SVM-5
What we will learn in next Few Pages
·
HOT SPARE
SO, what is Hot Spare?
Allows automatic replacement of failed submirrors / Raid-5
components, provided space components are available & reserved
HOT SPARE STATES:
3 states
A. available
B. in-use
C. broken
a. Available:
Available hotspares are running and ready to accept data, but are not
currently being written to or read from.
b. In-use:
In-use hot spares are currently being written to and read from
c. Broken:
Broken hotspares are out of service.
A hot spare is placed in the broken state when an I/O error occurs
·
The number of hot spare pools is limited to 1000.
·
Hotsapre pools are named “hspnnn” where “nnn” is a
number in the range 000-999
·
A meta device cannot be configured as a Hotsapre
·
Avoid using small size of hotspares compare to
submirrors
·
If the entire hot spare are in use and a sub
mirror fails due to errors, that portion of the mirror will no longer be replicated.
CREATE
root@sol-test-2:>/# metainit hsp100 c1t2d0s3
hsp100: Hotspare pool is setup
root@sol-test-2:>/# metainit hsp200 c1t2d0s4 c1t2d0s05
hsp200: Hotspare pool is setup
root@sol-test-2:>/# metastat -c
d23 p 10MB d2
d22 p 10MB d2
d21 p 10MB d2
d2 r
298MB d11 d12 d13 d15
d11 p
100MB c1t2d0s0
d12 p
100MB c1t2d0s0
d13 p
100MB c1t2d0s0
d15 p
100MB c1t2d0s0
hsp200 h - c1t2d0s4 c1t2d0s5
hsp100 h - c1t2d0s3
Look, these are 2 different things hsp100 & c1t2d0s3
Hsp100 is Hotspare pool and c1t2d0s3 is hot spare
So if we want to remove then we must have to remove the spares first
then after pool.
HOTSPARE DELETE
root@sol-test-2:>/# metahs -d hsp200 c1t2d0s5
hsp200: Hotspare is deleted
root@sol-test-2:>/# metahs -d hsp200 c1t2d0s4
hsp200: Hotspare is deleted
POOL DELETE
root@sol-test-2:>/# metahs -d hsp200
hsp200: Hotspare pool is cleared
root@sol-test-2:>/# metastat -c
d23 p 10MB d2
d22 p 10MB d2
d21 p 10MB d2
d2 r
298MB d11 d12 d13 d15
d11 p
100MB c1t2d0s0
d12 p
100MB c1t2d0s0
d13 p
100MB c1t2d0s0
d15 p
100MB c1t2d0s0
hsp100 h - c1t2d0s3
HS POOL CREATE
root@sol-test-2:>/# metainit hsp399 c1t2d0s4 c1t2d0s05
hsp399: Hotspare pool is setup
HS DELETE
root@sol-test-2:>/# metahs -d hsp399 c1t2d0s4
hsp399: Hotspare is deleted
HS ADD TO EXISTING HS POOL
root@sol-test-2:>/# metahs -a hsp399 c1t2d0s4
hsp399: Hotspare is added
root@sol-test-2:>/# metastat -c
d23 p 10MB d2
d22 p 10MB d2
d21 p 10MB d2
d2 r
298MB d11 d12 d13 d15
d11 p
100MB c1t2d0s0
d12 p
100MB c1t2d0s0
d13 p
100MB c1t2d0s0
d15 p
100MB c1t2d0s0
hsp399 h - c1t2d0s5 c1t2d0s4
hsp100 h - c1t2d0s3
=============================
root@sol-test-2:>/# metahs -d hsp100 c1t2d0s3
hsp100: Hotspare is deleted
root@sol-test-2:>/# metahs -d hsp100
hsp100: Hotspare pool is cleared
=============================
I did this to free c1t2d0s3
REPLACE THE HOTSPARE
root@sol-test-2:>/# metahs -r hsp399 c1t2d0s5 c1t2d0s3
hsp399: Hotspare c1t2d0s5 is replaced with c1t2d0s3
root@sol-test-2:>/# metahs -r <POOLNAME> <OLD SPARE> <NEW
SPARE>
==============================
root@sol-test-2:>/# metaclear -f d2
metaclear: sol-test-2: d2: metadevice in use
root@sol-test-2:>/# metaclear -f d21 d22 d23
d21: Soft Partition is cleared
d22: Soft Partition is cleared
d23: Soft Partition is cleared
root@sol-test-2:>/# metaclear -f d2
d2: RAID is cleared
root@sol-test-2:>/# metaclear -f d15 d13 d12 d11
============================== removed
the raid5
Created new raid volume d3
root@sol-test-2:>/# metainit d3 -r c1t2d0s0 c1t2d0s1 c1t2d0s3
d3: RAID is setup
Created Hotspare pool
root@sol-test-2:>/# metahs -a hsp199 c1t2d0s4 c1t2d0s5
hsp199: Hotspares are added
root@sol-test-2:>/# metainit d9 -r c1t3d0s0 c1t4d0s0 c1t5d0s0
d9: RAID is setup
root@sol-test-2:>/# metahs -a hsp009 c1t6d0s0
root@sol-test-2:>/# metahs -a hsp009 c1t8d0s0
ATTACHING HSP TO RAID VOLUME
root@sol-test-2:>/# metaparam -h hsp009 d9
