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10
votes
2answers
2k views

Why is my RAID1 read access slower than write access?

I have done some simple performance tests and it seems that reading from my RAID1 is slower than writing: root@dss0:~# for i in 1 2 3; do dd if=/dev/zero of=/dev/sda bs=1048576 count=131072; done ...
8
votes
2answers
17k views

How can I get an email alert when RAID array is degraded? VMware ESXi 5.0, MegaRAID SAS 9260-4i

We have recently bought a "white box" server to run VMware ESXi 5.0 (we're planning to use the vSphere 5 Essentials Kit). According to VMware's Compatibility Guide, the server's LSI Logic MegaRAID SAS ...
7
votes
2answers
6k views

LSI 9285-8e and Supermicro SC837E26-RJBOD1 duplicate enclosure ID and slot numbers

I am working with 2 x Supermicro SC837E26-RJBOD1 chassis connected to a single LSI 9285-8e card in a Supermicro 1U host. There are 28 drives in each chassis for a total of 56 drives in 28 RAID1 ...
6
votes
7answers
13k views

MegaCli: Get the /dev/sd* device name for a logical drive

Let's say I know the drive I want is on Adapter 8, Virtual Drive 0, is there a way to get the Linux device name (e.g. /dev/sdt)? I am on RHEL 6.2. -pdlist displays a WWN value for each physical ...
5
votes
6answers
9k views

MegaRAID JBOD substitute

It seems that certain MegaRAID chips don't support JBOD (unfortunately). I've read online that to make these controllers act as a pass-through, I should configure the disks in RAID0. What RAID0 ...
5
votes
1answer
1k views

Reset MegaCLI error count

I have a system where MegaCli64 -PdList -a0 shows media errors on one disk. After investigating the errors, I've decided not to take any action for now. I'd like to reset the error count, so that ...
4
votes
3answers
11k views

Configuring RAID 10 using MegaRAID Storage Manager on an LSI 9260 RAID card

Using MegaRAID Storage Manager 13.04 on an LSI 9260 RAID card, which is the correct way to create RAID 10 using 8 drives with maximum redundancy? There appears to be multiple ways to reach the same ...
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 ...
4
votes
4answers
5k views

How to create Raid 10 with megacli

I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in ...
4
votes
2answers
800 views

megaraid: Logical Drives at different RAID levels

I am currently using a SuperMicro machine that has an on-board LSI 2208 controller (MegaRAID class). I want to create a single array from two drives and then carve that up into: one RAID1 100GB ...
4
votes
4answers
5k views

LSI MegaRaid - get HDD temperature

Is there any way to get a drive temperature using MegaCLI or any other utility? Like "tw_cli /cx/px show temperature" in 3ware. OS: Solaris x86.
4
votes
1answer
724 views

Partition alignment on MegaRAID RAID 1 with 4k sector (advanced format) drives

I want to setup RAID 1 (mirroring) on a LSI MegaRAID SAS 8708EM2 (1078 chipset) with 4k sector (advanced format) drives. To the best of my knowlegde the controller does not officially support 4k ...
4
votes
1answer
433 views

Measuring SSD wear out behind LSI MegaRAID controller?

I'm trying to find out how to measure the total bytes written (or a percentage of maximum expected, either is fine) for a few RAID arrays behind LSI controllers. The controllers are all LSI MegaRAID ...
4
votes
0answers
3k views

PERC MegaRAID S.M.A.R.T. Status is not matching smartctl's - looking for clues what's wrong with the HDD

I'm getting strange SMART error from MegaCli on Dell R720xd and PERC H710P with five 4Tb SATA drives in RAID5 /opt/MegaRAID/MegaCli/MegaCli64 -PDList -aALL gives me some "Failure Seq Event Number" ...
3
votes
4answers
8k views

LSI RAID: Write cache policy affects read performance?

I have a server with a LSI MegaRAID SAS 9260-4i controller, RAID-5 with 3 x 2 TB disks. I did some performance testing (with iozone3) and the numbers show clearly that the write cache policy affects ...
3
votes
1answer
529 views

Optimal RAID10 configuration for 8 disks and two volumes?

