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Adding HDD in IBM DS3512

We have one storage IBM DS3512 direct connected to our file server. I view in the storage management software group 1 is using 1TB X 5pcs configure as raid 5 and represent to OS as d:\data and group 2 is using 2 TB X 5 Pcs configured as raid 5 also and represent to OS is e:\backup.

Basically the e:\ for us to use as backup destination for all the server. Recently we have 2 new servers setup and we ate facing insufficient storage space for us to hold all the server backup data and causing the backup job failed.

In the physical panel of storage I can see we still have two empty slot ,so we are intend to add in n new HDD to increase the capacity for backup drive.

Based from scenario above please advice question below:
1.Can i add-in only one 2 TB HDD extend the array without any data lost if can, please guide me what is the proper procedure

2.Is that better is we Purchase 2 X 2 TB HDD configure using Raid 1 and represent new drive to OS and all the new server backup destination will be in new drive.

3.I had discuss with the management before the suggest they want adding only OK me hdd and extend the group 2 because they want to reserve one empty slot for group 1 .May I know which method should I apply  ?
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YaYangTeah
Asked:
YaYangTeah
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3 Solutions
 
Richardson PortoSenior Infrastructure SpecialistCommented:
1.Can i add-in only one 2 TB HDD extend the array without any data lost if can, please guide me what is the proper procedure
Yes, you can... for additional information see page #230 of the following IBM Redbook: http://www.redbooks.ibm.com/redbooks/pdfs/sg247914.pdf

2.Is that better is we Purchase 2 X 2 TB HDD configure using Raid 1 and represent new drive to OS and all the new server backup destination will be in new drive.
I prefer the first option.

3.I had discuss with the management before the suggest they want adding only OK me hdd and extend the group 2 because they want to reserve one empty slot for group 1 .May I know which method should I apply  ?
I will recommend the first option, this way you can leave a free slot for group 1.
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Gerald ConnollyCommented:
Please note that RAID-5 is no longer recommended for business use!

The size of modern disks means that the risk of a second disk failing while the first rebuilds has become unacceptably high.

Use RAID10 or RAID-6 instead.
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Handy HolderSaggar makers bottom knockerCommented:
Backup data so it's sequential, RAID 6 would be ideal since it can write full width stripes so the RAID 6 write penalty doesn't apply. If you have room in the rack just buy an EXP3000 to add 12 more disk bays, second hand will be fine so long as it works, it's not like using old disks that may be dodgy, the exp3000 enclosure is just electronics and metal.
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YaYangTeahAuthor Commented:
May i know any risk i need to bear  ?
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Handy HolderSaggar makers bottom knockerCommented:
No real risks adding an extra enclosure EXP3512 assuming you get the cables and interface modules included. You can even add the extra shelf live although I'd shut down the DS3512 if possible. Each controller has one SAS expansion and you just connect each of them to one of the "in" ports on the extra shelf. That will let you expand both disk groups and still leave a few extra slots for the future.
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YaYangTeahAuthor Commented:
i will adopt "Richardson" suggestion because next years we are plan move to new SAN ,so may i know what is the risk ?
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Richardson PortoSenior Infrastructure SpecialistCommented:
Risks always exist, so make sure you have a full backup.

According with official documentation the array size expansion can be done online, with some considerations, like the following:

This procedure might have a performance impact because the
expansion process competes with normal disk access. When possible, this type of activity
should be performed when I/O activity is at a minimum.
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Gerald ConnollyCommented:
@YaYangTeah, are you referring to my post?

The Risk is this!
RAID-5 has the ability to sustain the failure of one disk, but modern disk are so big that even if you have a hot spare, the time taken to rebuild the replacement has become unacceptably long, that means there is a risk that a second disk could fail before the rebuild is complete, and if that happens your data is lost.
You will then be depending on your backups and of course the disruption that goes with having to restore your system and replay all your transaction logs will give you.
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Handy HolderSaggar makers bottom knockerCommented:
RAID 5 also has the risk that one hard disk has bad blocks and then when another one fails you have holes in the data. That"s known as a punctured strupe because the stripe cannot be rebuilt from parity.
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YaYangTeahAuthor Commented:
Great ...Thanks for everyone who are involve answering for my question .I will raise another topic to discuss regrading this storage.Thanks
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Richardson PortoSenior Infrastructure SpecialistCommented:
You're welcome and don't forget close the question choosing the correct answers.
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Richardson PortoSenior Infrastructure SpecialistCommented:
User told that will apply the suggestions.
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