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VG7100 Active Spare

Linda Cooper
Occasional Contributor

VG7100 Active Spare

I only have one active spare on my array. I was told this was not enough, that they had seen 2 drives go down at once. How many do most of you have?
10 REPLIES
Navid HUSSAIN_2
Frequent Advisor

Re: VG7100 Active Spare

Hi,

It is rare that 2 drives go down at once, If you really want to have more redundancy, then you may go for 2DP.

Thx

NH
Teamwork
Uwe Zessin
Honored Contributor

Re: VG7100 Active Spare

I thought I had read that the VA7100 (I guess VG7100 is a typo) does not support AUTORAID? Has that changed?
.
Linda Cooper
Occasional Contributor

Re: VG7100 Active Spare

You are correct that is a typo should be VA7100
Arend Lensen
Trusted Contributor

Re: VG7100 Active Spare

Hello Linda,
The VA will have 1 disk hotspare per RG when the number of disks in a RG are 15 or less. As soon as you add the 16th disk it will use 2, this is what happens when hotspare is set to auto, you can also select 1 or 2 disks manually if you like.

Regards,
Arend
Arend Lensen
Trusted Contributor

Re: VG7100 Active Spare

Forget to mention that the largest disk(s) will be used for hotspare size. And ALL VA arrays support raid-01 and autoraid mode.
Joshua Scott
Honored Contributor

Re: VG7100 Active Spare

2 drives may fail within a short time, but never "at once". if you have an active hot spare, then 2 drives may fail without any loss of data.

it works like this:

you have a drive fail, and the AHS takes over for it seamlessly, then if you have another failure, you simply have no redundancy. no data-loss. if you are operating in AUTORaid mode, then you can lose even more. you will just sacrifice performance as you go.

For *true* redundancy, you need the VA7110, which has 2 redundancy groups.

Josh
What are the chances...
Uwe Zessin
Honored Contributor

Re: VG7100 Active Spare

I don't understand - the two redundany groups just split the disks, well, into 2 groups. A LUN is always made from disks of one RG at a time.
.
Joshua Scott
Honored Contributor

Re: VG7100 Active Spare

Uwe,

yes, but with 2 RG, you are less likely to lose data with multiple drive failures.

Josh
What are the chances...
Uwe Zessin
Honored Contributor

Re: VG7100 Active Spare

I see, you hope that multiple disk failures are distributed equally between both RGs - don't ever let Murphy hear about this ;-)

I was puzzled, because you wrote:
"For *true* redundancy, you need the"
and thought you meant some form of redundany distributed over both RGs.
.
Joshua Scott
Honored Contributor

Re: VG7100 Active Spare

I misspoke. for true redundancy, you would need 2 VA7110s connected to 2 servers in a MC/SG configuration, with mirroring between the 2 VAs.

Josh
What are the chances...