topic Re: EVA VDisk Question in HPE EVA Storage

EVA VDisk Question

Brett Barton — Wed, 08 Jun 2011 14:49:59 GMT

I need to setup storage space on our SAN for a new set of windows servers, requiring approximately 800GB of space for the system drive partitions.

Would it be wise to split this 800GB into multiple groups? For example two 400GB VDISKS, or four 200GB VDISKS?

I am wondering if this could help avoid downtime if a VDISK became "corrupt." However, I am not sure if just one VDISK can become corrupt at a time, or if all the VDISKS on a disk group become corrupted at once.

Thanks
Brett

Re: EVA VDisk Question

Sheldon Smith — Thu, 09 Jun 2011 00:06:16 GMT

I'm not sure I understand what you're asking. You want to have an appropriately-sized VDISK for each server's system drive.

Re: EVA VDisk Question

cjb_1 — Thu, 09 Jun 2011 07:11:09 GMT

Never experienced a vdisk getting corrupt so may as well have one big disk?

However, your question suggests multiple servers accessing this disk? If that's the case it's probably wiser to provide a vdisk to each and size accordingly as suggested above. Be easier to manage.

Re: EVA VDisk Question

Azadeh — Thu, 09 Jun 2011 09:15:33 GMT

Best practices don't recommend it. Use RAID 10 if you are worried about your data.

Re: EVA VDisk Question

cjb_1 — Thu, 09 Jun 2011 09:33:44 GMT

No raid-10 on an eva.. The data protection is pretty good though, you'ld need multiple disk failures in specific rss's before you got worried.

Re: EVA VDisk Question

Sheldon Smith — Thu, 09 Jun 2011 10:44:48 GMT

vRAID1 *is* RAID-10 everywhere else. The span is across all the physical disks *in* the selected disk group.

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Re: EVA VDisk Question

SUBHAJIT KHANBARMAN_1 — Thu, 09 Jun 2011 15:20:23 GMT

Always recommended to create a single vdisk for the single server.

If you have multiple server, yes it is good to have multiple vdisks for each server.

Again at the same time, in cluster environment you can present the same LUN to different servers as a shared storage.

Never think about the data corruption.

When the Vdisk presented to the server, after that need to create physical volume, logical volume and then file system. So if data corruption happened that should be in the file system level.

EVA virtualization came to reduce these circumstances.

Even entire disk enclosure failure also can't make the EVA down. That's y RSS concept is great here.

Re: EVA VDisk Question

Brett Barton — Fri, 10 Jun 2011 10:44:06 GMT

I forgot one important detail. The LUN is presented to our ESX cluster. From there we create a datastore on the 800GB LUN.

So my question should be should I break the 800GB into multiple VDISKs so that I dont "have all my eggs in one basket." Except, instead of eggs, they are VMWare .vmdk files.

Sorry!

Re: EVA VDisk Question

Sheldon Smith — Fri, 18 Jun 2021 09:48:09 GMT

Yes, that *is* an important detail!

See the technical paper http://h20195.www2.hp.com/v2/getdocument.aspx?docname=4AA1-2185ENW.pdf

You may want to search for:
best practices EVA VMware vSphere

Re: EVA VDisk Question

users_storage — Sun, 07 Aug 2011 15:15:10 GMT

Can you help me out max vdisk size we can present to single windows host?

@Sheldon Smith wrote:
I'm not sure I understand what you're asking. You want to have an appropriately-sized VDISK for each server's system drive.

Re: EVA VDisk Question

Sheldon Smith — Thu, 25 Aug 2011 21:17:25 GMT

Depends on the version of Windows. With Windows 2008, as far as I know you can present any size vdisk. However, the larger a single vdisk is, the longer actions like backup and restore will take.