Mag Gam wrote:
No, not trolling Tom. I am faily new to Linux, and was wondering how
can I verify if my Linux host is connected to a SAN? I want to know if
my disks (sfdisk -l) are local or attached to external storage (ie,
SAN). Also, how would I figure out parent and children relationships
between devices, especially HBA and their disks.
from the OS's perspective, there's not much difference between a 'SAN'
disk and a direct connect disk other than the interface type. a
fiberchannel SAN vs a fiberchannel direct connect RAID differs only in
that the fiberchannel SAN may be servicing multiple computers while the
fiberchannel direct connect raid is only servicing this one system.
now, some folks consider any FC device to be SAN. Having used
directly connectted fiberchannel raid on Unix systems, I don't hold to this.
cat /proc/scsi/scsi will give you some info on what sort of stuff the
SCSI system sees.
one system...
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: COMPAQ Model: MSA1000 Rev: 4.32
Type: RAID ANSI SCSI revision: 04
Host: scsi0 Channel: 00 Id: 00 Lun: 01
Vendor: COMPAQ Model: MSA1000 VOLUME Rev: 4.32
Type: Direct-Access ANSI SCSI revision: 04
Host: scsi0 Channel: 00 Id: 00 Lun: 02
Vendor: COMPAQ Model: MSA1000 VOLUME Rev: 4.32
Type: Direct-Access ANSI SCSI revision: 04
Host: scsi0 Channel: 00 Id: 00 Lun: 03
Vendor: COMPAQ Model: MSA1000 VOLUME Rev: 4.32
Type: Direct-Access ANSI SCSI revision: 04
Host: scsi0 Channel: 00 Id: 00 Lun: 07
Vendor: COMPAQ Model: MSA1000 VOLUME Rev: 4.32
Type: Direct-Access
the HP MSA1000 could be used as a SAN or as a directly connected
external RAID, the host simply can't see this without invoking MSA1000
specific configuration software.
on another system...
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IBM-ESXS Model: ST936701LC FN Rev: B41D
Type: Direct-Access ANSI SCSI revision: 04
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: SUN Model: StorEdge 3510 Rev: 415F
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 00 Id: 01 Lun: 00
Vendor: SUN Model: StorEdge 3510 Rev: 415F
Type: Enclosure ANSI SCSI revision: 03
scsi0 is a directly connected SCSI disk. scsi1 is a logical unit on a
Sun StorEdge 3510FC, which is another barely-a-SAN storage controller.
The same thing applies, the only way I could tell this is a SAN would be
to know that in fact there's a fiber switch (Qlogic SANbox) between the
host (an IBM bladecenter HS20) and the 3510FC, and that there are other
systems connected to the same 3510FC and using other volumes on it.
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