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seen Jun 18 '13 at 22:05

sysadmin for Exchange 2k7, Active Directory 2k3, VMware ESXi clusters, Windows Server 2008 R2


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revised HP Compaq 8200 Elite SFF won't boot from USB drive
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answered HP Compaq 8200 Elite SFF won't boot from USB drive
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comment HP Compaq 8200 Elite SFF won't boot from USB drive
Have done some more testing, will post the results as an answer to this question, but can't do this until tomorrow as I don't have a good enough ServerFault reputation yet!
Jan
24
comment HP Compaq 8200 Elite SFF won't boot from USB drive
Sorry, I'm old and refer to everything as BIOS - I should know better. I tried disabling the EFI boot sources, but the USB still didn't show up in the F9 boot menu. I went back in and faffed around disabling and re-enabling various things, and at some point, it worked! Not entirely sure what made it work, but appears to be something to do with disabling the EFI boot sources. Thanks very much!
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24
accepted HP Compaq 8200 Elite SFF won't boot from USB drive
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24
asked HP Compaq 8200 Elite SFF won't boot from USB drive
Jan
23
comment RAID10 volume write latency on Windows on ESXi 5
Thanks for the reply! The SAN has dual controllers, have tried swapping each volume between them, no discernible difference. Cabling between servers & Brocade switches is ruled out as we're dealing with internal wiring in a chassis, and it doesn't appear to matter which of two different chassis I use. Currently looking into MPIO to see if that makes a difference. Also gathering data from all the test volumes to send to Fujitsu.
Jan
23
comment RAID10 volume write latency on Windows on ESXi 5
Thanks for the comprehensive answer! 1. All the new volumes created for testing have their disks on one shelf each, i.e. no one volume has disks across multiple shelves. 2. Haven't tried this with a non-VMware host, will have to do so. 3. All servers are blades, the chassis (2 separate chassis for the servers involved) have dual Brocade switches & the servers have dual HBAs 4. My thoughts exactly! 5. Will look into this. 6. Currently talking with Fujitsu, I too hoped there was a stupidly obvious bit of config I'd missed. 7. Yes.
Jan
19
comment RAID10 volume write latency on Windows on ESXi 5
The RAID10 volume is over two shelves (the controller shelf and a disk shelf). There are some very basic cache settings, which can be altered per LUN - currently talking to the hardware vendor about these. I've now created separate RAID0, RAID1, and RAID5 volumes, and all seem to perform equally poorly. The original RAID5 still performs perfectly.
Jan
16
comment RAID10 volume write latency on Windows on ESXi 5
Thanks Eric, and yes, RAID 10 should perform better, that's why it's been configured that way. The RAID 5 and RAID 10 volumes are both running off the same controller in this case. The RAID 10 is the minimum it can be in terms of spindles (4). The RAID 5 volume is across 12 spindles. The RAID 10 is only being accessed by two servers; the RAID 5 contains all the c:/ drives for multiple VMs.