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.

learn more… | top users | synonyms

62
votes
8answers
6k views

How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved ...
19
votes
3answers
7k views

Linux - real-world hardware RAID controller tuning (scsi and cciss)

Most of the Linux systems I manage feature hardware RAID controllers (mostly HP Smart Array). They're all running RHEL or CentOS. I'm looking for real-world tunables to help optimize performance for ...
2
votes
2answers
3k views

Non-volatile cache RAID controllers: what kind of protection is there against NVCACHE failure?

The battery back-up (BBU) model: admin enables write-back cache with BBU writes are cached to the RAID controller's RAM (major performance benefit) the battery saves uncommitted and cached data in ...
9
votes
5answers
1k views

ZFS best practices with hardware RAID

If one happens to have some server-grade hardware at ones disposal, is it ever advisable to run ZFS on top of a hardware-based RAID1 or some such? Should one turn off the hardware-based RAID, and run ...
3
votes
3answers
5k views

What are the good ways to migrate a RAID array to bigger disks?

I'm looking to replace my hard-drives with bigger-ones and I would like to know what are the best practices in doing this. I have a HP ProLiant with its 256MB version of RAID controller: 03:00.0 RAID ...
16
votes
3answers
3k views

How effective is LSI CacheCade SSD storage tiering?

LSI offers their CacheCade storage tiering technology, which allows SSD devices to be used as read and write caches to augment traditional RAID arrays. Other vendors have adopted similar ...
7
votes
1answer
387 views

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 ...
3
votes
2answers
2k views

Monitor LSI 3ware raid controller on ESXi

This concerns a server that runs ESXi (v. 4.x or 5.x) installed on drives that are configured into a raid10 using an LSI 3ware 97050 raid controller. I would like to know if there is a way to monitor ...
0
votes
1answer
191 views

Move raided hard drives between identical servers, preserving data

I have a raid array of hard drives in a Sun x4600 that need to be moved out, and another Sun x4600 ready to accept those hard drives. The problem is: in my limited experience with servers, it seems ...
12
votes
11answers
2k views

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 ...
8
votes
5answers
4k views

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 ...
9
votes
7answers
25k views

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 ...
16
votes
7answers
4k views

RAID-5: Two disks failed simultaneously?

We have a Dell PowerEdge T410 server running CentOS, with a RAID-5 array containing 5 Seagate Barracuda 3 TB SATA disks. Yesterday the system crashed (I don't know how exactly and I don't have any ...
5
votes
3answers
1k views

Four disks - RAID 10 or two mirrored pairs?

I have this discussion with developers quite often. The context is an application running in Linux that has a medium amount of disk I/O. The servers are HP ProLiant DL3x0 G6 with four disks of equal ...
3
votes
1answer
219 views

Set device offset in Linux due to failed hardware RAID?

I have a failed hardware RAID card. This card had two drives in a RAID-1 mirror. Plugging one of the drives into the motherboard shows no partition table. Using a program like testdisk, I can see ...
6
votes
4answers
10k views

Monitoring hardware RAID on VMWare ESXi

I've got an ESXi 3.5 server on "unsupported" hardware - SuperMicro motherboard, Adaptec 9410 3405 RAID controller (oops, the 9410 is the onboard controller that's not being used for RAID) - and I'm ...
3
votes
2answers
368 views

How to determine HP Smart Array model?

How to determine HP Smart Array model on HP server? I own HP 350 G6 server. Really do not know where to look, is there a utility tool that can help me find this information, or is there a sign on the ...
3
votes
1answer
551 views

moving raid 10 to another identical server both on Smart Array 6i controllers

I have dead HP DL 380G4 with RAID 1+0 with 1 logical volume from 4x72GB drives on built-in Smart Array 6i 128Mb BBWC. It was shut down properly. It seems it was usual death for Proliant with ILO led ...
2
votes
3answers
8k views

What's the right RAID Controller for my Dell Server?

I don't quite understand the significance of differences between the various Dell RAID controllers for my scenario, it would be great if you guys could help me choosing the right one. I don't want to ...
5
votes
2answers
1k views

LSI 9260-8i w/ 6 256gb SSDs - RAID 5, 6, 10, or bad idea overall?

We're provisioning a new production server for our reasonably busy website. Our choice of host have available a 6 drive configuration with a LSI 9260-8i card. My initial thought was to fill all six ...
2
votes
2answers
255 views

What cable do I require for SFF-8087 to SAS

I have a HP P410 and two 2.5" SAS Drives, i want to connect both those SAS drives to one port. I know the cable for the P410 is a SFF-8087 and ive seen plenty of adapters searching, but alot of them ...
2
votes
1answer
459 views

Online resize logicaldrive on Smart Array P410i

On my HP Proliant server I have hot added 2 extra drives. To expand the current raid 1 array I used the following commands: hpacucli ctrl slot=0 logicaldrive 1 modify raid=1+0 hpacucli ctrl slot=0 ld ...
2
votes
2answers
2k views

Perc 5/i and 3TB drives?

Any way to get a Dell Perc 5/i controller to recognize 3TB drives?
1
vote
1answer
606 views

How to get HDD parameters from SCSI controller

The SCSI controller we are using is IBM RAID M1015 and a SATA 3 HDD is attached to it. Now the question, is there any way to get the HDD specific parameters like HDD Model number/Manufacturer, Storage ...
0
votes
0answers
68 views

Why parsing directories are so slow?

I have a directory with 136 000 files for a total of 1.8GB. The server has: 8 Cores - Intel(R) Xeon(R) CPU E5606 @ 2.13GHz 25GB RAM Ubuntu 12.04.2 LTS Hardware RAID 1 (LSI Logic / Symbios Logic ...
0
votes
1answer
855 views

How to live migrate Raid 6 to Raid 10 - and add hard drives in the process - using MegaCli

I have a new server, that has 6 SATA HDs with 1TB each. I am using a Hardware Raid 01:00.0 RAID bus controller: LSI Logic / Symbios Logic LSI MegaSAS 9260 (rev 03) The server came preconfigured ...
0
votes
3answers
743 views

Show hard drive setup in linux

I am trying to determine this remote server's hard drive setup including RAID. A developer who was here before me had set it up and I'm trying to determine the procedure for getting things back ...
-4
votes
1answer
81 views

raid 1 always degraded after pushing reset [closed]

I have Marvell hardware raid 1. After pushing reset or any other incorrect shutdown raid is degraded. Is it possible to create hardware raid 1 on other chips(intel chipset for example) for example ...