0
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0answers
20 views

Linux MD software raid stripe cache size

From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory. By increasing this value you can get a ...
0
votes
1answer
509 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 ...
1
vote
1answer
276 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
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0answers
248 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
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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 ...
0
votes
1answer
218 views

Ubuntu - inconsistent performance with software raid-1

I'm installing a new system using soft-raid 1 with two physical disks. While running a few tests (after waiting for the initial sync to complete) I found the harddrive speed was highly inconsistent. ...
2
votes
1answer
387 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 ...
1
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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 ...
1
vote
2answers
785 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 ...
0
votes
1answer
49 views

What is the tolerated performance difference between HDDs?

I got a server with software RAID1 and two identical HDDs. Using hdparm -tT I get sligthly different results, one gives me 100Mb/s and the other one 97Mb/s. Is this difference tolerable in this ...
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 ...
1
vote
1answer
771 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 ...