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30
votes
6answers
22k views

Software vs hardware RAID performance and cache usage

I've been reading a lot on RAID controllers/setups and one thing that comes up a lot is how hardware controllers without cache offer the same performance as software RAID. Is this really the case? I ...
19
votes
3answers
8k 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 ...
6
votes
5answers
4k views

RAID level confusion (MegaCli vs megasasctl output)

I'm utterly new to working with LSI MegaRAID controllers and I'm confused as to what RAID level I am actually running. My server is equipped with 4 disks, 4TB each and I would like to have them ...
1
vote
3answers
1k views

Why is the 9650SE RAID1 not showing the full size of the disks?

This is a follow-on to How can I grow a 3Ware 9650SE RAID1 under ESXi 5.0? I've successively replaced 1TB drives in my RAID1 with 2TB drives hoping that I can grow the datastore I've got in ESXi 5.0. ...
1
vote
2answers
11k views

LSI RAID monitor reports “Consistency Check inconsistency logging disabled”

I have a server with a LSI MegaRAID 9261-8i controller. Recently I started getting alerts like this one: Controller ID: 1 Consistency Check inconsistency logging disabled, too many ...
0
votes
2answers
2k views

Is it possible to run LSI SAS 9211-8i PCI-E 8 in PCI-E 16 Slot?

I just bought an LSI SAS 9211-8i HBA(Host bus adapter) to use with my new hardware. I realized after looking at the card that it required an x8 slot and my new mobo only x16 available. I keep on ...
4
votes
1answer
10k views

What's a “battery relearn” on a LSI MegaRaid?

Our file server just started mailing us about how its battery backup is draining and it's switching from WB to WT mode and so on. I looked through its logs and found that it is configured to ...
2
votes
1answer
8k views

Splitting a raidctl mirror safely

I have a Sun T5220 server with the onboard LSI card and two disks that were in a RAID 1 mirror. The data is not important right now but we had a failed disk and are trying to understand how to do ...
1
vote
2answers
12k views

LSI Storage Manger for Windows PERC H700 Controller

I have a PERC H700 controller from Dell which appears to be a re-badged LSI 9260-16i raid card. I looked in the download link from LSI, but it only has the MegaRaid Storage Manager for Linux. MegaCLI ...
6
votes
2answers
2k 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 ...
3
votes
3answers
2k views

How to understand the LSI HBA connector specs?

When reading the specifications for the LSi SAS 9206-16e HBA, it says Storage Connectivity; Data Transfer Rates * 16 ports; 6Gb/s SAS 2.1 compliant SAS Bandwidth * Half Duplex 2400MB/s, x4, ...
3
votes
1answer
1k views

Monitor LSI MPT disk status

I have some servers with RAID arrays based on LSI Logic MPT chips (specifically the SAS1068E). Currently the only way I'm aware of to get the disk status is to use the lsiutil program and view the ...
2
votes
2answers
2k views

Dell Perc 6/i Raid Monitoring on Linux 2.6.32-2x kernels

I am running an LSI raid (Dell Perc 6/i) on my Ubuntu 10.04 server. I want to monitor the raid array but it seems that there is no software for it. The raid drivers are part of the kernel, but I dont ...
1
vote
2answers
852 views

How does LSI MegaRAID actually lay out RAID10 sets?

I'm trying to set up a RAID10 set on an LSI MegaRAID controller. It is unclear to me how the RAID controller will actually lay out the RAID set on the physical drives. Part of the problem is that ...
1
vote
5answers
3k views

MegaCLI always returns blank output

This server is a Dell R200 running Ubuntu 8.04LTS using a LSI SAS1068E raid card supplied from Dell, I suspect that there might be some kind of RAID issue with the hardware raid built into the ...
0
votes
1answer
778 views

How can I grow a 3Ware 9650SE RAID1 under ESXi 5.0?

Thanks to this question I've now got my ESXi 5.0.0 (Build 623860) running/booting off a physically enlarged 9650SE controlled RAID1 array. The 1TB drives had been replaced with 2TBs; I'd like to ...