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April 25th, 2013 07:00
PowerPath and UUID´s in Linux
Hello EMC Community,
I have a doubt that maybe some of you have already figured out. I have a backup software that requires that all the devices presented in Linux to have different UUID´s. Since this server is using PowerPath, I have four devices, all with the same UUID (sda, sdb, sdc and sdd). Is it safe to change these UUID´s? Will Powerpath be able to create emcpowera device if I change these UUID´s?
Here is some information:
----- PowerPath
powermt display dev=all
Pseudo name=emcpowera
CLARiiON ID=CKM00102600265 [SG_KK]
Logical device ID=600601607181290074EAD40CF9F7E011
state=alive; policy=CLAROpt; priority=0; queued-IOs=0;
Owner: default=SP B, current=SP B Array failover mode: 4
==============================================================================
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
0 qla2xxx sda SP A0 active alive 0 0
0 qla2xxx sdb SP B0 active alive 0 0
1 qla2xxx sdc SP B0 active alive 0 0
1 qla2xxx sdd SP A0 active alive 0 0
----- BLKID
/dev/sda1: LABEL="/boot" UUID="9b601568-c4db-401f-a613-1aaebbeaa14a" TYPE="ext3"
/dev/sda2: LABEL="SWAP-sdc2" TYPE="swap"
/dev/sda3: LABEL="/" UUID="05da992c-1b20-486c-b58c-489a48ddb647" TYPE="ext3"
/dev/sdb1: LABEL="/boot" UUID="9b601568-c4db-401f-a613-1aaebbeaa14a" TYPE="ext3"
/dev/sdb2: LABEL="SWAP-sdc2" TYPE="swap"
/dev/sdb3: LABEL="/" UUID="05da992c-1b20-486c-b58c-489a48ddb647" TYPE="ext3"
/dev/sdc1: LABEL="/boot" UUID="9b601568-c4db-401f-a613-1aaebbeaa14a" TYPE="ext3"
/dev/sdc2: LABEL="SWAP-sdc2" TYPE="swap"
/dev/sdc3: LABEL="/" UUID="05da992c-1b20-486c-b58c-489a48ddb647" TYPE="ext3"
/dev/sdd1: LABEL="/boot" UUID="9b601568-c4db-401f-a613-1aaebbeaa14a" TYPE="ext3"
/dev/sdd2: LABEL="SWAP-sdc2" TYPE="swap"
/dev/sdd3: LABEL="/" UUID="05da992c-1b20-486c-b58c-489a48ddb647" TYPE="ext3"
/dev/emcpowera1: LABEL="/boot" UUID="9b601568-c4db-401f-a613-1aaebbeaa14a" TYPE="ext3"
/dev/emcpowera2: LABEL="SWAP-sdc2" TYPE="swap"
/dev/emcpowera3: LABEL="/" UUID="05da992c-1b20-486c-b58c-489a48ddb647" TYPE="ext3"
Thank You!
dynamox
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April 25th, 2013 07:00
why change UUID, can't your backup application use emcpower devices ?
marsupillami
3 Posts
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April 25th, 2013 15:00
Hello dynamox,
Thank you for your reply.
Actually it uses empower devices in order to backup, however it always checks for duplicate UUID´s. I´ve been in contact with the creators of this software and they are asking me to change UUID´s.
I believe it is a "safety" feature since this is a block backup software.
dynamox
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20.4K Posts
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April 25th, 2013 15:00
i would not change UUID, they are the same because they point to the same block device. What does this backup application is trying to do that they need access to pseudo devices ? Is this some kind of raw file system backup ?
marsupillami
3 Posts
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April 26th, 2013 02:00
Hello Dynamox,
Yes, this is a backup software that creates backups based on blocks, treating OS as a raw block device. Probably that´s why they require different UUID´s.
dynamox
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April 26th, 2013 04:00
can you ask the vendor why they can't work with emcpower devices