root@sol-test-2:>/# metastat d9
d9: RAID
State: Okay
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
root@sol-test-2:>/# newfs /dev/md/rdsk/d9
root@sol-test-2:>/# mount /dev/md/dsk/d9 /raidtest/
root@sol-test-2:>/raidtest# ls -l
-rw------T 1 root root
104857600 Oct 2 05:58 f1
-rw------T 1 root root
104857600 Oct 2 05:59 f2
Now I had removed one disk from the raid volume,
root@sol-test-2:>/raidtest# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c1t0d0 <DEFAULT
cyl 1563 alt 2 hd 255 sec 63>
/pci@0,0/pci15ad,1976@10/sd@0,0
1. c1t1d0 <DEFAULT
cyl 1564 alt 2 hd 255 sec 63>
/pci@0,0/pci15ad,1976@10/sd@1,0
2. c1t2d0 <DEFAULT
cyl 1563 alt 2 hd 255 sec 63>
/pci@0,0/pci15ad,1976@10/sd@2,0
3. c1t3d0 <DEFAULT
cyl 1020 alt 2 hd 128 sec 32>
/pci@0,0/pci15ad,1976@10/sd@3,0
4. c1t4d0 <drive type unknown>
/pci@0,0/pci15ad,1976@10/sd@4,0
5. c1t5d0 <DEFAULT
cyl 1020 alt 2 hd 128 sec 32>
/pci@0,0/pci15ad,1976@10/sd@5,0
6. c1t6d0 <DEFAULT
cyl 1020 alt 2 hd 128 sec 32>
/pci@0,0/pci15ad,1976@10/sd@6,0
7. c1t8d0 <DEFAULT
cyl 1020 alt 2 hd 128 sec 32>
/pci@0,0/pci15ad,1976@10/sd@8,0
Specify disk (enter its number): ^C
Then rebooted the system…
root@sol-test-2:>/# metastat d9
d9: RAID
State: Okay
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
Original device:
Size: 8338752 blocks (4.0
GB)
Device Start Block Dbase
State Reloc Hot Spare
c1t3d0s0 4426 No Okay
Yes
c1t4d0s0 4426 No Okay
Yes c1t6d0s0
c1t5d0s0 4426 No Okay
Yes
root@sol-test-2:>/# cd /raidtest/
root@sol-test-2:>/raidtest# ls
f1 f2 lost+found
SO… it’s working?
Check yourself………
root@sol-test-2:>/# metastat d9
d9: RAID
State: Okay
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
Original device:
Size: 8338752 blocks (4.0
GB)
Device Start Block Dbase
State Reloc Hot Spare
c1t3d0s0 4426 No Okay
Yes
c1t4d0s0 4426 No Okay
Yes c1t6d0s0
c1t5d0s0 4426 No Okay
Yes c1t8d0s0
root@sol-test-2:>/# ls -l /raidtest/
total 409872
-rw------T 1 root root
104857600 Oct 2 05:58 f1
-rw------T 1 root root
104857600 Oct 2 05:59 f2
drwx------ 2 root root
8192 Oct 2 05:56 lost+found
OK…
Now I had attached both disks again
c1t4d0
c1t5d0
Now get back the hotspares,
root@sol-test-2:>/# metareplace -e d9 c1t4d0s0
d9: device c1t4d0s0 is enabled
root@sol-test-2:>/# metareplace -e d9 c1t5d0s0
metareplace: sol-test-2: d9: resync in progress
*[metareplace will replace the faulty disk with new one and –e will
tell to replace it at the same location
---- metareplace automatically starts resynchronizing the new component withthe
rest of the RAID 5 volume.]
root@sol-test-2:>/# metastat d9
d9: RAID
State: Resyncing
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
Original device:
Size: 8338752 blocks (4.0
GB)
Device Start Block Dbase
State Reloc Hot Spare
c1t3d0s0 4426 No Okay
Yes
c1t4d0s0 4426 No
Resyncing Yes c1t6d0s0
c1t5d0s0 4426 No Okay
Yes c1t8d0s0
root@sol-test-2:>/# metastat d9
d9: RAID
State: Okay
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
Original device:
Size: 8338752 blocks (4.0
GB)
Device Start Block Dbase
State Reloc Hot Spare
c1t3d0s0 4426 No Okay
Yes
c1t4d0s0 4426 No Okay
Yes c1t6d0s0
c1t5d0s0 4426 No Okay
Yes c1t8d0s0
root@sol-test-2:>/# metareplace -e d9 c1t5d0s0
d9: device c1t5d0s0 is enabled
root@sol-test-2:>/# metastat d9
d9: RAID
State: Resyncing
Hot spare pool: hsp009
Interlace: 32 blocks
Size: 8335360 blocks (4.0
GB)
Original device:
Size: 8338752 blocks (4.0
GB)
Device Start Block Dbase
State Reloc Hot Spare
c1t3d0s0 4426 No Okay
Yes
c1t4d0s0 4426 No Okay
Yes c1t6d0s0
c1t5d0s0 4426 No
Resyncing Yes c1t8d0s0
we can see the status of our HS’s
root@sol-test-2:>/# metastat hsp009
hsp009: 2 hot spares
Device Status
Length Reloc
c1t6d0s0 In use
4173824 blocks Yes
c1t8d0s0 In use
4173824 blocks Yes
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