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Hi,
I've recently bought a DNS-323 and installed a pair of Samsung 500GB disks. My idea was to create a 200GB mirrored (RAID-1) partition and a striped (RAID-0) partition of the remaining 600GB. However, after creating the RAID-1 partition, the DNS-323 will automatically create a linear (JBOD) partition of the rest of the disk space and there isn't any option to change this.
My question is: How can I create a RAID-0 array instead? I've installed fun_plug and telnet and I've read about the mdadm utility, but I need some advice before continuing. I have no data stored on 600GB JBOD partition, it could be removed.
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I'd be interested in this too. Anyone?
My only guess would be editing /etc/raidtab and then reformating (raid-level linear to raid-0). But I have no idea about /etc/raidtab2web, and how would the unexpected configuration interfere with dlink's raid utilities (raidlevel_parser, raidsync_time, raidtab_parser)
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Hello to everyone (this is my first post by the way),
What would be the benefit of such configuration ? It would probably increase transfer rate, as both disks would work in parallel. But the bottleneck will be the ethernet giga port, correct ?
Vincent, waiting for his DNS-323
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Hi,
Well 1Gbit/s perfectly used amounts to transfer rates up to 120MiB/s. With a couple Seagate Barracuda's (7200 250GB 16MiB - ST3250620AS 3.AA) I get these (very crude) transfer rates:
read RAID-1 52MiB/s write RAID-1 44MiB/s read JBOD 44MiB/s write JBOD 44MiB/s
I got these numbers reading and writing a 256MiB file in situ with dd. As you can see, you do get a (rather small, tough) boost from RAID. The limiting factor is most likely the CPU, though I may have my drives set to SATA-150 (I'm unsure). If it is the CPU, samba will be a lot slower, which is consistent with reported speeds of 20MiB/s reads and 15MiB/s writes (still enough to exhaust a 10Mbit/s LAN, but not 1Gbit/s).
Anyway, I like to tinker with thinks, and I do run Debian on the JBOD partition, so I'm interested in local performance too.
Last edited by kruzes (2007-05-31 19:07:22)
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Curious regarding how this configuration affects recovery...if a drive fails you'll lose all the RAID0 data, right? I assume the RAID1 mirror would rebuild when you inserted a new drive to replace the failed one, and you'd have to recreate your RAID0 partition...can someone clarify how recovery would work in this setup?
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DNS-323 Talker wrote:
Curious regarding how this configuration affects recovery...if a drive fails you'll lose all the RAID0 data, right? I assume the RAID1 mirror would rebuild when you inserted a new drive to replace the failed one, and you'd have to recreate your RAID0 partition...can someone clarify how recovery would work in this setup?
According to DLINK, it should be very simple: RAID1 rebuilt with same config, and remainig space as part of JBOD space, even if the new drive is bigger. Waiting for my dns-323 to verify....
Date of Reply: 5/25/2007
Products: DNS-323
Operating System: Windows XP Pro
Vincent
Oh yes it will... It will take any remaining space and create a separate drive, No mater what larger size you use on eather side of the DNS-323 it will create a JBOD drive with the left over and the RAID remains the same size.
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