Mailing List Archive: Netapp: toasters

raid group question for new aggregate

Index | Next | Previous | View Threaded

klises at caminomedical

Feb 15, 2008, 8:17 AM

Post #1 of 4 (1791 views)
Permalink

raid group question for new aggregate

I checked the NOW site, and didn't really find anything that seemed
pertinent for 7.23 in regards to setting up number of spindles for raid
DP. I did read the 7.2 storage mgmt guide btw . Here is my situation:

I brought over 3 shelves from some older heads, and hot added to a
current loop. Shelves 2-4. Shelf 1 was already provisioned with 72GB
disks. Currently, I have 1 aggregate of 3 disk (root vol), and 9 disks
for another aggregate; 2 hot spares (full 72gb shelf, shelf 1)

Here is my question.

What is the best layout for raid dp for my new 3 shelves I just added?
I do not want to add the 3 new shelves to the existing aggregate.

I know the default is 16 when creating a new aggr, maybe I should
default to that. I don't know if I will be adding more disks in the
future to this aggregate.

Shelf 4 I have 1 shelf of 144gb 15k (14 spindles) new

Shelf 3 I have 1 shelf of 72gb 15k (14 spindles) new

Shelf 2 I have 1 shelf of 72gb 10k (14 spindles) new

Shelf 1 I have 1 shelf of 72gb 15k (14 spindles) already
provisioned

I want to dedicate at least 1 or 2 hot spares for the 144gb (obviously).
I already have 2 hot spares from shelf 1.

I care more about performance then raid reconstruct in the event of a
disk failure. This aggregate will be used primarily for CIFS.

If I missed a document that discusses this better, please let me know.

Thanks!!

scott.belisle at americas

Feb 20, 2008, 8:54 AM

Post #2 of 4 (1740 views)
Permalink

Re: raid group question for new aggregate [In reply to]

I would recommend grouping all your 15k drives in one aggr, and all the
10k drives in another. Use the default 16 disk setting. This should give
you optimal performance. I'd also keep a single 144GB and single 72GB as
spares. RaidDP gives you pretty decent protection so you shouldn't need a
spare per shelf. I personally use one spare per 3 shelves of a drive type
especially with FC drives. My 2 cents =)

Thanks,
Scott

Internet
klises [at] caminomedical

Sent by: owner-toasters [at] mathworks
02/15/2008 11:17 AM

To
toasters
cc

Subject
raid group question for new aggregate

I checked the NOW site, and didn't really find anything that seemed
pertinent for 7.23 in regards to setting up number of spindles for raid
DP. I did read the 7.2 storage mgmt guide btw . Here is my situation:

I brought over 3 shelves from some older heads, and hot added to a
current loop. Shelves 2-4. Shelf 1 was already provisioned with 72GB
disks. Currently, I have 1 aggregate of 3 disk (root vol), and 9 disks
for another aggregate; 2 hot spares (full 72gb shelf, shelf 1)

Here is my question.

What is the best layout for raid dp for my new 3 shelves I just added?
I do not want to add the 3 new shelves to the existing aggregate.

I know the default is 16 when creating a new aggr, maybe I should
default to that. I don't know if I will be adding more disks in the
future to this aggregate.

Shelf 4 I have 1 shelf of 144gb 15k (14 spindles) new

Shelf 3 I have 1 shelf of 72gb 15k (14 spindles) new

Shelf 2 I have 1 shelf of 72gb 10k (14 spindles) new

Shelf 1 I have 1 shelf of 72gb 15k (14 spindles) already
provisioned

I want to dedicate at least 1 or 2 hot spares for the 144gb (obviously).
I already have 2 hot spares from shelf 1.

I care more about performance then raid reconstruct in the event of a
disk failure. This aggregate will be used primarily for CIFS.

If I missed a document that discusses this better, please let me know.

Thanks!!

This message and any attachments (the "message") is intended solely for
the addressees and is confidential. If you receive this message in error,
please delete it and immediately notify the sender. Any use not in accord
with its purpose, any dissemination or disclosure, either whole or partial,
is prohibited except formal approval. The internet can not guarantee the
integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will)
not therefore be liable for the message if modified. Please note that certain
functions and services for BNP Paribas may be performed by BNP Paribas RCC, Inc.

Attachments:

C.htm (8.34 KB)

nick at nicholasbernstein

Feb 20, 2008, 6:39 PM

Post #3 of 4 (1741 views)
Permalink

Re: raid group question for new aggregate [In reply to]

Scott is on the money, although Išd make two comments:
- disk replacement depends on how hard you push your disks & personally
I would use 1 disk / shelf + 1 spare initially and throttle back over time
based on trending data.
- DP is strong protection, but a magnetic media failure and + single
disk failure can be a double disk failure for a single file... Unlikely with
disk scrubbing, but if youšve got very important data it might be wise to
keep the extra disks kicking around.

