn't need to even mount rootfs datasets.

Jim
--
Typos courtesy of K-9 Mail on my Android

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Re: [OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-24 Thread Jerry Kemp 

thanks for the quick reply Andrew!!



On 24/01/18 18:49, Andrew Gabriel wrote:

On 24/01/2018 22:55, Jerry Kemp wrote:
Had a bad power outage (another story un-into itself) at home, apparently took multiple drives out on an older OpenIndiana 
(pre-Hipster) system.  I believe the OS (SSD) drive is OK, and I believe that I probably forgot to set the zfs fail=continue 
switch on the other pools.


My yahoo-fu must be off, I've been looking at wiki.openindiana.org and 
docs.openindiana.org .

I'm sure I'm just missing the obvious, but can someone share the details of a failsafe boot for an older, pre-Hipster OpenIndiana 
install please?


At the grub menu, move to the BE you want to boot and type 'e' (for edit).
Use cursor keys and add "-m milestone=none" to the boot command line options.
Come out of edit mode (can't remember how off-hand, but it probably tells you 
on bottom of screen, maybe Esc or Return).
Type 'b' to boot.



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Re: [OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-24 Thread Andrew Gabriel 

On 24/01/2018 22:55, Jerry Kemp wrote:
Had a bad power outage (another story un-into itself) at home, 
apparently took multiple drives out on an older OpenIndiana 
(pre-Hipster) system.  I believe the OS (SSD) drive is OK, and I 
believe that I probably forgot to set the zfs fail=continue switch on 
the other pools.


My yahoo-fu must be off, I've been looking at wiki.openindiana.org and 
docs.openindiana.org .


I'm sure I'm just missing the obvious, but can someone share the 
details of a failsafe boot for an older, pre-Hipster OpenIndiana 
install please?


At the grub menu, move to the BE you want to boot and type 'e' (for edit).
Use cursor keys and add "-m milestone=none" to the boot command line 
options.
Come out of edit mode (can't remember how off-hand, but it probably 
tells you on bottom of screen, maybe Esc or Return).

Type 'b' to boot.

--
Andrew

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[OpenIndiana-discuss] failsafe boot howto on older OpenIndiana system

2018-01-24 Thread Jerry Kemp 
Had a bad power outage (another story un-into itself) at home, apparently took multiple drives out on an older OpenIndiana 
(pre-Hipster) system.  I believe the OS (SSD) drive is OK, and I believe that I probably forgot to set the zfs fail=continue switch 
on the other pools.


My yahoo-fu must be off, I've been looking at wiki.openindiana.org and 
docs.openindiana.org .

I'm sure I'm just missing the obvious, but can someone share the details of a failsafe boot for an older, pre-Hipster OpenIndiana 
install please?


Thank you,

Jerry

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