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0

Rebuild time with 8 TB will be horrendous. I've tested rebuild time of RAID-6 arrays of 8 HGST He8 drives on Adaptec 7xx5 controllers at more than 48 hours. RAID-5 has been dead for many years. R1E is probably much faster at rebuilds, but will face the same danger of URE when rebuilding. With very good disks such as He8, I'd risk 1E; with any other model, ...


0

I use RAID1 with SSD's from about an year. There are no problems there, but having different drives sometimes may kill write performance. There were some option - "writemostly" - check about it. I use this option on one server where I do raid with sata and ram disk.


1

The VSphere ESXi installation is tiny (<8GB), you'll be wasting a huge amount of space putting it on it's own RAID 1. Go with option 1.


7

You should carefully consider whether RAID 5 will work for you especially in a RAID rebuild situation. The amount of reads required to rebuild a RAID 5 array is significant and can fall foul of an Unrecoverable Read Error (URE) which will cause you to loose the array and have to recover the data from backups. For example typical 8TB drives have 1 URE per ...


13

The answer hasn't been RAID 5 for at least a decade, it's as dead as punch-tape - use 4 disks and RAID 10 it.


0

Had the same issue... you just need to install the HP version of ESXi... Search google for HP Custom Image for VMware ESXi 6.0, login with your HP account and hey presto! Yo may need to register if you do not have an account :o)


0

I had a similar issue and for me it required to do: megacli -PDMakeGood -PhysDrv '[64:6]' -Force -a0 After that I could create the raid with the CfgLdAdd command.


0

i am googling for info between the 2, and i bump across this post. here are my findings... from - http://www8.hp.com/h20195/v2/getpdf.aspx/c04346299.pdf?ver=1.0 and http://www.hp.com/hpinfo/newsroom/press_kits/2014/ComputeEra/HP_SmartStorage_ProLiantGen9_DataSheet.pdf HP Smart Array P440 Controller comes in a PCIe 3.0 low-profile, half-height form factor, ...


1

No, you don't need to do any of this. Furthermore, you can even do (and this is preferable way of doing it in production) it without rebooting server or operation system. This is a common principle of operation of raid controllers.


1

You cannot do what you're intended to do with a built-in software RAID from Microsoft. Reason is within Windows network stack comes earlier than storage stack so your RAID will always start in broken state and will do long and painful resyncs and rebalances and rechecks. You may however use some third-party software to aggregate iSCSI volumes into sort of a ...


1

Finally worked out the problem inadvertedly whilst installing ESXi instead and receiving an error regarding the partition tables. Solution: run gPartEd and manually init an MBR on the small logical disk and a GPT on the larger disk. ESXi installed then which led me to try Windows on bare metal again, and like clock work, it booted fine after install. You ...


0

You need to use HP's RAID utilities to get this information. I;m assuming you did not build this server. This information is readily available from the HP Smart Storage Administrator utility. It's called hpssacli. Please try running that command. For RHEL6, the download link is here. Once in, you can type: ctrl all show config and ctrl all show config ...


-2

Wanting to glue together multiple iscsi targets is a perfectly valid idea. There are plenty of reasons you'd want to do it. Here is a simple scenario: 1) I've got 2 servers, and each has 12 disks in a Raid6, giving me 36TB usable space on each server. All of that storage is already RAIDed, to provide redundancy and protect from disk failures etc. 2) I ...


0

It has already been said in Setup SunFire 440 Raid Configuration that the onboard controller only supports mirroring, no raid 5. As per http://docs.oracle.com/cd/E19088-01/v440.srvr/816-7728-10/816-7728-10.pdf : On the Sun Fire V440 server, the Ultra-4 SCSI controller supports internal hardware disk mirroring using the Solaris operating environment raidctl ...


0

Software: Solaris 10: use SVM metainit command as linked in the comments already Solaris 11: use ZFS (raidZ), see http://docs.oracle.com/cd/E53394_01/html/E54801/gcvjg.html#scrolltoc Hardware: RAID 5 not supported by the controller on the V440. Mirroring is supported though. Use the raidctl command, see ...


4

HUGE issue: (May be a teeny bit off-topic - but I'ts imporant!) When you are dealing with SSDs - (as is often the case, or may be either the case or temptation) - a lot of SSDs have a nasty problem where they cannot always recover from spontaneous power outages! This is a tiny problem with HDDs. HDDs usually have enough capacitance to power their logic ...


5

There are at least a few things that could cause problems with SOME drive types: Drives that are not meant to deal with the vibration load of a chassis having many drives (unlikely problem with any drive specified as RAID/NAS-capable) Firmware that does not allow TLER, or needs time-consuming manual reconfiguration of the drive to enable it (ditto) Drives ...


25

There's an interesting intersection of server design, disk technology and economics here: Also see: Why are Large Form Factor (LFF) disks still fairly prevelant? The move toward dense rackmount and small form-factor servers. E.g. you don't see many tower offerings anymore from the major manufacturers, whereas the denser product lines enjoy more frequent ...


0

In the meantime: We have purchased the PERC H700 controller. it does not fit into the RAID slot, due to the presence of a holder in the 2970 case and a unlucky placed cooler on the controller. the controller works in the PCIe slots, problem now is getting cables of proper size. You need at least 75cm long cables of type SFF-8484 - SFF-8087. This was not ...


2

This is a "classical" problem on RAID5 arrays: when one disk die, you discover the others have developped bad sectors. Under this circumstance, many hardware RAID controllers simply drop the entire array (or refuse to start it). If your RAID controller has a "forced" mode to bring the array online (albeit with some unavoidable data corruption), use it. If ...


0

An interesting project is bcache: https://bcache.evilpiepirate.org/ With bcache you can set up a ssd as a fast cache of a slow (rotating) bigger disk. In this way, the most accessed blocks will be read (and written if so configured) from (to) the faster ssd, while preserving the bigger filesystem on the slower disks.


1

Based on the lvmcache man page it really seems like caching is entirely a logical volume thing and not something you can implement on the volume group level. It does seem annoying to not be able to cache an entire VG but this seems to be an architectural limitation. Regarding forcing an LV to be created using only specific PVs, you can specify the PVs at ...


0

everyone case is different, so no need to be disparaging to one another. What vital information that wasn't asked or missing from the original post is what kind of redundancy he wants or has in mind in addition to any DR plan with what hardware to support it, and what is an acceptable amount of loss if you choose a point in time backup/restore. I ...


0

Well, sometimes one is pretty dumb. I generated a new root password with the following command and restarted the server: openssl passwd -1 newpassword


0

Having a similar issue here. Configuration is an Intel RS2BL040 RAID controller (rebranded LSI I'm sure). 4 hard drives in a RAID10 configuration. Failed drive was replaced months ago. Server was rebooted for the first time and RAID controller started beeping even though everything shows as optimal. I noticed a drive (assuming the drive that was ...


0

You can't. If you want md to "scrub the bits" then you have to mount the files read-write.


0

Does this error has anything to do with the hard drive ? Note that this is the ONLY question you ask, so I answer it. OBVIOUSLY a Raid degraded error shown from the RAID BIOS (before even trying to load windows) indicates an issue with the hard discs, either now or at some point. And as obvious this has NOTHING to do with Windows at all. The ...


0

You can add physical disks to the array if you wish. That can be completed without downtime. You can also replace the drives with larger disks one-by-one. This is all covered in the HP Smart Array Controllers reference guide... Also see: HP RAID array - hpacucli What are the good ways to migrate a RAID array to bigger disks? Reconfigure HP Smart Array ...



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