-Nick

On 2/20/08 8:54 AM, "scott.belisle [at] americas"
<scott.belisle [at] americas> wrote:

>
> I would recommend grouping all your 15k drives in one aggr, and all the 10k
> drives in another. Use the default 16 disk setting. This should give you
> optimal performance. I'd also keep a single 144GB and single 72GB as spares.
> RaidDP gives you pretty decent protection so you shouldn't need a spare per
> shelf. I personally use one spare per 3 shelves of a drive type especially
> with FC drives. My 2 cents =)
>
> Thanks,
> Scott
>
>
>
>
>
> Internet
> klises [at] caminomedical
> Sent by: owner-toasters [at] mathworks 02/15/2008 11:17 AM
> To
> toasters
> cc
> Subject
> raid group question for new aggregate
>
>
>
> I checked the NOW site, and didn't really find anything that seemed
> pertinent for 7.23 in regards to setting up number of spindles for raid
> DP. I did read the 7.2 storage mgmt guide btw . Here is my situation:
>
>
>
>
>
> I brought over 3 shelves from some older heads, and hot added to a
> current loop. Shelves 2-4. Shelf 1 was already provisioned with 72GB
> disks. Currently, I have 1 aggregate of 3 disk (root vol), and 9 disks
> for another aggregate; 2 hot spares (full 72gb shelf, shelf 1)
>
>
>
> Here is my question.
>
>
>
> What is the best layout for raid dp for my new 3 shelves I just added?
> I do not want to add the 3 new shelves to the existing aggregate.
>
>
>
> I know the default is 16 when creating a new aggr, maybe I should
> default to that. I don't know if I will be adding more disks in the
> future to this aggregate.
>
>
>
> Shelf 4 I have 1 shelf of 144gb 15k (14 spindles) new
>
>
> Shelf 3 I have 1 shelf of 72gb 15k (14 spindles) new
>
> Shelf 2 I have 1 shelf of 72gb 10k (14 spindles) new
>
> Shelf 1 I have 1 shelf of 72gb 15k (14 spindles) already
> provisioned
>
>
>
> I want to dedicate at least 1 or 2 hot spares for the 144gb (obviously).
> I already have 2 hot spares from shelf 1.
>
>
>
>
>
> I care more about performance then raid reconstruct in the event of a
> disk failure. This aggregate will be used primarily for CIFS.
>
>
>
>
>
> If I missed a document that discusses this better, please let me know.
>
>
>
> Thanks!!
>
>
>
>
> This message and any attachments (the "message") is intended solely for
> the addressees and is confidential. If you receive this message in error,
> please delete it and immediately notify the sender. Any use not in accord
> with its purpose, any dissemination or disclosure, either whole or partial,
> is prohibited except formal approval. The internet can not guarantee the
> integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will)
> not therefore be liable for the message if modified. Please note that certain
> functions and services for BNP Paribas may be performed by BNP Paribas RCC,
> Inc.
>

klises at caminomedical

Feb 20, 2008, 6:44 PM

Post #4 of 4 (1749 views)
Permalink

RE: raid group question for new aggregate [In reply to]

Thanks Toasters! Lots of great info on these posts.

________________________________

From: Nicholas Bernstein [mailto:nick [at] nicholasbernstein]
Sent: Wed 2/20/2008 6:39 PM
To: scott.belisle [at] americas; Klise, Steve
Cc: owner-toasters [at] mathworks; Toasters
Subject: Re: raid group question for new aggregate

Scott is on the money, although I'd make two comments:
- disk replacement depends on how hard you push your disks & personally I would use 1 disk / shelf + 1 spare initially and throttle back over time based on trending data.
- DP is strong protection, but a magnetic media failure and + single disk failure can be a double disk failure for a single file... Unlikely with disk scrubbing, but if you've got very important data it might be wise to keep the extra disks kicking around.

-Nick

On 2/20/08 8:54 AM, "scott.belisle [at] americas" <scott.belisle [at] americas> wrote:

I would recommend grouping all your 15k drives in one aggr, and all the 10k drives in another. Use the default 16 disk setting. This should give you optimal performance. I'd also keep a single 144GB and single 72GB as spares. RaidDP gives you pretty decent protection so you shouldn't need a spare per shelf. I personally use one spare per 3 shelves of a drive type especially with FC drives. My 2 cents =)

Thanks,
Scott

Internet
klises [at] caminomedical
Sent by: owner-toasters [at] mathworks 02/15/2008 11:17 AM

To

toasters

cc
Subject

raid group question for new aggregate

I checked the NOW site, and didn't really find anything that seemed
pertinent for 7.23 in regards to setting up number of spindles for raid
DP. I did read the 7.2 storage mgmt guide btw . Here is my situation:

I brought over 3 shelves from some older heads, and hot added to a
current loop. Shelves 2-4. Shelf 1 was already provisioned with 72GB
disks. Currently, I have 1 aggregate of 3 disk (root vol), and 9 disks
for another aggregate; 2 hot spares (full 72gb shelf, shelf 1)

Here is my question.

What is the best layout for raid dp for my new 3 shelves I just added?
I do not want to add the 3 new shelves to the existing aggregate.

I know the default is 16 when creating a new aggr, maybe I should
default to that. I don't know if I will be adding more disks in the
future to this aggregate.

Shelf 4 I have 1 shelf of 144gb 15k (14 spindles) new

Shelf 3 I have 1 shelf of 72gb 15k (14 spindles) new

Shelf 2 I have 1 shelf of 72gb 10k (14 spindles) new

Shelf 1 I have 1 shelf of 72gb 15k (14 spindles) already
provisioned

I want to dedicate at least 1 or 2 hot spares for the 144gb (obviously).
I already have 2 hot spares from shelf 1.

I care more about performance then raid reconstruct in the event of a
disk failure. This aggregate will be used primarily for CIFS.

If I missed a document that discusses this better, please let me know.

Thanks!!

This message and any attachments (the "message") is intended solely for
the addressees and is confidential. If you receive this message in error,
please delete it and immediately notify the sender. Any use not in accord
with its purpose, any dissemination or disclosure, either whole or partial,
is prohibited except formal approval. The internet can not guarantee the
integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will)
not therefore be liable for the message if modified. Please note that certain
functions and services for BNP Paribas may be performed by BNP Paribas RCC, Inc.

Index | Next | Previous | View Threaded

Interested in having your list archived? Contact Gossamer Threads