I have an Open-E file server with 8 SAS disks and a MegaRAID 9271-8i controller and I want to configure two logical RAID10 volumes of identical size. One volume has about 66% write access and 33% read ...
3
votes
1answer
762 views

Migrating RAID6 array from HP SmartArray P600 to LSI MegaRAID SAS 8888ELP

My customer has an external RAID6 array (8x 1TB in HP MSA60 enclosure) attached to HP SmartArray P600 controller. They have now decided to replace the server and the new one comes with LSI MegaRAID ...
3
votes
1answer
182 views

LSI RAID card commissioned hot spare

My company has an Open-E based file server (Celeros) that uses near-line SAS drives in RAID6 configuration managed by an LSI 9266-8i RAID card. We currently have one "dedicated hot spare" drive, no ...
3
votes
1answer
1k views

Megaware Raid 10

I have 22 disks and would like to create a Raid 10. Unfortunately my raid controller (MegaRAID SAS 9260-8i) is only capable to handle 8 arrays within a RAID 10. Because of that I could only use 16 ...
3
votes
1answer
748 views

Now to manage an LSI 9261-8i in vSphere 4.1, or a good alternative RAID card?

I've been struggling with a new VMware server we recently got. Everything installed fine, but I'm unable to manage the RAID card. The built-in monitoring works (kind of), but I need to manage it, not ...
2
votes
4answers
5k views

LSI MegaRAID Expected Chip Temperature?

We recently built a replicating SAN array from 2x Dell R720XD's, we are using LSI 9270-8i MegaRAID cards with CacheCade 2.0, BBU and Write Back cache enabled. Our cards are showing HUGE chip ...
2
votes
1answer
14k views

LSI MegaRaid warning: Patrol Read can't be started

We run a HyperV server on RAID-6 (the OS is Windows Server 2008 R2). The hardware is LSI MegaRaid SAS 8704EM2 controller, with 4x 1TB WesternDigital SATA drives. The server is up & running on this ...
2
votes
2answers
3k views

MegaRaid damaging disk by set a drive to “Offline”?

I wanted to test performance in a RAID10 with a "damaged drive". To simulate this situation I've set a single drive to "Offline" by using this command: MegaCli -PDOffline -PhysDrv [45:12] -aAll The ...
2
votes
2answers
2k views

LSI Megaraid alarm - clearing hotspare

I have several Supermicro servers with LSI Megaraid controllers, 9266-8i. One recently lost a drive; I replaced it as usual, but it is still beeping on reboot. It is set up as RAID 10 + hotspare. ...
2
votes
1answer
2k views

Consistency Check inconsistency logging disabled, too many inconsistencies on VD: 0 [duplicate]

We recently purchased an LSI MegaRAID 9266-8i SAS RAID card to replace a failed card in our NAS. Setup of the card went smoothly, I updated the firmware, set up RAID6 with hotswap, and let it ...
2
votes
1answer
2k views

Should I enable “Patrol Read” on SSD drives?

LSI, Intel and Dell RAID controllers (perhaps others) have a "Patrol Read" feature to try to spot when a drive is failing before it completely fails. LSI seems to disable patrol read on SSD by ...
2
votes
1answer
3k views

LSI MegaRAID : what does “transient error detected while communicating with PD : -:-:1” mean?

I've got a LSI MegaRAID 9260-16i card running in a server, and it keeps logging the error Controller ID: 0 Transient error detected while communicating with PD: -:-:1 I can't find anything about ...
2
votes
1answer
642 views

MegaCLI / MegaRAID Drive Groups

In the MegaRAID SAS Software User Guide it is stated that a Drive Group includes one or more virtual drives. An excerpt from the document is: "A virtual drive is a partition in a drive group that is ...
2
votes
1answer
761 views

SMART with Megaraid under windows

Is there a way to read RAW HDD SMART value that is behind a MegaRaid raid? apparently that is possible with smartmontools under linux, is there something similar possible with windows? Thanks.
1
vote
4answers
261 views

Erasing Server RAID Hard disks (SAS and SATA) for decomissioning

We are in a process of decomissioning a handfull of Fujitsu Primergy Servers. Before of course, we want to make sure that the hard disks are completely wiped out. But it seems there is no way to ...
1
vote
3answers
607 views

RAID10 Without BBU, With UPS

My datacenter says that each rack has primary and backup power on each rack. I assume this means there is a UPS for each server. Therefore, do I have any need of getting a BBU for the following setup? ...
1
vote
3answers
2k views

Why is my RAID1 or RAID10 virtual drive (6 SSDs) not significantly faster than a single SSD?

