Re: [PERFORM] SATA RAID: Promise vs. 3ware
At 02:08 PM 3/20/2007, Dave Cramer wrote: On 20-Mar-07, at 1:53 PM, Benjamin Arai wrote: This is a little biased but I would stay away from areca only because they have fans on the card. At some point down the line that card is going to die. When it does there is really no telling what it will do to your data. Ummm ?what? fan? The Intel IOP341 (AKA 81341) based ARC-12xx cards are what people are most likely going to want to buy at this point, and they are fanless: http://www.areca.us/support/photo_gallery.htm The "lore" is that +3ware is best at random IO and Areca is best at streaming IO. OLTP => 3ware. OLAP => Areca. - stay away from Adaptec or Promise for any mission critical role. = LSI is a mixed bag. Well, they are also the only one of the bunch that I am aware of that will sell you 1G of cache. Actually, it's up to 2GB of BB cache... 2GB DDR2 SDRAMs are cheap and easy to get now. I've actually been agitating for Areca to support 4GB of RAM. Plus if you use battery backup sooner or later you have to replace the batteries. I use areca all the time and I've never had a fan die, but I admit it is a point of failure. I've had the whole card die (massive cooling failure in NOC led to ...), but never any component on the card. OTOH, I'm conservative about how much heat per unit area I'm willing to allow to occur in or near my DB servers. Cheers, Ron ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [PERFORM] SATA RAID: Promise vs. 3ware
On 20-Mar-07, at 1:53 PM, Benjamin Arai wrote: This is a little biased but I would stay away from areca only because they have fans on the card. At some point down the line that card is going to die. When it does there is really no telling what it will do to your data. I personally use 3Ware cards, they work well but I have had one die before (1/10). Well, they are also the only one of the bunch that I am aware of that will sell you 1G of cache. Plus if you use battery backup sooner or later you have to replace the batteries. I use areca all the time and I've never had a fan die, but I admit it is a point of failure. Dave ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [PERFORM] SATA RAID: Promise vs. 3ware
On 20-Mar-07, at 9:23 AM, Ireneusz Pluta wrote: Hello all, I sent a similar post to a FreeBSD group, but thought I'd might try here too. I am completing a box for PostgreSQL server on FreeBSD. Selecting a RAID controller I decided to go with 3ware SE9650-16, following good opinions about 3ware controllers found on FreeBSD and PostgreSQL groups. However my dealer suggest me not to go with 3ware, and take Promise SuperTrak EX16350, instead. This suggestion does not have any technical background and it comes generally from the fact of limited availability of 16x 3ware controllers on the local market and immediate availability of Promise. Is this technically a good idea to take Promise instead of 3ware or rather I definitely should insist on 3ware and wait for it? The reality is that most dealers have no idea what is "good" for a database application. It is likely that this card is better for him somehow ( more margin, easier to get, etc.) I'd stick with 3ware, areca, or lsi. And even then I'd check it when I got it to make sure it lived up to it's reputation. Dave Thank you Ireneusz Pluta ---(end of broadcast)--- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [PERFORM] SATA RAID: Promise vs. 3ware
> Is this technically a good idea to take Promise instead of 3ware or > rather I definitely should insist on 3ware and wait for it? Use 3Ware they are proven to provide a decent raid controller for SATA/PATA. Promise on the other hand... not so much. Joshua D. Drake > > Thank you > > Ireneusz Pluta > > > ---(end of broadcast)--- > TIP 7: You can help support the PostgreSQL project by donating at > >http://www.postgresql.org/about/donate > -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL Replication: http://www.commandprompt.com/products/ ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [PERFORM] SATA RAID: Promise vs. 3ware
On Tue, Mar 20, 2007 at 10:18:45AM -0400, Merlin Moncure wrote: > On 3/20/07, Ireneusz Pluta <[EMAIL PROTECTED]> wrote: > >Hello all, > > > >I sent a similar post to a FreeBSD group, but thought I'd might try here > >too. > > > >I am completing a box for PostgreSQL server on FreeBSD. Selecting a RAID > >controller I decided to go > >with 3ware SE9650-16, following good opinions about 3ware controllers > >found on FreeBSD and > >PostgreSQL groups. > > > >However my dealer suggest me not to go with 3ware, and take Promise > >SuperTrak EX16350, instead. This > >suggestion does not have any technical background and it comes generally > >from the fact of limited > >availability of 16x 3ware controllers on the local market and immediate > >availability of Promise. > > > >Is this technically a good idea to take Promise instead of 3ware or rather > >I definitely should > >insist on 3ware and wait for it? > > > Promise raid controllers are famous for being software based with all > the real work being done in the driver. Without doing the research > this may or may not be the case with this particular controller. > Another issue with cheap RAID controllers is the performance may not > be as good as software raid...in fact it may be worse. Look for > benchmarks on the web and be skeptical. A Promise RAID is the only hardware RAID I've ever had eat an entire array for me... Granted this was one of those "external array with SCSI to the host", but it's certainly turned me away from Promise.. Probably not related to the controller in question, just their general quality level. //Magnus ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [PERFORM] SATA RAID: Promise vs. 3ware
On 3/20/07, Ireneusz Pluta <[EMAIL PROTECTED]> wrote: Hello all, I sent a similar post to a FreeBSD group, but thought I'd might try here too. I am completing a box for PostgreSQL server on FreeBSD. Selecting a RAID controller I decided to go with 3ware SE9650-16, following good opinions about 3ware controllers found on FreeBSD and PostgreSQL groups. However my dealer suggest me not to go with 3ware, and take Promise SuperTrak EX16350, instead. This suggestion does not have any technical background and it comes generally from the fact of limited availability of 16x 3ware controllers on the local market and immediate availability of Promise. Is this technically a good idea to take Promise instead of 3ware or rather I definitely should insist on 3ware and wait for it? Promise raid controllers are famous for being software based with all the real work being done in the driver. Without doing the research this may or may not be the case with this particular controller. Another issue with cheap RAID controllers is the performance may not be as good as software raid...in fact it may be worse. Look for benchmarks on the web and be skeptical. merlin ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[PERFORM] SATA RAID: Promise vs. 3ware
Hello all, I sent a similar post to a FreeBSD group, but thought I'd might try here too. I am completing a box for PostgreSQL server on FreeBSD. Selecting a RAID controller I decided to go with 3ware SE9650-16, following good opinions about 3ware controllers found on FreeBSD and PostgreSQL groups. However my dealer suggest me not to go with 3ware, and take Promise SuperTrak EX16350, instead. This suggestion does not have any technical background and it comes generally from the fact of limited availability of 16x 3ware controllers on the local market and immediate availability of Promise. Is this technically a good idea to take Promise instead of 3ware or rather I definitely should insist on 3ware and wait for it? Thank you Ireneusz Pluta ---(end of broadcast)--- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
