#hardware-raid

[sevennet-blog]

Answer: Do raid controllers syncronize HDD platter rotation? #computers #development #solution

Answer: Do raid controllers syncronize HDD platter rotation? #computers #development #solution

Do raid controllers syncronize HDD platter rotation?

I’m in the market for a new storage solution. While researching various specs one of my coworkers said that some raid controllers can synchronize HDD rotation to the effect of all drives’ sector/block 0 passes under the reading head at the same time.

I searched online but have not been able to find information proving/disproving this claim.

Ans…

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[sevennet-blog]

Fix: Poweredge RAID Monitoring and Debian #computers #fix #development

Fix: Poweredge RAID Monitoring and Debian #computers #fix #development

Poweredge RAID Monitoring and Debian

What tools do you use to monitor hardware RAID Status on Dell Poweredge 2950 (II and III, perc)? I run Debian. I’ve used a “debianized” version of dell openmanage in the past. I’m looking for a lightweight solution and (if possible) something “debian packaged”.

Any ideas are welcome!

Thanks

Answer [by dyasny]: Poweredge RAID Monitoring and Debian

OMSA works…

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[sevennet-blog]

How to: I have a 21TB array but only 16TB is visible from Windows #computers #it #solution

How to: I have a 21TB array but only 16TB is visible from Windows #computers #it #solution

I have a 21TB array but only 16TB is visible from Windows

CONTROLLER

Raid Controller: 3Ware 9650SE-24M8

Disks: 21 x 1TB RAID5

Stripe 64KB

WINDOWS

OS: Windows Server 2003 SP2 32x

Disk: Dynamic 19557.44GB

Volume: Capacity 15832.19GB

I guess my array must have a 4KB block size which is limiting it to 16TB. I think I would have to switch to a 64KB block size to be able to see a maximum of 256TB. Or…

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[sevennet-blog]

Solution: Why are "sectors per track" still relevant on a modern OS with modern drives? #development #it #fix

Solution: Why are "sectors per track" still relevant on a modern OS with modern drives? #development #it #fix

Why are "sectors per track" still relevant on a modern OS with modern drives?

I am building out a new machine and the raid controller is asking me for sectors per track. I haven’t had to deal with disk math in a long time (1998?), and I can’t find anything that pertains to modern hardware. These are 2TB SAS drives running a 2.8 kernel on a p420i controller.

What is the difference between the…

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[sevennet-blog]

Answer: Is RAID5 more robust than RAID1 #solution #it #development

Answer: Is RAID5 more robust than RAID1 #solution #it #development

Is RAID5 more robust than RAID1

I am about to replace an old hardware RAID5 array with a Linux software RAID1 array. I was talking to a friend and he claimed that RAID5 was more robust than RAID1.

His claim was that with RAID5, on read the parity data was read to make sure that all the drives were returning the correct data. He further claimed that on RAID1 errors occurring on a drive will go…

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[sevennet-blog]

Fixed: Managing battery relearn cycles on LSI and similar RAID controllers #programming #it #fix

Fixed: Managing battery relearn cycles on LSI and similar RAID controllers #programming #it #fix

Managing battery relearn cycles on LSI and similar RAID controllers

How do engineers deal with RAID controller battery “relearn” cycles?

As noted in: What’s a "battery relearn" on a LSI MegaRaid?, relearn cycle discharges the RAID controller battery (BBWC or BBU), thus removing the write cache acceleration. The battery’s life is checked and once charged, the write cache is reenabled. This has an…

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[sevennet-blog]

How to: How to select the best Stripe Size when configuring a RAID Array #it #programming #solution

How to: How to select the best Stripe Size when configuring a RAID Array #it #programming #solution

How to select the best Stripe Size when configuring a RAID Array

There are various “references” on the Internet that delve into some discussion about what factors to consider when selecting a particular RAID stripe size (4KB to 128KB or more) for an array of disks, but none of these come across as very authoritative nor consistent with each other really.

For example:

John’s Tech Bits Stripe Width…

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[stackcopybiz]

Fixed: Onboard RAID vs Software RAID #computers #dev #fix

Fixed: Onboard RAID vs Software RAID #computers #dev #fix

Onboard RAID vs Software RAID

My motherboard, an Asus M4a79t Deluxe, advertises RAID 0/1/5 capabilities. My limited understanding is that onboard RAID is better than software RAID. Is this necessarily true? Is an onboard RAID controller closer in performance to a software controller or a dedicated hardware controller?

Answer [by Evan M.]: Onboard RAID vs Software RAID

Depends on the RAID type.…

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