Hi, I'm requesting for your help
I'm trying to instal CentOS on a Dell R520 Raid 5, It doesnt work, when I try to install I received an error Unable to allocate partions, so I try to delete the virtual disk and work without raid, but I cant configure the server to do that.
Anyone hace idea on how to do that?
Regards,
Hi,
Seen the performance issues described in http://en.community.dell.com/support-forums/servers/f/906/p/19587459/20643636.aspx you might want to "downgrade" from a Dual SPERC8 to a Single SPERC8. Although there is a manual available to "upgrade" from a Single SPERC8 to a Dual SPERC8, there is no manual of going back to a Single SPERC8 configuration. Hence this post!
Step by step:
After this is done, you can change the write caching policy on your VD's from "Write Through" to "Write Back". You will have a huge performance gain!
We've got 12 VRTX's and it is funny that we didn't have to do the CMC downgrade on some of them and also the PERC firmware down/upgrade was not needed on all of them.
If anyone has a quicker/cleaner/better way of "downgrading" to a Single SPERC8 configuration, please let me know!
Note: resetting the PERC controller configuration via CMC or via racadm did not do the trick, I had to downgrade to an earlier CMC version first.
Regards,
Erik
My main question here is this: what tools can I use to determine what is going on inside the H710P? For example, if I knew how busy its processor and cache are I could avoid some of the guesswork I'm doing.
The details: I built a nice Linux NFS server (using CentOS 6.4) with a 720xd, H710P raid controller, and for now I have 5 Micron P300 SSD's in a RAID 0 set. Unfortunately, the write speeds never get above about 250MB/sec even with a dozen NFS clients writing to it over 20Gb Infiniband (sadly, even with 1 gigabit they seem to be able to easily hit the limit).
I realize that there a lot of layers here, but I have a pretty good understanding of the Linux side. However, the H710P is a black box to me -- are there any tools to help get a better insight as to whether or not the controller is at its peak performance? I have done a ton of benchmarking, but the most interesting test results are with iostat and soft irq's. Here is what "iostat -xk 1" has to say about it:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
sdc 0.00 51804.00 92.00 3748.00 2808.00 221544.00 116.85 4.45 1.16 0.23 87.20
Sorry if the fonts above are showing up proportional even though I set them to monospaced! The important columns are: wrqm/s 51804, wkB/s 221544, util 87.20%
This is about as fast as it can go. It is interesting that top shows a ton of Soft IRQ's (%si) -- it routinely gets above 75% but all on the first CPU core.
Also interesting - before I started NFS I did a raw write test to the device with 4 disks in RAID 0, and it was getting about what I would expect: 1.3GB/sec (individual disks top out at about 350MB/sec). However, when I re-created the raid with 5 disks, the raw write speed slowed down to 1.1GB/sec when I was expecting > 1.6GB/sec. What can cause this kind of slowdown? Does the H710P hate odd numbers of disks, or do I possibly have a flaky SSD, or "other"?
Thanks!
I was looking through the available upgrades for the R415 to find a scsi adapter card. I don't see one listed but was hoping someone could point me to a compatible card. We have to connect to scsi tape drives.
Hi,
anyone can guide me to check on the configuration setting on controller ?
thanks
Hi.
I have one PowerEdge 2900 server with eight 750GB SATAu, but this space has almost exhausted.
So I want to upgrade these 750GB SATA*8 drives to 3TB*8 drives, but technical specification of PowerEdge 2900 says
it only supports up to 750GB SATA drive.
Someone know that can I change those 750GB SATA drives in SATAu tray to 3TB SATA drives?
Thank you in advance.
My T110 has been running a single 500 GB drive since the beginning of its time. The drive is getting pretty full and I'm wanting to replace it with a 2 TB drive and copy everything over via partition master. At the same time I would also like to RAID 2x 2TB drives in a RAID 1 for redundancy. Would it be possible to turn this (OS) drive into a RAID 1 and keep the drive intact?
I'm trying to replace the perc 6/i card in my Dell 2900 with a H700. All firmware have been upgraded to the latest levels on the server and the H700. Because the H700 has different connections, I had to buy two http://www.tripplite.com/sku/S510-003 cables to connect the H700 to the backplane. Everything connects correctly and I can see the two virtual drives that originally existed on the perc6/i , but when I boot, I get a "SAS cable is missing or misconfigured" message during the post. I have ESX 5.5.x installed and it boots to the point of loading the kernel and then just hangs completely which I believe is due to the SAS cable error. I'm just not sure where to go from here. Everything works great when the perc 6/i is installed but I am looking at using 4tb drives which the perc 6/i card does not support. I even looked at cross flashing the perc 6/i card to a SAS 1078 card which flashes but the ctrl-R won't work afterwards persumably because the SBR on the perc 6/i is still from the perc card and not from the SAS 1078 card which I couldn't find (SBR for SAS 1078 that is). I know that is a lot of information but I've been at this for weeks now and I haven't made any progress. The reason I am keeping the 2900 is because it is one of the few Dell servers that has 8 3.5" drive slots. The same server also has a Dell H800 which is cabled to a MD1000 with 4tb drives in it and it is working fine.
