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Old 11-06-2014, 01:53 AM   #1
WiseDraco
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SSHD and software raid?


Hello!
Do anyone there investigated or created software raid on sshd disc?
in close future i look to ST2000DX001 discs.
now i have two 1Tb hdd in software raid 1, think about a bit bigger space for home desktop....
thanks in advance and information...
 
Old 11-06-2014, 09:51 AM   #2
NathanBarley
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Quote:
Originally Posted by WiseDraco View Post
Hello!
Do anyone there investigated or created software raid on sshd disc?
in close future i look to ST2000DX001 discs.
now i have two 1Tb hdd in software raid 1, think about a bit bigger space for home desktop....
thanks in advance and information...
I haven't done it, (I'm assuming you meant SSD's - SSHD confused me for a moment ) but my main thought would be what happens with trim; as far as I know, mdtrim (Linux's software RAID) supports it.

Outside of that, they should behave like spinners.
 
Old 11-07-2014, 03:03 AM   #3
rouvas
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Why would you want RAID on SSD disks?
 
Old 11-07-2014, 03:07 AM   #4
WiseDraco
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Quote:
Originally Posted by rouvas View Post
Why would you want RAID on SSD disks?

in case of SSHD ( hybrid of small SSD and large HDD) we have, i assume ( not know firmly) one disc with start 8 Gb of ssd and other of hdd space, or it sees as two hdd?

in any case, in ssd live OS data for fast boot, i think. also i think, OS too is be good to prone of hdd failure, as so, i plan make software raid 1 from two discs...
 
Old 11-07-2014, 03:14 AM   #5
sag47
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Quote:
Originally Posted by rouvas View Post
Why would you want RAID on SSD disks?
Why not? RAID has the same effect with regards to speed up on SSD as it does on an HDD. RAID0 on two SSDs rule.

Regarding the original question about RAID on a hybrid HDD (I don't like SSHD term because it confuses with sshd the secure shell daemon); you need to have a small, non-RAID, partition for /boot when using a software RAID because the hardware isn't aware of software RAID. So the non-RAID /boot partition takes care of booting up the RAID drives. Google mdadm boot RAID and you should find plenty of tutorials on the subject.

SAM
 
Old 11-07-2014, 03:37 AM   #6
WiseDraco
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Originally Posted by sag47 View Post
Why not? RAID has the same effect with regards to speed up on SSD as it does on an HDD. RAID0 on two SSDs rule.

Regarding the original question about RAID on a hybrid HDD (I don't like SSHD term because it confuses with sshd the secure shell daemon); you need to have a small, non-RAID, partition for /boot when using a software RAID because the hardware isn't aware of software RAID. So the non-RAID /boot partition takes care of booting up the RAID drives. Google mdadm boot RAID and you should find plenty of tutorials on the subject.

SAM
cannot understand, why i need to be /boot on non-raided partition?

now i have soft raid on old, traditional hdd, and have a three partitions mapping - / on hdd, where is all system, home and boot too, another -"second" - for data, and another for swap.
all three partitions be in raid1 via linux software raid. all works good, tested to turn off one disc, and all start ok ( in degraded mode, sure, but...)
there is questionable about have swap partition in raid too, but as for /boot, i do not see, why i must have boot on non-raid. also it degraded raid1 idea in much way - if my non-raided boot device has break, i cannot start OS without manual work...
 
Old 11-07-2014, 05:23 AM   #7
sag47
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Ah I was thinking RAID0 software RAID requires /boot. RAID1 should be okay so long as it can be booted from using the MBR on the disk. You mentioned software RAID in your first post so I was thinking along RAID0.

Last edited by sag47; 11-07-2014 at 05:27 AM.
 
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Old 11-07-2014, 11:12 AM   #8
chemfire
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Have looked into BTRFS here, it might be your friend. I have been using it for RAID ever my three ssds for a while with no problems.
 
  


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