Adding new disk drives to EVA5000 and HP-UX

[Mike Tufariello]

I have an RP7420 HP-UX system attached to an EVA5000. The EVA5000 has 8 trays, running a Raid 1 configuration. I also have Online JFS filesystem. I need to add additional space to certain mount points. I have check the available space in each VG by looking at the free PEs. I do not have enough space available to add to my mount points. So I know that I need to buy and install additional disk drives. I know in Raid 1 config for every drive I install I have to install a matching drive for Raid 1. I've tried to comply with the minimum of 8 drives per VG. So a number of questions come up.

1) How do I add drives to the EVA5000?
2) Should the new drives be the same size as the drives in the current VG?
3) How do I get the HP-UX system to see the new drives?
4) How do I carve the drives up?
5) How do I assign the carved up drives to certain mount points?
6) Am I forgettnig any thing else?

As always thanks for you help.

[Torsten.]

I'm not sure about your current config, but try to answer your questions:

1) just plug in and add them to a disk group
2) not a bad idea, but not mandatory
3) the server can't see the drives, only vdisks. so create a vdisk and present it to your server
4) just create vdisks with a size you need
5) the presented vdisks are seen like a disk. create a VG (or add it to an existing VG) and create LVOLs. make a filesystem on it and mount it.
6) not sure ;-)

[Steven E. Protter]

Shalom,

1) You buy compatible drives and stick them in the next available slot.
2) No, they can be bigger or smalling depending on your needs. Make sure they are of similar performance, mixing on 10K drives with 15K drives can impact overall performance though the EVA folks deny this concept.
3) See 4
4) You use the control station for the EVA to allocate the drives to LUNS.
5) Add the space to the LUNs in 4 and then lvextend the logical volume
6) With Online JFS you need not umount the filesystem to extend it.

I recommend you continue your raid 1 configuration and therefore you will need to allocate drives to the various LUNs in pairs. It is always better to handle raid on the EVA than with mirror/ux

SEP

[Mike Tufariello]

Torsten and Steven,

Hello and thanks for your replies. After reading your responses I reviewed command view on my SAN appliance for my EVA. I think I follow your logic but do not know the commands or process to create LUNS or Vdisks from the newly installed disk drives. Nor do I know how to make sure that if I have inserted 2 new drives that the second of the 2 drives will be dedicated to RAID1. Can you offer any help or point me to EVA documents?

Thanks,