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Francisco_Valen
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August 18th, 2016 12:00
Unity Spare Drives
When i'm configuring a new Unity with the "Unity Sizer", the tool ask me for add hot spares, but never takes in count the vault drives as disks that need a hot spare.
For example, i can configure a pool with SAS 1,2 TB disks, and vault drives with SAS 600 GB disks, and never asks for spares to support the vault drives.
It is necessary add manually spare disks for the vault drives or these disks doesn't need a spare disk?
Thanks in advance.
Rainer_EMC
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Posted August 19th, 2016 03:00
for Unity Sizer questions please use the Unity sizer support EMail
Rainer_EMC
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Posted August 19th, 2016 03:00
besides a 1.2 TB SAS disk can spare for a 600 GB SAS disk
please see the hot sparing rules in the white paper and FAQ
Francisco_Valen
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Posted August 19th, 2016 06:00
OK, according your answer, i assume that i need a spare drive for the vault disks?
Because in the VNX2 the spare policy alert me if i don't have the necessary disks to spare the first four disks (vault drives), assuming that those ones are a different type compared with the data disks, used in storage pools.
Rainer_EMC
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Posted August 19th, 2016 09:00
VNX2 uses the same sparing rules as Unity - only enforcement is different
please re-read the rules
Rainer_EMC
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Posted August 19th, 2016 09:00
yes
while the system area itself on the "vault drives" doesn't need a spare any user data on it does
Francisco_Valen
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Posted August 19th, 2016 14:00
Perfect! that the answer i was looking for. Thanks
Rainer_EMC
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Posted August 20th, 2016 01:00
in terms of computing how many spares are needed the number of total disks are used - and that includes all disks installed in the system
it doesn't matter for the spare count needed whether or not there is user data on the system drives
ahmetmehmetyiki
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Posted September 20th, 2016 13:00
Hi Dear experts ,
how many drives unity 600 support maximum exactly currently ?
Rainer_EMC
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Posted September 21st, 2016 01:00
Keep in mind that the hot spare quantity has slightly changed in the just released Unity SP1
It changes from 1 spare for 30 drives to 1 spare for 31 drives.
more details are in the Unity White Paper
kelleg
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Posted August 19th, 2016 14:00
Vault drives do not use Hot Spare unless you have created a Pool using the vault disks. If you do not use the Vault drives for user data (not configured in a Pool), then there is no Hot Spare requirement. When a Vault Drive fails, you just replace the drive (Vault drives can only be physically in the first four slots).
glen