Hello,
I was wondering if someone could help me, I'm putting together a Server for personal use, I want to virtualize a few servers(mail, web, ssh) and use it as a NAS, but I have a question if I can use Multiple RAID Arrays using the following HW:
Intel Xeon Quad Core X3430 ASUS P7F-M LGA 1156 - LSI MegaRAID(integrated) - HighPoint RocketRAID 2640x1 2 Hitachi 500GB HDDs 4 Hitachi 1TB HDDs
I want to use one array with the 2 500GB HDDs in RAID1 for the OS and for some VMs, and the other 4 1TB HDDs I want to create an array in RAID5 or RAID10 for file sharing across my home Network. I found a guide but it's a little bit outdated and it's for Debian...
Do you have any other pointer I can read/use?
TIA.
On 30/01/2010 12:09 PM, Victor Padro wrote:
Hello,
I was wondering if someone could help me,
I'll try...
I want to use one array with the 2 500GB HDDs in RAID1 for the OS and for some VMs,
That will work OK.
and the other 4 1TB HDDs I want to create an array in RAID5 or RAID10 for file sharing across my home Network.
You can use these disks in a RAID5 array, but not RAID10. I fairly sure you need more than 4. RAID10 is mirrored, so you only have "2" disks in the array, which isn't enough for parity/striping stuff. You need at least "3", which would mean 6 disks for RAID10.
Having said that, I'm assuming you want to use the entire hard disk as a participant in an array. You could create 2 x 500Gb partions on each disk and then you have 8 x 500Gb partitions to use in a RAID10 array. This approach sacrifices some redundancy though. If a disk dies entirely, then you will lose two participants in the RAID array, which may or may not be catastrophic - it depends on what you put where...
I found a guide but it's a little bit outdated and it's for Debian...
Do you have any other pointer I can read/use?
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
I've mostly installed RAID arrays at install time, which you'll need to do as well if you want to put the OS on a RAID1 array.
TIA.
Ian
On Fri, Jan 29, 2010 at 9:09 PM, Ian Blackwell ian@ikel.id.au wrote:
On 30/01/2010 12:09 PM, Victor Padro wrote:
Hello,
I was wondering if someone could help me,
I'll try...
I want to use one array with the 2 500GB HDDs in RAID1 for the OS and for some VMs,
That will work OK.
and the other 4 1TB HDDs I want to create an array in RAID5 or RAID10 for file sharing across my home Network.
You can use these disks in a RAID5 array, but not RAID10. I fairly sure you need more than 4. RAID10 is mirrored, so you only have "2" disks in the array, which isn't enough for parity/striping stuff. You need at least "3", which would mean 6 disks for RAID10.
Having said that, I'm assuming you want to use the entire hard disk as a participant in an array. You could create 2 x 500Gb partions on each disk and then you have 8 x 500Gb partitions to use in a RAID10 array. This approach sacrifices some redundancy though. If a disk dies entirely, then you will lose two participants in the RAID array, which may or may not be catastrophic - it depends on what you put where...
I found a guide but it's a little bit outdated and it's for Debian...
Do you have any other pointer I can read/use?
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
I've mostly installed RAID arrays at install time, which you'll need to do as well if you want to put the OS on a RAID1 array.
TIA.
Ian
RAID10 does not use parity, it's just a mirror of stripes, so 4 disks will work perfectly fine with it.
Use RAID10 for speed, and RAID5 if the space is more of an issue. With RAID10 you lose 1/2 the total space, and with RAID5 you lose 1 disk's worth.
On Jan 29, 2010, at 9:16 PM, Brian Mathis brian.mathis@gmail.com wrote:
On Fri, Jan 29, 2010 at 9:09 PM, Ian Blackwell ian@ikel.id.au wrote:
On 30/01/2010 12:09 PM, Victor Padro wrote:
Hello,
I was wondering if someone could help me,
I'll try...
I want to use one array with the 2 500GB HDDs in RAID1 for the OS and for some VMs,
That will work OK.
and the other 4 1TB HDDs I want to create an array in RAID5 or RAID10 for file sharing across my home Network.
