0
votes
1answer
26 views

Recommended RAID5 stripe size?

I have a RAID5 array built from 4 1TB drives. I initially set the stripe size to 1M since I will be storing large files (much larger than 1MB). The NTFS cluster size is 64KB (largest possible). ...
5
votes
2answers
81 views

Would an array of SSD drives be able to succesfully substitute the system memory?

I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the ...
1
vote
0answers
423 views

Very slow volume expand on Synology ds2413+

I've posted this elsewhere on the internet aswell, and will obviously reply in both places if a proper solution is found. I am attempting to expand SHR volumne (2x4TB, 1x2TB) with additional 4TB ...
0
votes
1answer
368 views

Windows Dynamic Disks vs BIOS FakeRAID

I have two 3TB disks in a Windows 7 Dynamic Disk Mirror array (effectively, software RAID1). Apart from being tied to the O/S (I can't mount the array in Linux, for example) - is there any difference ...
-2
votes
1answer
529 views

How can I achieve maximum sustained sequential disk write performance?

I need data write rates of ~1 GB/sec sustained for ~1 hour. Data is coming in over this PCIe x4 frame grabber. I need to stream its full bandwidth to disk. I don't have experience with RAID, but as ...
2
votes
1answer
182 views

Test RAID array read write speeds from boot disk

I have a VMware ESXi server with a local RAID 5 datastore formatted with VMFS. The RAID controller is a DELL PERC H710 hardware controller and the server is an R620. I get abysmal write speeds, ...
1
vote
1answer
113 views

Troubleshooting major performance issue: Is culprit Intel RST, Hard drive, or something else?

The Setup I have the following components that come into play in this situation: ASUS P8Z68 V/PRO motherboard a RAID1 configuration (1x 1TB drive, 1 x 2TB drive -- I explain below), accelerated ...
1
vote
1answer
240 views

RAID 5 degraded performance

I'm currently rebuilding my fileserver, but because of SATA port limitations, I can only use 5 disks at a time. I've remove a drive from my original RAID, so I've been able to create a new degraded ...
1
vote
1answer
187 views

RAID0 SSD performance degredation

I have a computer built to acquire uncompressed 2048 x 2048 16 bit images at 100 frames per second in real time, writing to disk. A RAID0 of SSDs is thus the only option. For the past month or so, ...
1
vote
4answers
716 views

RAID 6 that can read with least 1000 Mbit/s?

I purchased a Dell PERC 6/i which I expected to be able to read with 1000 Mbps. There is not much to do now, but there are some things I wanted knowledge about for another time. I have configured it ...
0
votes
1answer
31 views

Checking drive healh of RAID 0 with MOBO built-in RAID

I have the following MOBO: IPMTB-TK (Truckee) motherboard for HP Pavilion Elite HPE-490t. I have 2 WD Blacks in RAID 0 mode. I was wondering if there is a way to view the status of each drive and ...
1
vote
1answer
742 views

What do I need to saturate a 6Gb/s SATA connection?

I know the throughput of a standard HDD doesn't quite saturate a 6Gb/s connection (if someone has a numerical value, that would be great). I have been told that the only way to reasonably saturate ...
0
votes
1answer
301 views

Terrible write speeds with Z77 Intel 510 RAID 0

I just bought an Asus P8Z77-V Pro board today, connected my old Intel 510's in RAID 0 mode on the Intel controller and installed Windows 7. I'm gettings read speeds of around 900mb/s, but the writes ...
1
vote
0answers
242 views

At what point does RAID 0 stop being fast and just become dangerous? [closed]

I have an interesting RAID setup across 2 harddrives on my home computer. I have /tmp and a mount point(/home/machines) for virtual machines (along with a few other mount points). These partitions I ...
1
vote
1answer
97 views

RAID 1 : one device reads while the other writes symmetrically. What is going on?

Take a look at the disk throughput of this two disk software RAID 1 array in a Linux 2.6.26-2-686 Debian system : As you can see, one device reads at a speed apparently close to its top throughput ...
2
votes
1answer
382 views

8 hard drives, very same model, software RAID0, terrible performance

I have 8 hard drives in my PC, assigned as storage. Three of them are attached to the mainboard. Four of them are attached to a controller [ SiL 3114 ] One of them attached to an another ...
4
votes
4answers
4k views

Does RAID1 increase performance with Linux mdadm?

