Anonymous_User Absent Member.
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Hot Swap

I'm going to install 8 drives into my dell server (you know the one I've
been talking about) in a raid 5 config. What I'm wondering about is
whether to have two hot swaps or one. I know that's probably a silly
question and I was only going to go for one, but then somebody went and
suggested two. What's the opinion of those here?
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9 Replies
grimlock1 Absent Member.
Absent Member.

Re: Hot Swap

Matthew wrote:
> I'm going to install 8 drives into my dell server (you know the one I've
> been talking about) in a raid 5 config. What I'm wondering about is
> whether to have two hot swaps or one. I know that's probably a silly
> question and I was only going to go for one, but then somebody went and
> suggested two. What's the opinion of those here?


The bigger the array in drives the better it is to have 2. It also is
good if it's a situation where you may not be able to get to replace the
spare right away.

It's not going to help you if you have multiple simultaneous drive
failures that blows the raid, but it's just a little more insurance.
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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

I don't do the hotswap....if you have hardware uplift they'll replace the
drive in a few hours anyway. If ther disk is in the server I figure it
should be used.


"Patrick Farrell" <pfarrell@packereng.com> wrote in message
news:Cq_Ml.7167$s8.3441@kovat.provo.novell.com...
> Matthew wrote:
>> I'm going to install 8 drives into my dell server (you know the one I've
>> been talking about) in a raid 5 config. What I'm wondering about is
>> whether to have two hot swaps or one. I know that's probably a silly
>> question and I was only going to go for one, but then somebody went and
>> suggested two. What's the opinion of those here?

>
> The bigger the array in drives the better it is to have 2. It also is good
> if it's a situation where you may not be able to get to replace the spare
> right away.
>
> It's not going to help you if you have multiple simultaneous drive
> failures that blows the raid, but it's just a little more insurance.



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grimlock1 Absent Member.
Absent Member.

Re: Hot Swap

Craig wrote:
> I don't do the hotswap....if you have hardware uplift they'll replace the
> drive in a few hours anyway. If ther disk is in the server I figure it
> should be used.


Yeah... that IF of yours is a killer...
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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

Patrick Farrell wrote:
> Matthew wrote:
>> I'm going to install 8 drives into my dell server (you know the one
>> I've been talking about) in a raid 5 config. What I'm wondering about
>> is whether to have two hot swaps or one. I know that's probably a
>> silly question and I was only going to go for one, but then somebody
>> went and suggested two. What's the opinion of those here?

>
> The bigger the array in drives the better it is to have 2. It also is
> good if it's a situation where you may not be able to get to replace the
> spare right away.
>
> It's not going to help you if you have multiple simultaneous drive
> failures that blows the raid, but it's just a little more insurance.


I had two fail out five fail on my sql server. What a mess that was.
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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

Craig wrote:
> I don't do the hotswap....if you have hardware uplift they'll replace the
> drive in a few hours anyway. If ther disk is in the server I figure it
> should be used.
>
>
> "Patrick Farrell" <pfarrell@packereng.com> wrote in message
> news:Cq_Ml.7167$s8.3441@kovat.provo.novell.com...
>> Matthew wrote:
>>> I'm going to install 8 drives into my dell server (you know the one I've
>>> been talking about) in a raid 5 config. What I'm wondering about is
>>> whether to have two hot swaps or one. I know that's probably a silly
>>> question and I was only going to go for one, but then somebody went and
>>> suggested two. What's the opinion of those here?

>> The bigger the array in drives the better it is to have 2. It also is good
>> if it's a situation where you may not be able to get to replace the spare
>> right away.
>>
>> It's not going to help you if you have multiple simultaneous drive
>> failures that blows the raid, but it's just a little more insurance.

>
>


I don't. I have no support on my server anymore. It's old (about two
years). It's never been used for anything so I'm throwing esxi on it
and gonna make it work hard for it's money. 😛
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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

>
> I had two fail out five fail on my sql server. What a mess that was.

Same here.
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grimlock1 Absent Member.
Absent Member.

Re: Hot Swap

Matthew wrote:
>
> I had two fail out five fail on my sql server. What a mess that was.


I've had 2 different brand servers with 2 different brand scsi cards
with 2 different brand external arrays connected lose an entire array.

Symptoms were the same in both cases. It says, missing members and
lists all drives. But it shows that I have all drives connected. So
basically it's saying I have these 9 drives here but none of them are
members of the array. Thank you backups...
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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

Whcih brand(s) for yous guys?


"Patrick Farrell" <pfarrell@packereng.com> wrote in message
news:%Q%Ml.7200$s8.4500@kovat.provo.novell.com...
> Matthew wrote:
>>
>> I had two fail out five fail on my sql server. What a mess that was.

>
> I've had 2 different brand servers with 2 different brand scsi cards with
> 2 different brand external arrays connected lose an entire array.
>
> Symptoms were the same in both cases. It says, missing members and lists
> all drives. But it shows that I have all drives connected. So basically
> it's saying I have these 9 drives here but none of them are members of the
> array. Thank you backups...



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Anonymous_User Absent Member.
Absent Member.

Re: Hot Swap

In article <L9_Ml.7166$s8.2331@kovat.provo.novell.com>, Matthew <"system
[spam]tyrant"@gmail[dot].com> says...
> I'm going to install 8 drives into my dell server (you know the one I've
> been talking about) in a raid 5 config. What I'm wondering about is
> whether to have two hot swaps or one. I know that's probably a silly
> question and I was only going to go for one, but then somebody went and
> suggested two. What's the opinion of those here?
>


Well, if it's a Dell, I'd say use two.

If it's something else, I'd say probably okay with 1

We had nothing but problems with the Dell Pedge 2500 series (mutliple
simultaenous drive failures in the RAID 5 system)

Spent lots of time doing restores.

With the HP setups we have, we've got 8 drives in a RAID5 array with 1
hot spare.

Although it helps to put the Insight agents on so you know when a drive
fails.

I'm not aware of any RAID5 system that can survive 2 simultaneous drive
failures (even a hot spare won't help because it takes time to rebuild
and if another drive dies at the same time you're hosed)

However, on our xiotech SAN we can survive 2 simultaneous drive
failures, but we have to use RAID-10 to do so.

But maybe other vendors have figured out the RAID5 situation.
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