How to increase the size of a RAID 1 array from 750GB to 1TB? 3ware

Pretty strange (to say the least).

It sounds like someone (or something) has cause your RAID volume to split. If anyone else has admin authority over this device, I'd ask them if they might have inadvertently reconfigured the volume (maybe they thought they were looking when in fact they were changing). In any event, your primary RAID volume is in degraded mode because it no longer has a hot-spare.

I'd first make absolutely certain I have a 100% good backup (preferably a bare metal backup). The try to re-add the spare to primary RAID volume (the 3.87 TB) volume. You will probably have to delete the goofey new volume before the 3Ware controller will allow this operation.

WARNING: 3.87 TB is big and it will likely take you several days to recover from tape if you need to rebuild your primary RAID volume. If you can wait until Friday @ 5pm (assuming you're organization is not 24x7) and do the work, that would be the best choice. This way if you are forced to recover from backups, you'll have the weekend.

Jim C. http://www.kleobackup.net

I may have figured it out. I had the opportunity to test it on a spare machine:

I first had this:

# tw_cli /c0 show
Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache  AVrfy
------------------------------------------------------------------------------
u0    RAID-5    OK             -       -       256K    5587.9    RiW    ON

VPort Status         Unit Size      Type  Phy Encl-Slot    Model
------------------------------------------------------------------------------
p0    OK             u0   1.82 TB   SATA  0   -            ST32000542AS
p1    OK             u0   1.82 TB   SATA  1   -            ST32000542AS
p2    OK             u0   1.82 TB   SATA  2   -            ST32000542AS
p3    OK             u0   1.82 TB   SATA  3   -            ST32000542AS
p4    OK             -    1.82 TB   SATA  4   -            ST32000542AS

Name  OnlineState  BBUReady  Status    Volt     Temp     Hours  LastCapTest
---------------------------------------------------------------------------
bbu   On           Yes       OK        OK       OK       0      xx-xxx-xxxx

A 4 disk raid 5 and one extra disk.

Then I did this:

# tw_cli /c0/u0 migrate type=raid5 disk=4
Sending migration message to /c0/u0 ... Done.

Then I had this:

# tw_cli /c0/u0 show

Unit     UnitType  Status         %RCmpl  %V/I/M  Port  Stripe  Size(GB)
------------------------------------------------------------------------
u0       Migrator  MIGRATING      -       0%      -     -       -

su0      RAID-5    OK             -       -       -     256K    5587.9
su0-0    DISK      OK             -       -       p0    -       1862.63
su0-1    DISK      OK             -       -       p1    -       1862.63
su0-2    DISK      OK             -       -       p2    -       1862.63
su0-3    DISK      OK             -       -       p3    -       1862.63
su0/v0   Volume    -              -       -       -     -       50
su0/v1   Volume    -              -       -       -     -       5537.9

du0      RAID-5    OK             -       -       -     256K    7450.54
du0-0    DISK      OK             -       -       p0    -       1862.63
du0-1    DISK      OK             -       -       p1    -       1862.63
du0-2    DISK      OK             -       -       p2    -       1862.63
du0-3    DISK      OK             -       -       p3    -       1862.63
du0-4    DISK      OK             -       -       p4    -       1862.63
du0/v0   Volume    -              -       -       -     -       N/A
du0/v1   Volume    -              -       -       -     -       N/A

su0 and du0 are probably source and destination, giving me a new and bigger u0 at the end. I would think that du0/v0 and du0/v1 will become active when the migrating is done. But this is going to take a week to migrate and I don't know if I have the patience for that...