[SATLUG] Does my HDD raid setup need improvement?

Chris Lemire good_bye300 at yahoo.com
Sun Oct 19 00:50:10 CDT 2008





----- Original Message ----
From: Borries Demeler <demeler at biochem.uthscsa.edu>
To: satlug at satlug.org
Sent: Saturday, October 18, 2008 1:34:49 PM
Subject: Re: [SATLUG] Does my HDD raid setup need improvement?

With so much horsepower & space I wouldn't worry about giving up a bit of performance
and would set up the sda and sdb partitions as RAID1. You pay a bit of a performance
penalty for peace of mind. Alternatively you could run RAID 5 if you make 3 500 GB
partitions and include them in your RAID setup.

Nice box! I wished I had one like this :-) How many watts does that PS suck up?

-b.
> 
> My current computer set up is:
> 
> Hardware
> CPU = Intel Q6600 @ 3.2ghz -- idles at 31c
> Mobo = EVGA 122-CK-NF68-A1 LGA 775 NVIDIA nForce 680i SLI ATX
> Mem = 4gb (4x1) DDR2 800mhz ( pair of CORSAIR XMS2 and PNY XLR8)
> GPU = Nvidia 8800 GTS 640mb -- 54c
> HDD = Raid 0 -- HITACHI Deskstar 7K1000 750GB 7200 RPM 32MB Cache SATA
> 3.0Gb/s Hard Drive  -- 29c
> HDD  = back up SAMSUNG SpinPoint T Series 500GB 7200 RPM 16MB Cache
> SATA 3.0Gb/s Hard Drive -- 21c
> CPU Cooler = After market air cooler -- ZEROtherm Nirvana NV120 120mm
> Case = Antec Nine Hundred
> 
> Software
> Dual Boot Winblows Ulimate x64 & Ubuntu 8.04 x64
> Ubuntu is the only OS in Raid 0.
> 
> When originally installing Windblows, it BSOD with raid(mobo fake
> raid), 4 sticks of ram, and GPU driver.  When
> installing had to remove raid and ram sticks to update OS first; then
> had to update GPU driver;  Could not get it to boot other wise.
> 
> I don't think my setup is best.  Using linux software raid.  I would
> like to have performance and back up on my HDD's.  I didn't go with
> raid 5 cause I don't know how to restore in case failure occurs.  I
> manually copy files onto the 500gb spare drive; I tried sbackup app
> not working right as far as I can tell.  Does my set up need
> improvement?  What do you guys recommend?  I would like performance.
> I am willing to spend a few bucks to make improvements (add HDD's) if
> necessary.
> 
> 2 -750gb are partitioned --  500gb off of each for raid 0, 50mb off of
> each for boot (wouldn't let me have it in raid 0), 250 gb off one for
> Vista, and a 250gb blank ext3.
> 1 500GB is my manual backup.
> 
> 
> mike at ubuntu:~$ sudo fdisk -l
> [sudo] password for mike:
> 
> Disk /dev/sda: 750.1 GB, 750156374016 bytes
> 255 heads, 63 sectors/track, 91201 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x936d138a
> 
>  Device Boot      Start        End      Blocks  Id  System
> /dev/sda1              1      31865  255955581  83  Linux
> /dev/sda2  *      91196      91201      48195  fd  Linux raid autodetect
> /dev/sda3          31866      91195  476568225  fd  Linux raid autodetect
> 
> Partition table entries are not in disk order
> 
> Disk /dev/sdb: 750.1 GB, 750156374016 bytes
> 255 heads, 63 sectors/track, 91201 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0xd952c54c
> 
>  Device Boot      Start        End      Blocks  Id  System
> /dev/sdb1  *          1      31871  256000000    7  HPFS/NTFS
> /dev/sdb2          91196      91201      48195  fd  Linux raid autodetect
> /dev/sdb3          31872      91195  476520030  fd  Linux raid autodetect
> 
> Partition table entries are not in disk order
> 
> Disk /dev/sdc: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x9f91ce44
> 
>  Device Boot      Start        End      Blocks  Id  System
> /dev/sdc1              1      60801  488384001  83  Linux
> 
> Disk /dev/md1: 49 MB, 49283072 bytes
> 2 heads, 4 sectors/track, 12032 cylinders
> Units = cylinders of 8 * 512 = 4096 bytes
> Disk identifier: 0x00000000
> 
> Disk /dev/md1 doesn't contain a valid partition table
> 
> Disk /dev/md0: 975.9 GB, 975962177536 bytes
> 2 heads, 4 sectors/track, 238272016 cylinders
> Units = cylinders of 8 * 512 = 4096 bytes
> Disk identifier: 0x00000000
> 
> Disk /dev/md0 doesn't contain a valid partition table
> -- 
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If you want performance, you should be aware that having 4 sticks of memory gives you more latency, 2T (Timing). It's better to have 2x2gb sticks than 4x1gb sticks. I think the ultimate raid is supposed to be raid10, gives you the best of both worlds with a minimum of 4 hard drives. That's what I plan on eventually when I have 2 more drives. Right now I have raid1 because I only have 2 drives.

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