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Operating Systems Solaris Thoughts/experiences of SAN attaching V880 to EMC SAN Post 302108259 by si_linux on Sunday 25th of February 2007 03:40:22 PM
Old 02-25-2007
Thoughts/experiences of SAN attaching V880 to EMC SAN

Hi everyone,

I wonder if I can canvas any opinions or thoughts (good or bad) on SAN attaching a SUN V880/490 to an EMC Clarion SAN?

At the moment the 880 is using 12 internal FC-AL disks as a db server and seems to be doing a pretty good job. It is not I/O, CPU or Memory constrained and the internal disks are mirrored in a RAID 0+1 configuration.

I have 2 choices to make as we intend to increase the number of db's running on the machine(s) - these options are:

1 - To directely attach the servers to the EMC SAN with FC HBA's.

2 - To purchase StoredgeTek SCSI shelves and use SVM to manage the disks (FCAL is overkill to be honest).

I know there are all sorts of ways the SAN can stripe and chop up the disks to allow for RAID 5 etc and that SVM will make a pretty good job of doing the same on the SCSI shelves.

However I do not know if there are any significant technical advantages/disadvantages for either of these two methods.

Does anyone have any thoughts on this?

My own concerns are the reliability of the connection to the SAN as apposed to directly attaching the SCSI shelves. I feel keeping the SUN kit self-contained may be preferable in the long run.

Appreciate the time taken to read and reply.

Si
 

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SCSI(7) 						 Miscellaneous Information Manual						   SCSI(7)

NAME
SCSI, RAID - Small Computer System Interface SYNOPSIS
dsk#, tape#_d#, cdrom# DESCRIPTION
The operating system interfaces to disk and tape devices through the Small Computer System Interface (SCSI). SCSI support is limited to the Compaq-supplied storage devices and certain third-party devices. To determine which named devices are supported in the default system, refer to the file /etc/ddr.dbase. For example, the following devices are listed therein: Winchester disks: RZ24L, RZ25, RZ25L, RZ25M, RZ28M, RZ29B, RZ55, RZ56, RZ58, RZ73, RZ74, RX23, RX26, RX33, IOMEGA ZIP, RAID (Redundant Arrays of Independent Disks) SCSI controllers: HSZ10, HSZ40, HSZ80 Magnetic tapes: TZ30, TZK11, TLZ06, TKZ09, TKZ60, DLT8000, SDT-10000 Media Changers: TL800, ESL9000 Optical disks: RRD42, RRD43, RRD44 Vendors can add their own devices to ddr.dbase. Refer to the Software Product Description (SPD) for a given release of the operating system for more information on processor-specific device support. Under the operating system, a SCSI device is referred to by a device identifier that is assigned by the operating system. This name has no relationship to the descriptive name of the device, although in previous releases of the operating system disks such as the RZ74 mapped to a system-assigned rz# logical name (where # was the instance number of that disk. Current logical names for SCSI disks and tapes take the forms specified in the rz(8) and tz(7) reference pages, such as dsk? and tape?. Refer to the dsfmgr(8) reference page for the naming conventions for disks, tapes and other devices, such as CD-ROM readers. Refer to the hwmgr(8) reference page for information on determining device names and other device data. SCSI Device Limits The number of possible target device IDs is determined by the controller type and method of connection, such as a multibus connection using fibre channel. Refer to the emx(7) reference page for an example of device addressing. Device Special Files The dsfmgr command creates device special files for all the devices that are attached to SCSI controllers. This event occurs automatically on system startup, and no administrative intervention is required unless an event requires that a device be renamed or its I/O be reas- signed. In such cases, you can use dsfmgr and hwmgr to manage SCSI devices and their associated device special files without the need to calculate values from their Bus, Target ID, and LUN data. RESTRICTIONS
The SCSI device driver is not warrantied to operate with optical disks other than the devices listed in /etc/ddr.dbase/. The SCSI driver attempts to support, on a best-effort basis, disks and magnetic tapes supplied by other vendors. The following notes apply to the driver's handling of disks from other vendors: These disks are identified using the following command: # hwmgr -get attribute -a name This command will return the device name SCSI-WWID (World-Wide Identifier) for all devices on the system, which includes the model name of the device. You can filter the output by specifying categories of devices. Disks are assigned a default partition table. The default table can be modified by editing the ccmn_rzxx_sizes[8] entry in the /usr/sys/data/cam_data.c file. The disklabel command can also be used to modify the partition table on an RZxx disk. RELATED INFORMATION
atapi_ide(7), dsfmgr(8), emx(7), hwmgr(8), rz(7), tz(7), disklabel(8), ddr.dbase(4) delim off SCSI(7)

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