You can't just say D2D. If it's the same disk sub-system, your times will degrade considerably because you will be doing reads and writes at the same time. I can push 2TB to an LTO3 tape loader in about 10 hours. BE tells me that's 15GB/min, but in reality it's more like 3.1GB/min.
I recently bought an MD1000 from dell along with their Perc6 card and loaded half the array with Seagate 450GB SAS http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=st3450856ss-chta -15k.6-sas-450gb-hd&vgnextoid=056446f89a8c8110VgnVCM100000f5ee0a0aRCRD&v gnextchannel=ef458987a7574110VgnVCM100000f5ee0a0aRCRD&reqPage=Model and the other half with Seagate 1TB SATA's http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=barracuda-es-2-s ata-3-0-gb/s-1-tb-hard-drive&vgnextoid=481e83de34b43110VgnVCM100000f5ee0 a0aRCRD&vgnextchannel=b655f141e7f43110VgnVCM100000f5ee0a0aRCRD&reqPage=M odel Make sure your math sticks with either bits or Bytes! LSI has a SAS card that can supposedly reach 1.5GB/sec or 90GB/min!?! A 1Gb NIC card can hit roughly 7.5GB/min Controller card cache size, write-back/write-through all play a part. Firmware, CPU, software used for the backup. Backup to tape is written differently than to disk. I pull data from other servers over the network to a DLT drive and I get about 575MB/min. A one shot backup of just my exchange server over the network to the DLT yeilds about 950MB/min. A nightly differential of my SAS drives to the LTO3, that runs at about 400MB/min, because the data is not sequential on the drives. HTH, and someone please check my math. I've only had 1 cup of coffee this morning. Thanks, Jake Gardner TTC Network Administrator Ext. 246 -----Original Message----- From: Chinnery, Paul [mailto:[EMAIL PROTECTED] Sent: Friday, November 14, 2008 10:18 AM To: NT System Admin Issues Subject: RE: tape/disk speed I'd say you definitely have an issue with backup to disk. We do the same thing (however, it's a SAN to SAN backup) it is considerably faster than tape. Paul Chinnery Network Administrator Memorial Medical Center 231-845-2319 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Friday, November 14, 2008 10:13 AM To: NT System Admin Issues Subject: tape/disk speed I've been doing backup to disk backups and backup to tape backups for a long time. I've always liked backup to disk because restores can occur so much quicker when restoring a single file or two. However, the other day I was doing some testing and found that my backup to tape backups are a LOT faster than disk. Backing up 25GB of data to tape (LTO3) takes me about 25 minutes at 2,855MB/min. Backing up the same 25GB of data to disk takes about 2 hours at 460MB/min. Is this what most others are seeing, or is my disk backups just performing slow? -------------------------------------------------------------------- mail2web.com - Enhanced email for the mobile individual based on Microsoft(r) Exchange - http://link.mail2web.com/Personal/EnhancedEmail ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ***Teletronics Technology Corporation*** This e-mail is confidential and may also be privileged. If you are not the addressee or authorized by the addressee to receive this e-mail, you may not disclose, copy, distribute, or use this e-mail. If you have received this e-mail in error, please notify the sender immediately by reply e-mail or by telephone at 267-352-2020 and destroy this message and any copies. Thank you. ******************************************************************* ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
