SATA does not do Read's Writes's at the same time well (ie Migration or backup Stgpool with Backup client session at the same time... It can be done, but careful concideration is taken when the SATA Disk Frame is carved up... (ie striped accross Drawers, small raid groups etc) The easiest is a Tier 2 FC frame ...
Charles Hart "Allen S. Rout" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[email protected]> 07/12/2007 09:19 AM Please respond to "ADSM: Dist Stor Manager" <[email protected]> To [email protected] cc Subject Re: [ADSM-L] SATA disk? >> On Thu, 12 Jul 2007 07:32:27 -0500, Andy Huebner <[EMAIL PROTECTED]> said: > To me it is not the incoming, but the outgoing that is the greatest > concern. If the next pool is physical tape, be sure you have enough > speed to keep up with your tape drives. If the disks cannot keep up > with the physical tape drives then performance will not be acceptable. > Since many VTLs use ATA disks we know it can be done. This is a really good point. Keeping the number of read streams under control will make a huge difference in your performance. When I drain a SATA pool with a single thread, I can drive one of my 3592s at 80-90 MB/s. When I put three of them on the job, aggregate throughput drops to ~30 MB/s (yes, each drive getting ~10MB/s). - Allen S. Rout This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. If you have received this e-mail in error, please notify the sender by replying to this message and delete this e-mail immediately.
