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Questions tagged [hardware-raid]

RAID solution with hardware assistance. RAID parity calculations can be performed by either the main CPU, or by a separate processor on the RAID controller card.

674 questions
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5 answers

How to check if hardware RAID is configured?

I have several servers running Windows 2008 and Red Hat 5 that are capable of hardware RAID. How do I check that hardware RAID is configured?
lillq
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Hardware RAID controller cache battery failure frequency/lifetime?

I'm in an environment that contains many Supermicro servers equipped with Adaptec and LSI MegaRAID hardware RAID controllers. These controllers contain battery-backed cache modules to help boost write performance and protect data in-transit. A…
ewwhite
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Why do I need a raid battery pack?

I'm trying to understand why one would add a batterypack to a raid card. It seems to me like if power goes down, running just the raid card is going to do little good: without power for HDs and motherboard, writing in-memory data isn't going to work…
user60704
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7 answers

What is a (raid-controller-) BBU for?

I am wondering what's the purpose of a BBU. My first understanding was, that it enables the cache to write the data to the disc during a power failure. But some specifications say that a BBU can hold its data for up to 72h. I'd expect the data to be…
tanascius
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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…
ewwhite
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3 answers

Can't enter HP SmartArray P410 RAID ORCA set-up on HP ProLiant DL320G6

I've just installed an HP SmartArray P410 controller into my HP ProLiant DL320G6 server. The controller seems detected by the server BIOS (it shows up in controllers list in the BIOS set-up), hard drives LEDs flash, but the controller is never…
Ivan
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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…
andynormancx
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HP ACU CLI Examples

Has anyone used the HP Array Configuration Utility Command Line Interface (hpacucli.exe) to get physical disk information into a file? I'm not at the machine right now, but basically I want to find out what the state of each of the physical disks in…
FrinkTheBrave
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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…
Ben
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4 answers

Do disks in Raid-1 function outside of the raid?

Raid-1 is mirroring two disks (if I haven't messed up completely here :p). Does that mean that I could take one disk out and put it into another machine and it would work like a normal disk? Or does it still only work in the raid? I can understand…
Svish
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Is Ceph possible to handle hardware RAID arrays (LUNs) as OSD drives?

I am pretty new to Ceph and try to find out if Ceph supports hardware level raid HBAs. Sadly could not find any information. What I found is, that it is recommended to use plain disks for OSD. But this pushes the requirements to the PCIe, the…
cilap
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4 answers

ZFS stripe on top of hardware RAID 6. What could possibly go wrong?

I have 36*4TB HDD SAN Rack. RAID controller did not support RAID60 and not more than 16 HDDs in one RAID group. So I decided to make 2 RAID6 groups of 16HDD or 4 of 8 HDDs. I want to get all storage as one partition. So, what could possibly go wrong…
Severgun
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What is the best way to RAID external drives?

I love the fact that you can now buy 1 and 2 TB drives cheap. However that much data on a single drive scares me. What would be the best way to build a raid system out of external drives? I am looking for advice on performance, price, and ease of…
Tony Borf
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4 answers

Is this a critical RAID error?

If I do the following /opt/MegaRAID/MegaCli/MegaCli -LDInfo -Lall -aAll -NoLog > /tmp/tmp /opt/MegaRAID/MegaCli/MegaCli -LDPDInfo -aAll -NoLog >> /tmp/tmp then I see these errors Media Error Count: 11 Other Error Count: 5 Question What does…
Sandra
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How long should a RAID Reconfiguration take? (Adaptec 6805)

I'm experimenting with various RAID configurations of a new Adaptec 6805 (not the 'E' model) Attached are 8x Hitachi 5400RPM 2TB SATA 6Gb Drives using the miniSAS to SATA cables provided. I created a RAID6 array comprising four disks, two from…
user65539
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