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 ?
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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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.
ASKER
i will adopt "Richardson" suggestion because next years we are plan move to new SAN ,so may i know what is the risk ?
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:
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.
@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.
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.
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.
ASKER
Great ...Thanks for everyone who are involve answering for my question .I will raise another topic to discuss regrading this storage.Thanks
You're welcome and don't forget close the question choosing the correct answers.
User told that will apply the suggestions.
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