I'm trying to figure out why the performance of a Virtual drive built from 12 SSDs is not really faster than a single SSD drive. The Server is a IBM x3650 M4, two Xeon E5-2643v2 130W 6C 3,5GHz. The ...
1
vote
2answers
261 views

Horrible performing RAID

I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a ...
1
vote
1answer
2k views

Xenserver 6.5 LSI MegaRAID

Is there a package available to install the MegaCLI on XenServer6.5? For 6.5 there is this [1] but 6.5 has another kernel. XenServer 6.5 is based on CentOS6.5 (right?), so I also tried the ...
1
vote
1answer
1k views

Perc battery shown as missing

I replaced a failed battery in a Perc 5/i. The original and replacements are the same DLU8735 model. I couldn't find any special battery replacement procedures in the manual, so I just turned the ...
1
vote
1answer
8k views

Drive is failing but LSI MegaRAID controller does not detect it

smartmontools reports an increasing number of unreadable sectors on a drive that is used in a RAID1 configuration. I thought that the LSI MegaRAID controller also checks the SMART status of its disk ...
1
vote
1answer
2k views

MegaCLI Media Error Count

This morning, I just got a Nagios alarm because of: BRUBLUst01:/usr/local/bin# /opt/MegaRAID/MegaCli/MegaCli64 -PDList -a0 Adapter #0 Enclosure Device ID: 32 Slot Number: 0 Device Id: 0 Sequence ...
1
vote
2answers
319 views

LSI megaraid - config raid and non-raid

I have this configuration of server IBM X3650 M4 IBM ServeRAID M5110e 300GB x3 SAS (config as RAID 5) 1TB x1 SAS (config as normal disk, non-raid) Windows Server 2012 R2 Standard I would like the ...
1
vote
2answers
860 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
1answer
3k views

smartctl & megaraid: how to find the right device node for an adapter #

I can list physical drives on all megaraid adapters using: megacli -PDList -aALL This will display an adapter # for each adapter, and then list the physical drives attached to them. The ...
1
vote
2answers
997 views

LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

I'm trying to add a RAID10 SSD Cache to a VD by this command: [root@livecd storcli]# ./storcli64 /c0 add vd cachecade type=r10 drives=252:4,252:5,252:6,252:7 assignvds=0 Controller = 0 Status = ...
1
vote
2answers
2k views

Install MegaCli to Monitor Perc 5/i in Nexentastor 3

I have a Dell 2950 with a Perc 5/i Raid controller that we've already installed Nexentastor 3 Community Edition on. We setup a raid-10 array that and put a ZFS pool on top of the hardware. As I ...
1
vote
1answer
1k views

Use MegaCli to reconstruct RAID on Dell PERC 5/i?

I have a RAID 1 + hot spare that I would like to reconstruct, online, into a RAID 5 set. I know this is possible with OpenManage, but I has anyone figured out how to pull this off using the MegaCli ...
1
vote
0answers
14 views

MegaRAID Rebuild required after PdOffline + PdOnline?

In a RAID6 array with 12 disks I have taken a disk offline to flash new firmware, then brought it online again: MegaCli64 -PdOffline -PhysDrv[8:0] -a0 MegaCli64 -PdFwDownload -PhysDrv[8:0] -f ...
1
vote
0answers
53 views

Finding the serial number of hard disk drives on a SuperMicro server running MegaRAID SAS 8708ELP

As the title says, I have under my care a SuperMicro server running a hardware RAID 6 with a MegaRAID SAS 8708ELP on Linux. I have two failed disks that I have identified as the drives in slot 2 and ...
1
vote
1answer
39 views

Cannot mount partitions from LSI Software MegaRAID

I have a ThinkServer RD440 running RHEL 7.2 with a LSI MegaRAID which is configured as a RAID 10 over 4 disks. It is configured on a partition level, not the raw disks. The root partition is not part ...
1
vote
0answers
36 views

VMWare ESXi 5.x - Megaraid controller and SMIS - correct way to monitor/manage controller?

I found some information online: How to Enable RAID Monitoring and Configuration under ESXi 5.x as well as here on ServerFault here: How can I get an email alert when RAID array is degraded? VMware ...
1
vote
0answers
94 views

settings on a PERC H310 crossflashed to 9211-8i/IR

I'm using MegaRAID Storage Manager on Windows Server 2012 R2 and am trying to change some settings on the card. Sadly, the settings are missing entirely from the menu when I right-click on the ...
1
vote
0answers
382 views

Slow IO Performance with PERC H700/710 with current linux distributions

we noticed really bad write performance, on our new Dell R720 with Perc 710. Especially when it come to writing a lot of small files. The funny thing is that this bad performance only occurs on newer ...
1
vote
1answer
281 views

Disk errors Event ID 51 on LSI MegaRAID 9240-8i in RAID 1

I am working on a case of recurrent disk errors. Server is running Windows Server 2012 R2 Standard. There are two main disks on a mirrored RAID. There is also an additional drive that is used for ...