I've expanded a RAID 5 volume on a PERC controller in a Dell PowerEdge 2850. If your external enclosure supports hot swapping you can do this with the system up and running. Otherwise install the new hard drive and start up the server. Once the drive is installed open the OpenManage Server Administrator. Expand the Storage and PERC controller sections on the left pane and click Virtual Disks. Select the reconfigure task from the list for the RAID 5 virtual disk. The wizard will walk you through specifying the additional drive to be part of the RAID 5 array. Depending on the number of drives and speeds this process can take from a few hours to tens of hours. I recommend doing this while the system is not being utilized after hours. With the system idle you can speed up the rebuild rate, which should help it complete faster. Click on the PERC controller in the left pane and select Information/Configuration on the top bar. The controller tasks list should give you the option to set the rebuild rate. Just remember to set it back down when done. After it completes you still need to expand the underlying file system or create a new partition and file system on the additional space. If you need assistance with this please provide the partition layout on the RAID 5 volume and the file system being used. Ryan On Tue, Sep 1, 2009 at 5:14 PM, Anil Raj<anil.calvin@xxxxxxxxx> wrote: > Hi David, > Thank you very much for you detailed and patient response. > > My RAID controller is PERC 5/E and the external Dell drives are setup > up in RAID5. (I installed Dell's OpenManage Server Administration > which gave me the details of my existing RAID). Here's some output > (that might be useful): > > $ cat /proc/scsi/scsi > Attached devices: > Host: scsi0 Channel: 00 Id: 00 Lun: 00 > Vendor: DELL Model: MD1000 Rev: A.00 > Type: Enclosure ANSI SCSI revision: 05 > Host: scsi0 Channel: 02 Id: 00 Lun: 00 > Vendor: DELL Model: PERC 5/E Adapter Rev: 1.00 > Type: Direct-Access ANSI SCSI revision: 05 > Host: scsi1 Channel: 00 Id: 06 Lun: 00 > Vendor: PE/PV Model: 1x2 SCSI BP Rev: 1.0 > Type: Processor ANSI SCSI revision: 02 > Host: scsi1 Channel: 01 Id: 00 Lun: 00 > Vendor: MegaRAID Model: LD 0 RAID1 34G Rev: 521X > Type: Direct-Access ANSI SCSI revision: 02 > > I also updated the controller's ancient firmware and drivers (though > these will take effect only after a reboot). > > Once all users on my system have backed-up their data, I will be able > to do a reboot and any further maintenance (which hopefully should be > soon). (This was my only reason for not being able to do a reboot > yet.) > > However, after reading through all the documentation on the Server > Administration software and the controller manuals, I'm still unsure > if expanding a hardware RAID is possible (and if so, how to perhaps do > it). (Some parts of the manuals seem to indicate that simply > installing the additional HDs is enough; the raid controller (during > reboot) will automatically detect the new drives and expand the RAID - > not sure if I've interpreted this correctly or not). > > Any tips at all would be very helpful! > > Thanks > Best > Anil > > On Tue, Sep 1, 2009 at 12:33 AM, David Lethe<david@xxxxxxxxxxxx> wrote: >> The answer to #2 is a function of the make/model of hardware RAID, and the >> configuration. Sorry. While there are standards for what RAID-5 means, >> there is no built-in universal program that will configure all RAID >> subsystems. >> >> Dell supports several RAID controllers. >> >> The answer to #1 is also, unfortunately a function of the make/model of >> RAID. You can enter cat /proc/scsi/scsi and see if PERC, or DELL or LSI >> shows up in the vendor field. If so, highly probable it is RAID, but that >> won't tell you if it is RAID0, 1, 10, 5, etc... If there are entries in >> /dev/mpt, then it is a LSI-based RAID controller. (But not necessarily in a >> hardware protected RAID mode) >> >> If it says PERC or LSI, it is definitely a RAID config, but the config could >> be set up so you see individual disk drives, or it could be a n-DISK RAID5 >> that is partitioned into individual disks. >> >> If it is hardware RAID, then I suggest, based solely on the newbie questions >> that you find the documentation and read a bit, and run whatever software >> that comes with it to assess the situation. Expanding a hardware RAIDset, >> can be dangerous, especially if you are unfamiliar with it. >> >> For example, maybe the firmware is ancient, or you have a lot of bad blocks >> because you never fixed them, or even knew about running consistency/repairs >> . If you don't know what you are doing, then you can easily lose everything. >> >> So FIRST thing I would do before so much as powering off is a full backup. >> If you don't know what you have, then obviously you can't properly maintain >> it. (Not trying to put you down, but if you aren't willing or able to >> examine the configuration while it is powered on, and you don't want to do a >> reboot indicates the system may be unstable, or is mission critical and has >> no maintenance window, or you just don't know how to bring it back up >> properly. If any of those are the case, back up before something fails. >> >> Remember disk drives have a 100% probability of failure ... Eventually. You >> just don't want it to happen while you are responsible for the system. >> >> >> P.S. Did you just try the simple thing of logging onto Dell's support site >> and entering the service tag and get the configuration that they originally >> shipped? >> >> >> >> On 8/31/09 7:53 PM, "Anil Raj" <anil.calvin@xxxxxxxxx> wrote: >> >>> current RAID setup to include >>> the new drives. Is there any documentation on expanding hardware RAID? >>> ( I found doc on growing software RAID on the mailing list's wiki but >>> none on hardware RAID.) >>> >>> I really really hope someone can help me with these questions, please. >>> Also, if this is not the right forum (and there is a more relevant >>> forum) for these questions, please do let >> >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