Hi,
I have a problem on my PowerEdge T300.
In the dell openmanage server admin I have the following warning:
Virtual disk degraded: Virtual Disk 0 (Virtual Disk 0) Controller 0 (PERC 6/i Adapter).
When I go to physical disks all seems to be fine.
Does anyone have a clue what this can be?
Best regards
I have inherited a T710 (i believe, case is in horrid shape) and it has Server 08R2 Preinstalled.
When booting up i get an error: Memory/Battery problems were detected. The adapter has recovered but cached data was lost.
When I load windows and go into OPENMANAGE Server Admin I see TONS of these errors (see below). I guess my questions are, What are these issues? How can I fix it?
PERC 6/i Integrated - Firmware 6.2.0-0013 and shows theres a newer firmware version. Should I update? How do I? and will it fix my issue?
I recently purchased a scsi controller 5/iR, I have a problem when I try to configure the RAID, I can not get into the bios on the controller, I press CTRL + C as indicated by the manual, but I can not access. I've tried multiple keyboards to work correctly, but I can not access the bios
Hello,
I have Dell T110 with S100, configured as below:
Raid 5 (disk 0:0, 0:1, 0:2) + Hot Spare (0:3).
the first tow disks are (Dell original 500 G.B 7.2k), and the rest are WD 500 G.B 64MB, Green!.
actually, after i add these tow WD disks, later i found that the rpm of this disks not 7.2k, it's intellipower as WD mention on their website.
In the performance, it's a little bit slow i can see.
Q1: is it no problem to keep this setup as it's? or i should again replace the WD with 7.2k to match the exist Dell Disks.
Q2: if i change the last disk in Raid 5 with (1T.B) 7.2k will solve the weakness? i don't know what will happened with raid 5 with (500 G.B x2 + 1T.B)
Q3: how i can replace that disk without losing any data?
thanks for reading.
Hi, our company has purchased a Dell PowerEdge R720. I tried to use the Lifecycle Controller in configuring the RAID. Initially it has 3 HDD all 500GB SAS but I ordered an additional 2x 320GB SAS because what I intend to do is, use the 2x 320GB as OS setup as RAID 1, and RAID 5 on the default 3x 500GB, but for some reason, whenever I setup RAID, either on both 320GB or the 3x 500GB, it just shows one virtual disk, either the 2x 320GB or the 3x 500GB, i cant see both virtual disks for RAID 1 and RAID 5. Am I missing something here? or do I need to perform an additional step?
Regards,
Jeff
Dear Sir,
While I already configured RAID 5 with 5 disks, then on the step of installation OS (Window 2008 R2) I saw 2 separate partitions. and I can install on the partition that have 2TB only. Another one cannot. Thus while my OS installation completed, then I can use only 2TB, for another volume about 5TB is cannot do anything. Can I do RAID 5 with 5 disks (10TB)?
I am awaiting your helpful for my posed.
Thanks.
Hi All,
I have just started a new Job, and it turns out they use Dell Hardware and have a failed disk. I have always worked with other vendors, so I would like to know if the image is correct.
I could be reading it wrong, but that looks like RAID is not configured and there is only a single disk? Maybe I'm getting confused?
Any help would be great.
Thanks
Hi everyone, can anyone tell me where I can find or possibly what I need to look at my RAID config and possibly see if the hard drives I have on my server are going bad. The server in questions is a PowerEdge 2950 Service Tag: <ADMIN NOTE: Service tag removed per privacy policy> and is in a remote location. I have been tasked with finding out about this server and what maintenance needs to be done on it since no one has been doing it. There is an amber light flashing on one of the 73GB drives but there is no Dell software installed on this server so I believe I need the modular storage software and possibly something else. Windows Server 2003 R2 SP2 x64 I believe it is in a RAID 5 config but I am not 100% on that Any help or guidance would be appreciated. Ray D
Hi all,
I have a 2950 that I am installing 14.02 unbuntu on and it has 5 drives. (2) drive are 146GB and the (3) drives are 2TB. I went in the BIOS and I didn't see the drives listed. Ubuntu was installing on the 146GB drives that are mirroring.
Drives are in the following slot:
146GB: Slot 0 single green light on top
146GB: Slot 1 single green light on top
2 TB: Slot 2 single green light on top
2 TB: Slot 3 dual green lights
3 TB: Slot 4 dual green lights
empty: slot 5
Anyone know as to why I can't see the 2TB drives or know any troubleshooting ideas?
Thanks in advance!