You can use these disks in a RAID5 array, but not RAID10. I fairly sure you need more than 4. RAID10 is mirrored, so you only have "2" disks in the array, which isn't enough for parity/striping stuff. You need at least "3", which would mean 6 disks for RAID10.
Having said that, I'm assuming you want to use the entire hard disk as a participant in an array. You could create 2 x 500Gb partions on each disk and then you have 8 x 500Gb partitions to use in a RAID10 array. This approach sacrifices some redundancy though. If a disk dies entirely, then you will lose two participants in the RAID array, which may or may not be catastrophic - it depends on what you put where...
I found a guide but it's a little bit outdated and it's for Debian...
Do you have any other pointer I can read/use?
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
I've mostly installed RAID arrays at install time, which you'll need to do as well if you want to put the OS on a RAID1 array.
TIA.
Ian
RAID10 does not use parity, it's just a mirror of stripes, so 4 disks will work perfectly fine with it.
Use RAID10 for speed, and RAID5 if the space is more of an issue. With RAID10 you lose 1/2 the total space, and with RAID5 you lose 1 disk's worth.
Small correction RAID10 is a stripe of mirrors rather then a mirror of stripes which does not provide the same resiliency.
-Ross
On Fri, Jan 29, 2010 at 8:09 PM, Ian Blackwell ian@ikel.id.au wrote:
On 30/01/2010 12:09 PM, Victor Padro wrote:
Hello,
I was wondering if someone could help me,
I'll try...
I want to use one array with the 2 500GB HDDs in RAID1 for the OS and for some VMs,
That will work OK.
and the other 4 1TB HDDs I want to create an array in RAID5 or RAID10 for file sharing across my home Network.
You can use these disks in a RAID5 array, but not RAID10. I fairly sure you need more than 4. RAID10 is mirrored, so you only have "2" disks in the array, which isn't enough for parity/striping stuff. You need at least "3", which would mean 6 disks for RAID10.
Having said that, I'm assuming you want to use the entire hard disk as a participant in an array. You could create 2 x 500Gb partions on each disk and then you have 8 x 500Gb partitions to use in a RAID10 array. This approach sacrifices some redundancy though. If a disk dies entirely, then you will lose two participants in the RAID array, which may or may not be catastrophic - it depends on what you put where...
I found a guide but it's a little bit outdated and it's for Debian...
Do you have any other pointer I can read/use?
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
I've mostly installed RAID arrays at install time, which you'll need to do as well if you want to put the OS on a RAID1 array.
TIA.
Ian _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Thank you Ian, but I disagree in your concept of RAID10:
[quote] RAID 10 RAID 1+0 (or 10) is a mirrored data set (RAID 1) which is then striped (RAID 0), hence the "1+0" name. A RAID 1+0 array requires a minimum of four drives: two mirrored drives to hold half of the striped data, plus another two mirrored for the other half of the data. In Linux MD RAID 10 is a non-nested RAID type like RAID 1, that only requires a minimum of two drives, and may give read performance on the level of RAID 0. [quote]
I'll read that howto, is for fakeRAID though...
TIA
On 30/01/2010 1:42 PM, Victor Padro wrote:
I'll read that howto, is for fakeRAID though... TIA
Yes, I got RAID10 wrong - knew I would (haven't used it before). If you're using hardware RAID, then the Op/Sys will just see two disks and you don't really need a HowTo. How you partition/use them is up to you when you install. I know there is continuous debate about hardware vs. software RAID, but I've only ever had problems with hardware, and never any problems with software. Your mileage may vary :)
Ian
[quote] RAID 10 RAID 1+0 (or 10) is a mirrored data set (RAID 1) which is then striped (RAID 0), hence the "1+0" name. A RAID 1+0 array requires a minimum of four drives: two mirrored drives to hold half of the striped data, plus another two mirrored for the other half of the data. In Linux MD RAID 10 is a non-nested RAID type like RAID 1, that only requires a minimum of two drives, and may give read performance on the level of RAID 0. [quote]
Please do note that md raid10 IS different from doing nested md raid1+0.
The md raid10 module does other fancy stuff.
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Brian Mathis -
Christopher Chan -
Ian Blackwell -
Ross Walker -
Victor Padro