I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4. Will this ...
0
votes
1answer
100 views

Can different models of drives be arranged in RAID 0

Given one WD Caviar Black 2TB and WD Caviar Green 1.5TB please tell me the following: Can these two be stripped (RAID 0)? Will there be a performance increase, or would using WD Black as a system ...
1
vote
1answer
3k views

Performance of RAID 5 with mdadm

I have set up a software-raid 5 with mdadm on a 1.3 GHz AMD Neo 36L dual core machine using 3 1.5 TB Seagate Barracude Green drives (4k sectors). The chunk size of the raid is 512 KB. On top of the ...
6
votes
1answer
506 views

Strange performance from RAID5 using WD RE4 disks

I've noticed a bit of a performance issue with some WD RE4 drives I'm using under AMD's hardware RAID solution. First a bit of background: Environment: Windows 7 home premium x64 HDD's: 3x 1TB WD ...
1
vote
2answers
748 views

Does chunk size affect the read performance of a Linux md software RAID1 array?

This came up in relation to this question on determining chunk size of an existing RAID array. The general consensus seems to be that chunk size does not apply to RAID1 as it is not striped. On the ...
2
votes
2answers
2k views

Can a Raid5 array be optimized using defragmenting or other maintenance tools?

I have a Lian Li Ex-50 Raid Array setup to be 4x 2TB WD Black in a Raid5 formatted to HFS+ (journaled). The raid array is a hardware raid running through a Sil3132 chipset (SATA2 via eSata ...
11
votes
4answers
1k views

Is it worth buying SSDs for a RAID?

Im seeing people using SSDs for RAID-0 and getting excellent improvements in read/write rates. But now there is a good opportunity to acquire another SSD Force Corsair F60 identical to mine. I'm ...
2
votes
1answer
893 views

Can I RAID 0 two secondary drives without involving my primary disk?

I have a 60GB SSD as my primary OS drive. It has a few core applications on it, but because of the size, I don't want to put too much on it. My intention is to get two 1TB drives to use as storage ...
4
votes
7answers
13k views

Should I use “Raid 5 + spare” or “Raid 6”?

What is "Raid 5 + Spare" (excerpt from User Manual, Sect 4.17.2, P.54): RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is used as spare to rebuild the system as soon as a disk fails ...
0
votes
2answers
388 views

SiI 3114 vs. ICH7R RAID performance

I just got two new WD5000AAKS 500GB SATA 3.0Gb/s drives, and I need to put them in a RAID-0 array (I know that motherboard-RAID generally isn't the best for speed increases, but I have little choice). ...
3
votes
2answers
2k views

Is it normal for Windows Software Raid (Mirroring) to slow a drive's performance?

I've been doing some performance tests on a few of my drives lately, trying to figure out which combination of drive/raid-level(or not) will give me the best performance (for Hyper-V incase anyone's ...
6
votes
3answers
3k views

Practical RAID Performance?

I've always thought the following to be a general rule of thumb for RAID: RAID 0: Best performance for READ and WRITE from stripping, greatest risk RAID 1: Redundant, decent for READ (I believe it ...
2
votes
3answers
347 views

Will setting up a RAID-0 array boost my IO performance?

I currently have a single 640 WD HDD with 16MB cache. Sometimes during heavy I/O usage the machine slows down. Would I benefit much by getting a second HDD identical to the first and setting up a ...
3
votes
1answer
139 views

Is Splitting IDE hdds between Primary and Secondary faster?

I'm doing RAID 0 on two IDE harddrives (yes, this is old hardware). Will the harddrives be faster if I attach them separately so that one is on the Primary IDE controller and the other is on the ...
3
votes
1answer
1k views

LVM vs /dev/md0 performance problem

I am trying to tune my NAS, running openfiler, and wondering why I'm getting relatively poor read performance from 4 WD RE3 drives in RAID 5. When I run hdparm on the meta device I get the levels of ...
3
votes
6answers
6k views

Can someone explain RAID-0 in plain English?

I've heard about and read about RAID throughout the years and understand it theoretically as a way to help e.g. server PCs reduce the chance of data loss, but now I am buying a new PC which I want to ...
1
vote
1answer
764 views

Can you explain these PassMark Disk Scores on my RAID1 vs RAID10 volumes?

I need some help in interpretting the following speed tests on two Volumes on my home PC. The test: CrystalDiskMark 2.2 Windows 7 Disk Cache was disabled Both volumes were 0% fragmented before the ...
5
votes
3answers
1k views

Recommendations for hard drive performance boost

I'm going to be building a new system soon and I'm willing to spend a few more dollars to improve my hard drive performance. This will be a general use system so I just want to see HD intensive tasks ...