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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.

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Does a raid controller use cache in JBOD mode?

I'm specifically asking about a P420 in a D380p G8 server. I'm planning on using storage spaces direct requiring a simple HBA. So I've disabled RAID on the P420's. I'm curious if in this JBOD mode the cache on the raid card is even used?
techpad
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Samsung 840 Pro SSDs in a Dell R720

We have a MySQL database server running on an Dell PowerEdge R720 (PERC H710 Mini RAID controller) ( (Ubuntu 12.04). We're considering upgrading the 2 x 146GB 15k SAS drives to Samsung 840 Pro SSDs. The Dell ones are just far too expensive! (nearly…
BT643
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Software vs. Hardware RAID1 (Mirror)

How does the Software Mirror in Windows Server systems compare to an affordable hardware/BIOS RAID? I've had some rather bad experiences with onboard hardware RAID controllers, so I would want to avoid them in the future. OTOH I've used XP's and…
peterchen
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HP ProLiant ML350 G6: Does the RAID rebuild automatically?

A SAS HDD in our ML350 is faulty. We're buying a new one and I wanted to ask if I can just take out the faulty one and insert the new one with the server on to let it rebuild the raid or any manual operation is required.
Pitto
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Are different RAID cards setups compatible?

I'm setting up a new NAS/SAN system with RAID5, and I was wondering if going the software or hardware RAID way because I had this question in mind: If my hardware-RAID card fails, will I need to substitute by one exactly the same, same brand is…
Andor
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RAID array Considerations - Any advice?

We just bought a Dell PowerEdge r510 (12 drive bays) that will fill the role of an archive server. We have 6 drives (1TB each) installed. The plan is to have all the drives in a single RAID array and carve out an OS partition and an Archive…
I.T. Support
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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…
Tall Jeff
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RAID60 w. LSI 9361-8i: Consistency Check repetitively finds inconsistent parity

I'm maintaining a pre-configured storage system for a project team. The storage consists of 36 x 8 TB HGST Disks (~240 TB net) in RAID60 (2x18 disks in RAID6), Controller is a MegaRAID SAS 9361-8i, OS=Scientific Linux 7.2 storcli64 /c0 /v1…
alphabricks
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How to recover from "Invalid Drive Movement" (HP SmartArray P411)

Due to hurricane Matthew, our company shutdown all servers for two days. One of the servers was an ESXi host with an attached HP StorageWorks MSA60. When we powered things back up today and logged into the vSphere client, we noticed that none of…
John 'Shuey' Schuepbach
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How do you connect more than 4 drives to a LSI 9361-4i MegaRAID controller?

I’m fairly new to proper hardware RAID having only used it in pre-built server machines before, but on the recommendation of some friends who work for datacentres I’ve bought an LSI 9361-4i MegaRAID controller to install into my main storage box at…
Benjamin Nolan
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LSI RAID controller errors on DB import - How to troubleshoot?

We're running an import of a database dump on an Oracle system - (RHEL 5.9, 2.6.18-348.6.1.el5). The import does not complete, eventually erroring-out with: ORA-15080: synchronous I/O operation to a disk failed WARNING: failed to write mirror side 1…
ewwhite
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How long should rebuilding 250GB take?

In a PowerEdge 1900 have I a hardware RAID 5 of 5x250GB disks + 1 hot spare 250GB. Disk 2 have errors, so I forced it offline in the raid bios to replace it. Now it have been rebuilding to the hot spare for 4 hours, and it is not finished yet. That…
Sandra
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Poor read performance on Dell Perc H200 RAID10 with (4) 1TB 7200rpm 64MB drives

I am seeing only 50MB/s reads: ensnare@box:~$ sudo hdparm -tT /dev/sda [sudo] password for ensnare: /dev/sda: Timing cached reads: 4592 MB in 2.00 seconds = 2296.48 MB/sec Timing buffered disk reads: 192 MB in 3.90 seconds = 49.24…
ensnare
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Can enabling a RAID controller's writeback cache harm overall performance?

I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed…
Nathan O'Sullivan
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Recommendations for hardware RAID controllers

I'm looking for a hardware RAID controller. I want something that: Can support 8 or maybe 16 hard drives Won't randomly break, lose my data, etc. Does anyone have recommendations? It seems like people have reliability issues with RAID…
Sam Lee
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