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RAID 1 Question
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I creating a file server for a client, I want to set up RAID 1. However, I'd like HD0 (aprox. 2 40-80 GB drives) for the OS. I'd like to set up another HD, HD1 (2 1TB drives for file storage) seperate of the first RAID 1. The files that need to be stored will be large graphic files. This will be my first SCSI - RAID configuration I have ever done, so please forgive my ignorance.
My question is, do I need 2 SCSI controllers to accomplist this? Or can I set up 2 RAID 1 Mirror arrays on 1 SCSI card.
My plan is to back up the HD0 and HD1 (1 TB drive) to off premise location using the Internet via VPN routers.
Any additional information or advice is welcome. Thank you.
My question is, do I need 2 SCSI controllers to accomplist this? Or can I set up 2 RAID 1 Mirror arrays on 1 SCSI card.
My plan is to back up the HD0 and HD1 (1 TB drive) to off premise location using the Internet via VPN routers.
Any additional information or advice is welcome. Thank you.
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Junior Poster in Training
Sorry for the slow response, I don't believe many folks here know much about SCSI RAID. I have a little basic knowledge because I have been investigating using a SCSI RAID controller for a similar application; I would like to use RAID 5 for the primary 3 HDDs and RAID 1 for the secondary storage HDDs using SATA. From what I have found you may do this if you get the right RAID card, but make sure to check the manufacturer first. Best of luck...Mav.
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Originally Posted by Moehang 
I creating a file server for a client, I want to set up RAID 1. However, I'd like HD0 (aprox. 2 40-80 GB drives) for the OS.
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I'd like to set up another HD, HD1 (2 1TB drives for file storage) seperate of the first RAID 1. The files that need to be stored will be large graphic files. This will be my first SCSI - RAID configuration I have ever done, so please forgive my ignorance.
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My question is, do I need 2 SCSI controllers to accomplist this? Or can I set up 2 RAID 1 Mirror arrays on 1 SCSI card.
Real stupidity always beats Artificial Intelligence. (Terry Pratchett)
BA BizMg, MCSE, DCSE, Linux+, Network+
BA BizMg, MCSE, DCSE, Linux+, Network+
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Originally Posted by Maverick223
Sorry for the slow response, I don't believe many folks here know much about SCSI RAID. I have a little basic knowledge because I have been investigating using a SCSI RAID controller for a similar application; I would like to use RAID 5 for the primary 3 HDDs and RAID 1 for the secondary storage HDDs using SATA. From what I have found you may do this if you get the right RAID card, but make sure to check the manufacturer first. Best of luck...Mav.
Real stupidity always beats Artificial Intelligence. (Terry Pratchett)
BA BizMg, MCSE, DCSE, Linux+, Network+
BA BizMg, MCSE, DCSE, Linux+, Network+
First off, thank you for your replies.
Yes, I'm planing on using 2x 80GB HDD in RAID1 for the OS. Then 2x 1TB HDD in RAID1 for file storage. There will not my clients accessing the file server at any one time (2 workstations either retrieving or saving files at any giving time, although probably not at the same time) Do you still think I should use RAID 5 or 6 for the file storage? I don't think the client wants to spend the money for all those HDDs.
BTW, I'm thinking purchasing a Motherboard that supports SATA RAID instead of buying a SCSI card. (4x SATA)
Yes, I'm planing on using 2x 80GB HDD in RAID1 for the OS. Then 2x 1TB HDD in RAID1 for file storage. There will not my clients accessing the file server at any one time (2 workstations either retrieving or saving files at any giving time, although probably not at the same time) Do you still think I should use RAID 5 or 6 for the file storage? I don't think the client wants to spend the money for all those HDDs.
BTW, I'm thinking purchasing a Motherboard that supports SATA RAID instead of buying a SCSI card. (4x SATA)
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the onboard controllers are what we call fakeraid. they are basically almost the same as software based raid, only working through a driver. that makes the raid config not transparent to the OS.
a real raid controller will have it's own cpu, a battery and a memory dimm, and all the parity computation will be performed on the card, not by the main CPU of the system
a real raid controller will have it's own cpu, a battery and a memory dimm, and all the parity computation will be performed on the card, not by the main CPU of the system
Real stupidity always beats Artificial Intelligence. (Terry Pratchett)
BA BizMg, MCSE, DCSE, Linux+, Network+
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Originally Posted by DimaYasny
the usual practice is to set up raid1 for the OS, and a striped raid (5/5E/6/10/50/etc) for the data
Additionally I have to agree with Dima about the RAID controller, I don't believe mobos typically support more than one array (unless it is a server mobo) and they tend to be a little inefficient (slower). However you may be better served by a good SATA RAID card, with onboard RAM to increase the speed.
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1. yes, you need many drives, so I would go for several smaller drives instead of 3 large ones. also the raid policy set in the controller is important for performance
2. mobo controllers support several raid drives, but they are not really raid controllers in the full meaning of the word. you might as well use software raid instead (especially under linux - it is much better)
in striped raid configs you need several drives to increase performance, but make sure you don't have too many. i.e. in raid5 6 drives are fast, 8 drives are optimal, and 10 drives are a bit of a slowdown, so you need to go for raid 50 instead (what you would usually get in large SAN environments)
2. mobo controllers support several raid drives, but they are not really raid controllers in the full meaning of the word. you might as well use software raid instead (especially under linux - it is much better)
in striped raid configs you need several drives to increase performance, but make sure you don't have too many. i.e. in raid5 6 drives are fast, 8 drives are optimal, and 10 drives are a bit of a slowdown, so you need to go for raid 50 instead (what you would usually get in large SAN environments)
Real stupidity always beats Artificial Intelligence. (Terry Pratchett)
BA BizMg, MCSE, DCSE, Linux+, Network+
BA BizMg, MCSE, DCSE, Linux+, Network+
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