[RFA] reiserfs 3.6 on SSD software RAID1 with TRIM/DISCARD on SMP-system doable?

[RFA] reiserfs 3.6 on SSD software RAID1 with TRIM/DISCARD on SMP-system doable?

[Dieter Nützel]

Hello,

I'm on ReiserFS 3.6 since the beginning (under S.u.S.E. :-) even with 
beta stuff.
Now it is time for SSDs.
I migrated one UP workstation (openSUSE 12.2 + stable + etc.) and have 
to switch all other servers + workstations onto SSDs, too.

Please give me your advice if I better should switch to ext4 or 
whatever.
All systems should run your great MD software RAID1 on SSD hopefully 
with TRIM and/or DISCARD.

Thanks,
    Dieter

PS @Neil:
I get /dev/md0 (swap) and poorly /dev/md127 (root).
But YaST created this /etc/mdadm.conf on the first workstation:

DEVICE containers partitions
ARRAY /dev/md0 UUID=bd5xxxxx
ARRAY /dev/md1 UUID=e74xxxxx

Ahhh, now I see something (below).
Can we clean this?

Sonja /home/dieter# cat /proc/mdstat
Personalities : [raid1] [raid0] [raid10] [raid6] [raid5] [raid4]
md0 : active raid1 sdb1[0] sda1[1]
       1051584 blocks super 1.0 [2/2] [UU]
       bitmap: 0/1 pages [0KB], 65536KB chunk

md127 : active raid1 sdb2[0] sda2[2]
       30209920 blocks super 1.0 [2/2] [UU]
       bitmap: 1/1 pages [4KB], 65536KB chunk

unused devices: <none>

Should I generate partition tables on the devices or are the raw 
devices enough?

Re: [RFA] reiserfs 3.6 on SSD software RAID1 with TRIM/DISCARD on SMP-system doable?

[NeilBrown]

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On Thu, 28 Feb 2013 04:29:18 +0100 Dieter Nützel <dieter@nuetzel-hh.de> wrote:

> Hello,
> 
> I'm on ReiserFS 3.6 since the beginning (under S.u.S.E. :-) even with 
> beta stuff.
> Now it is time for SSDs.
> I migrated one UP workstation (openSUSE 12.2 + stable + etc.) and have 
> to switch all other servers + workstations onto SSDs, too.
> 
> Please give me your advice if I better should switch to ext4 or 
> whatever.
> All systems should run your great MD software RAID1 on SSD hopefully 
> with TRIM and/or DISCARD.
> 

Sorry, but I am not in a position to recommend one filesystem over another.
You might get more opinions if you posted somewhere like
linux-raid@vger.kernel.org .

> Thanks,
>     Dieter
> 
> PS @Neil:
> I get /dev/md0 (swap) and poorly /dev/md127 (root).
> But YaST created this /etc/mdadm.conf on the first workstation:
> 
> DEVICE containers partitions
> ARRAY /dev/md0 UUID=bd5xxxxx
> ARRAY /dev/md1 UUID=e74xxxxx
> 
> Ahhh, now I see something (below).
> Can we clean this?

Sorry, but I don't really understand the question.

> 
> Sonja /home/dieter# cat /proc/mdstat
> Personalities : [raid1] [raid0] [raid10] [raid6] [raid5] [raid4]
> md0 : active raid1 sdb1[0] sda1[1]
>        1051584 blocks super 1.0 [2/2] [UU]
>        bitmap: 0/1 pages [0KB], 65536KB chunk
> 
> md127 : active raid1 sdb2[0] sda2[2]
>        30209920 blocks super 1.0 [2/2] [UU]
>        bitmap: 1/1 pages [4KB], 65536KB chunk
> 
> unused devices: <none>
> 
> Should I generate partition tables on the devices or are the raw 
> devices enough?

Either works fine.

NeilBrown

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